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• Random Page Cost and Planning

  - by Dave Jarvis

  A query (see below) that extracts climate data from weather stations within a given radius of a city using the dates for which those weather stations actually have data. The query uses the table's only index, rather effectively: CREATE UNIQUE INDEX measurement_001_stc_idx ON climate.measurement_001 USING btree (station_id, taken, category_id); Reducing the server's configuration value for random_page_cost from 2.0 to 1.1 had a massive performance improvement for the given range (nearly an order of magnitude) because it suggested to PostgreSQL that it should use the index. While the results now return in 5 seconds (down from ~85 seconds), problematic lines remain. Bumping the query's end date by a single year causes a full table scan: sc.taken_start >= '1900-01-01'::date AND sc.taken_end <= '1997-12-31'::date AND How do I persuade PostgreSQL to use the indexes regardless of years between the two dates? (A full table scan against 43 million rows is probably not the best plan.) Find the EXPLAIN ANALYSE results below the query. Thank you! Query SELECT extract(YEAR FROM m.taken) AS year, avg(m.amount) AS amount FROM climate.city c, climate.station s, climate.station_category sc, climate.measurement m WHERE c.id = 5182 AND earth_distance( ll_to_earth(c.latitude_decimal,c.longitude_decimal), ll_to_earth(s.latitude_decimal,s.longitude_decimal)) / 1000 <= 30 AND s.elevation BETWEEN 0 AND 3000 AND s.applicable = TRUE AND sc.station_id = s.id AND sc.category_id = 1 AND sc.taken_start >= '1900-01-01'::date AND sc.taken_end <= '1996-12-31'::date AND m.station_id = s.id AND m.taken BETWEEN sc.taken_start AND sc.taken_end AND m.category_id = sc.category_id GROUP BY extract(YEAR FROM m.taken) ORDER BY extract(YEAR FROM m.taken) 1900 to 1996: Index "Sort (cost=1348597.71..1348598.21 rows=200 width=12) (actual time=2268.929..2268.935 rows=92 loops=1)" " Sort Key: (date_part('year'::text, (m.taken)::timestamp without time zone))" " Sort Method: quicksort Memory: 32kB" " -> HashAggregate (cost=1348586.56..1348590.06 rows=200 width=12) (actual time=2268.829..2268.886 rows=92 loops=1)" " -> Nested Loop (cost=0.00..1344864.01 rows=744510 width=12) (actual time=0.807..2084.206 rows=134893 loops=1)" " Join Filter: ((m.taken >= sc.taken_start) AND (m.taken <= sc.taken_end) AND (sc.station_id = m.station_id))" " -> Nested Loop (cost=0.00..12755.07 rows=1220 width=18) (actual time=0.502..521.937 rows=23 loops=1)" " Join Filter: ((sec_to_gc(cube_distance((ll_to_earth((c.latitude_decimal)::double precision, (c.longitude_decimal)::double precision))::cube, (ll_to_earth((s.latitude_decimal)::double precision, (s.longitude_decimal)::double precision))::cube)) / 1000::double precision) <= 30::double precision)" " -> Index Scan using city_pkey1 on city c (cost=0.00..2.47 rows=1 width=16) (actual time=0.014..0.015 rows=1 loops=1)" " Index Cond: (id = 5182)" " -> Nested Loop (cost=0.00..9907.73 rows=3659 width=34) (actual time=0.014..28.937 rows=3458 loops=1)" " -> Seq Scan on station_category sc (cost=0.00..970.20 rows=3659 width=14) (actual time=0.008..10.947 rows=3458 loops=1)" " Filter: ((taken_start >= '1900-01-01'::date) AND (taken_end <= '1996-12-31'::date) AND (category_id = 1))" " -> Index Scan using station_pkey1 on station s (cost=0.00..2.43 rows=1 width=20) (actual time=0.004..0.004 rows=1 loops=3458)" " Index Cond: (s.id = sc.station_id)" " Filter: (s.applicable AND (s.elevation >= 0) AND (s.elevation <= 3000))" " -> Append (cost=0.00..1072.27 rows=947 width=18) (actual time=6.996..63.199 rows=5865 loops=23)" " -> Seq Scan on measurement m (cost=0.00..25.00 rows=6 width=22) (actual time=0.000..0.000 rows=0 loops=23)" " Filter: (m.category_id = 1)" " -> Bitmap Heap Scan on measurement_001 m (cost=20.79..1047.27 rows=941 width=18) (actual time=6.995..62.390 rows=5865 loops=23)" " Recheck Cond: ((m.station_id = sc.station_id) AND (m.taken >= sc.taken_start) AND (m.taken <= sc.taken_end) AND (m.category_id = 1))" " -> Bitmap Index Scan on measurement_001_stc_idx (cost=0.00..20.55 rows=941 width=0) (actual time=5.775..5.775 rows=5865 loops=23)" " Index Cond: ((m.station_id = sc.station_id) AND (m.taken >= sc.taken_start) AND (m.taken <= sc.taken_end) AND (m.category_id = 1))" "Total runtime: 2269.264 ms" 1900 to 1997: Full Table Scan "Sort (cost=1370192.26..1370192.76 rows=200 width=12) (actual time=86165.797..86165.809 rows=94 loops=1)" " Sort Key: (date_part('year'::text, (m.taken)::timestamp without time zone))" " Sort Method: quicksort Memory: 32kB" " -> HashAggregate (cost=1370181.12..1370184.62 rows=200 width=12) (actual time=86165.654..86165.736 rows=94 loops=1)" " -> Hash Join (cost=4293.60..1366355.81 rows=765061 width=12) (actual time=534.786..85920.007 rows=139721 loops=1)" " Hash Cond: (m.station_id = sc.station_id)" " Join Filter: ((m.taken >= sc.taken_start) AND (m.taken <= sc.taken_end))" " -> Append (cost=0.00..867005.80 rows=43670150 width=18) (actual time=0.009..79202.329 rows=43670079 loops=1)" " -> Seq Scan on measurement m (cost=0.00..25.00 rows=6 width=22) (actual time=0.001..0.001 rows=0 loops=1)" " Filter: (category_id = 1)" " -> Seq Scan on measurement_001 m (cost=0.00..866980.80 rows=43670144 width=18) (actual time=0.008..73312.008 rows=43670079 loops=1)" " Filter: (category_id = 1)" " -> Hash (cost=4277.93..4277.93 rows=1253 width=18) (actual time=534.704..534.704 rows=25 loops=1)" " -> Nested Loop (cost=847.87..4277.93 rows=1253 width=18) (actual time=415.837..534.682 rows=25 loops=1)" " Join Filter: ((sec_to_gc(cube_distance((ll_to_earth((c.latitude_decimal)::double precision, (c.longitude_decimal)::double precision))::cube, (ll_to_earth((s.latitude_decimal)::double precision, (s.longitude_decimal)::double precision))::cube)) / 1000::double precision) <= 30::double precision)" " -> Index Scan using city_pkey1 on city c (cost=0.00..2.47 rows=1 width=16) (actual time=0.012..0.014 rows=1 loops=1)" " Index Cond: (id = 5182)" " -> Hash Join (cost=847.87..1352.07 rows=3760 width=34) (actual time=6.427..35.107 rows=3552 loops=1)" " Hash Cond: (s.id = sc.station_id)" " -> Seq Scan on station s (cost=0.00..367.25 rows=7948 width=20) (actual time=0.004..23.529 rows=7949 loops=1)" " Filter: (applicable AND (elevation >= 0) AND (elevation <= 3000))" " -> Hash (cost=800.87..800.87 rows=3760 width=14) (actual time=6.416..6.416 rows=3552 loops=1)" " -> Bitmap Heap Scan on station_category sc (cost=430.29..800.87 rows=3760 width=14) (actual time=2.316..5.353 rows=3552 loops=1)" " Recheck Cond: (category_id = 1)" " Filter: ((taken_start >= '1900-01-01'::date) AND (taken_end <= '1997-12-31'::date))" " -> Bitmap Index Scan on station_category_station_category_idx (cost=0.00..429.35 rows=6376 width=0) (actual time=2.268..2.268 rows=6339 loops=1)" " Index Cond: (category_id = 1)" "Total runtime: 86165.936 ms"

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• Why unsigned int contained negative number

  - by Daziplqa

  Hi All, I am new to C, What I know about unsigned numerics (unsigned short, int and longs), that It contains positive numbers only, but the following simple program successfully assigned a negative number to an unsigned int: 1 /* 2 * ===================================================================================== 3 * 4 * Filename: prog4.c 5 * 6 * ===================================================================================== 7 */ 8 9 #include <stdio.h> 10 11 int main(void){ 12 13 int v1 =0, v2=0; 14 unsigned int sum; 15 16 v1 = 10; 17 v2 = 20; 18 19 sum = v1 - v2; 20 21 printf("The subtraction of %i from %i is %i \n" , v1, v2, sum); 22 23 return 0; 24 } The output is : The subtraction of 10 from 20 is -10

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• simpledateformat parsing date with 'Z' literal

  - by DanInDC

  I am trying to parse a date that looks like this: 2010-04-05T17:16:00Z This is a valid date per http://www.ietf.org/rfc/rfc3339.txt. The 'Z' literal "imply that UTC is the preferred reference point for the specified time." If I try to parse it using SimpleDateFormat and this pattern: yyyy-MM-dd'T'HH:mm:ss It will be parsed as a Mon Apr 05 17:16:00 EDT 2010 SimpleDateFormat is unable to parse the string with these patterns: yyyy-MM-dd'T'HH:mm:ssz yyyy-MM-dd'T'HH:mm:ssZ I can explicitly set the TimeZone to use on the SimpleDateFormat to get the expected output, but I don't think that should be necessary. Is there something I am missing? Is there an alternative date parser?

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• What is an s2k algorithm?

  - by WilliamKF

  What is the definition of an s2k algorithm? For example, "PBKDF2(SHA-1)" is an s2k algorithm. Here is some Botan code that refers to s2k: AutoSeeded_RNG rng; std::auto_ptr<S2K> s2k(get_s2k("PBKDF2(SHA-1)")); s2k->set_iterations(8192); s2k->new_random_salt(rng, 8); SymmetricKey bc_key = s2k->derive_key(key_len, "BLK" + passphrase); InitializationVector iv = s2k->derive_key(iv_len, "IVL" + passphrase); SymmetricKey mac_key = s2k->derive_key(16, "MAC" + passphrase); Also, what is a 'salt' in s2k?

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• BinaryFormatter with MemoryStream Question

  - by Changeling

  I am testing BinaryFormatter to see how it will work for me and I have a simple question: When using it with the string HELLO, and I convert the MemoryStream to an array, it gives me 29 dimensions, with five of them being the actual data towards the end of the dimensions: BinaryFormatter bf = new BinaryFormatter(); MemoryStream ms = new MemoryStream(); byte[] bytes; string originalData = "HELLO"; bf.Serialize(ms, originalData); ms.Seek(0, 0); bytes = ms.ToArray(); returns - bytes {Dimensions:[29]} byte[] [0] 0 byte [1] 1 byte [2] 0 byte [3] 0 byte [4] 0 byte [5] 255 byte [6] 255 byte [7] 255 byte [8] 255 byte [9] 1 byte [10] 0 byte [11] 0 byte [12] 0 byte [13] 0 byte [14] 0 byte [15] 0 byte [16] 0 byte [17] 6 byte [18] 1 byte [19] 0 byte [20] 0 byte [21] 0 byte [22] 5 byte [23] 72 byte [24] 69 byte [25] 76 byte [26] 76 byte [27] 79 byte [28] 11 byte Is there a way to only return the data encoded as bytes without all the extraneous information?

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• Excel VBA: importing CSV with dates as dd/mm/yyyy

  - by Michael Smith

  ello I understand this is a fairly common problem, but I'm yet to find a reliable solution. I have data in a csv file with the first column formatted dd/mm/yyyy. When I open it with Workbooks.OpenText it defaults to mm/dd/yyyy until it figures out that what it thinks is the month exceeds 12, then reverts to dd/mm/yyyy. This is my test code, which tries to force it as xlDMYFormat, and I've also tried the text format. I understand this problem only applies to *.csv files, not *.txt, but that isn't an acceptable solution. Option Base 1 Sub TestImport() Filename = "test.csv" Dim ColumnArray(1 To 1, 1 To 2) ColumnsDesired = Array(1) DataTypeArray = Array(xlDMYFormat) ' populate the array for fieldinfo For x = LBound(ColumnsDesired) To UBound(ColumnsDesired) ColumnArray(x, 1) = ColumnsDesired(x) ColumnArray(x, 2) = DataTypeArray(x) Next x Workbooks.OpenText Filename:=Filename, DataType:=xlDelimited, Comma:=True, FieldInfo:=ColumnArray End Sub test.csv contains: Date 11/03/2010 12/03/2010 13/03/2010 14/03/2010 15/03/2010 16/03/2010 17/03/2010 Thanks Michael

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• How can I encode four unsigned bytes (0-255) to a float and back again using HLSL?

  - by Statement

  Hello! I am facing a task where one of my hlsl shaders require multiple texture lookups per pixel. My 2d textures are fixed to 256*256, so two bytes should be sufficient to address any given texel given this constraint. My idea is then to put two xy-coordinates in each float, giving me eight xy-coordinates in pixel space when packed in a Vector4 format image. These eight coordinates are then used to sample another texture(s). The reason for doing this is to save graphics memory and an attempt to optimize processing time, since then I don't require multiple texture lookups. By the way: Does anyone know if encoding/decoding 16 bytes from/to 4 floats using 1 sampling is slower than 4 samplings with unencoded data?

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• setting library include paths in c++

  - by Drew

  Hi all, I just installed gd2 using mac ports (sudo install gd2), which installed libraries in the following places: /opt/local/include/gd.h /opt/local/lib/libgd.dylib (link) /opt/local/lib/libgd.la /opt/local/lib/libgd.a So when I create my c++ app I add '#include "gd.h"', which throws: main.cpp:4:16: error: gd.h: No such file or directory If I set gd.h as an absolute path (as above)(not a solution, but was curious), I am thrown: g++ -L/opt/local/include -L/opt/local/lib main.o Heatmap_Map.o Heatmap_Point.o -o heatmap Undefined symbols: "_gdImagePng", referenced from: _main in main.o "_gdImageLine", referenced from: _main in main.o "_gdImageColorAllocate", referenced from: _main in main.o _main in main.o "_gdImageDestroy", referenced from: _main in main.o "_gdImageCreate", referenced from: _main in main.o "_gdImageJpeg", referenced from: _main in main.o ld: symbol(s) not found So, I understand this means that ld can not find the libraries it needs (hence trying to give it hints with the "-L" values). So after giving g++ the -L hints and the absolute path in #include, I can get it to work, but I don't think I have to do this, how can I make g++/ld search int eh right places for the libraries? Drew J. Sonne.

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• Reading UDP Packets

  - by Thomas Mathiesen

  I am having some trouble dissecting a UDP packet. I am receiving the packets and storing the data and sender-address in variables 'data' and 'addr' with: data,addr = UDPSock.recvfrom(buf) This parses the data as a string, that I am now unable to turn into bytes. I know the structure of the datagram packet which is a total of 28 bytes, and that the data I am trying to get out is in bytes 17:28. I have tried doing this: mybytes = data[16:19] print struct.unpack('>I', mybytes) --> struct.error: unpack str size does not match format And this: response = (0, 0, data[16], data[17], 6) bytes = array('B', response[:-1]) print struct.unpack('>I', bytes) --> TypeError: Type not compatible with array type And this: print "\nData byte 17:", str.encode(data[17]) --> UnicodeEncodeError: 'ascii' codec can't encode character u'\xff' in position 0: ordinal not in range(128) And I am not sure what to try next. I am completely new to sockets and byte-conversions in Python, so any advice would be helpful :) Thanks, Thomas

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• Order by text and then by number

  - by Chaim Chaikin

  I have data like: Audio 1 File 10 Audio 2 Audio 3 File 11 Audio 13 Audio 22 File 20 Test 22 Audio 10 File 1 File 2 I need it order first by the text (i.e. Audio, File, Test) and then by number (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22 etc.) The problem is that sorting it returns something like this: Audio 1 Audio 10 Audio 13 Audio 2 Audio 22 Audio 3 File 1 File 10 File 11 File 2 File 20 Test 22 While the result I want is: Audio 1 Audio 2 Audio 3 Audio 10 Audio 13 Audio 22 File 1 File 2 File 10 File 11 File 20 Test 22 If they were just numbers (i.e. without the audio, file, test) then I could just sort numerically. However, how can I sort here first by text and then by number.

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• Linked Server related

  - by rmdussa

  I have two instances of SQL Server: Server1 (SQL Server 2008) Server2 (SQL Server 2005) I am executing a stored procedure from Server1 which references tables on Server2. It is working fine in my test environment: Server1 runs Vista SP2, SQL Server 2008; Server2 runs Windows XP SP2, SQL Server 2005. However, it is not working in the production environment: Server1 runs Vista SP1, SQL Server 2008; Server2 runs Windows XP SP2, SQL Server 2005. The error message I receive is: OLE DB provider "SQLNCLI10" for linked server "Server2" returned message "No transaction is active.". Msg 7391, Level 16, State 2, Line 21 The operation could not be performed because OLE DB provider "SQLNCLI10" for linked server "Server2" was unable to begin a distributed transaction.

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• WEB-INF/lib jars not found in JBoss 4.0.2 war deploy

  - by boongywoongy

  I have a simple web application (one jsp and one servlet) file that I've copied into jboss-4.0.2/server/default/deploy folder and it has successfully hot deployed as I can access the jsp page. However, when I invoke the servlet, I am getting a java.lan.NoClassDefFoundError. I suspect that the jars under the WEB-INF/lib directory within the war is not being picked up. The structure of my war is: META-INF --> MANIFEST.MF WEB-INF --> classes --> ...*.classes --> lib --> jcommon-1.0.16.jar jfreechart-1.0.13.jar servlet-api.jar index.jsp Anybody else have classloading issues in JBoss 4? Many thanks.

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• How to set an array to a list of values in VB.NET?

  - by IPX Ares

  I cannot figure out how to set an array to one of two sets of numbers (there will be more later), every way that I have tried throws some kind of error. I have tried to Dim the array inside the case statements, but then I cannot use the array in the For Each, which makes this worthless.... any ideas would be appreciated. Code: Dim HourArray() As Integer Select Case CurrentShapeRow(ROW_PERIOD) Case "ON", "2X16" HourArray = {6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21} Case "2X8", "5X8" HourArray = {0, 1, 2, 3, 4, 5, 22, 23} Case Else Throw New Exception(String.Format("Unhandled Period: {0}", CurrentShapeRow(ROW_PERIOD))) End Select For Each HourCount As Integer In HourArray() 'DO SOME STUFF HERE Next

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• TreeView Databinding

  - by Anu

  Hi,I want to add items in treeviewi n WPF.I have function as public void SetTree(string Title,int Boxtype,int BoxNo ) { sBoxType = "Group"; TreeList items = TreeList.Load(Title, sBoxType, BoxNo); DataContext = items; } XAML Code of TreeView: <TreeView Margin="16,275,18,312" x:Name="treeView1" ItemsSource="{Binding}" ItemTemplate="{StaticResource TreeItemTemplate}"> </TreeView> <DataTemplate x:Key="TreeItemTemplate"> <WrapPanel> <TextBlock Text="{Binding Path=Title}" /> <TextBlock Text="{Binding Path=Box}" /> </WrapPanel> </DataTemplate> Actually i wan to TreeView ot display lik +Group (header) Controllersgroup 5 (Child items). As multicolumn child items.But it dislay like Controllersgroup5

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• Large Scale VHDL modularization techniques

  - by oxinabox.ucc.asn.au

  I'm thinking about implimenting a 16 bit CPU in VHDL. A simplish CPU. ADD, MULS, NEG, BitShift, JUMP, Relitive Jump, BREQ, Relitive BREQ, i don't know somethign along these lines Probably all only working with 16bit operands. I might even cut it down and use only a single operand and a accumulator. With Some status regitsters, Carry, Zero, Neg (unless i use a Accumlator), I know how to design all the parts from logic gates, and plan to build them up from first priciples, So for my ALU I'll need to 'build' a ADDer, proably a Carry Look ahead, group adder, this adder it self is make up oa a couple of parts, wich are themselves made up of a couple of parts. Anyway, my problem is not the CPU design, or the VHDL (i know the language, more or less). It's how i should keep things organised. How should I use packages, How should I name my processes and port maps? (i've never seen the benifit of naming the port maps, or processes)

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• Most efficient way to check if a date falls between two dates?

  - by Dave Jarvis

  Given: Start Month & Start Day End Month & End Day Any Year What SQL statement results in TRUE if a date lands between the Start and End days? 1st example: Start Date = 11-22 End Date = 01-17 Year = 2009 Specific Date = 2010-01-14 TRUE 2nd example: Start Date = 11-22 End Date = 11-16 Year = 2009 Specific Date = 2010-11-20 FALSE 3rd example: Start Date = 02-25 End Date = 03-19 Year = 2004 Specific Date = 2004-02-29 TRUE I was thinking of using the MySQL functions datediff and sign plus a CASE condition to determine whether the year wraps, but it seems rather expensive. Am looking for a simple, efficient calculation. Update The problem is the end date cannot simply use the year. The year must be increased if the end month/day combination happens before the start date. The start date is easy: Start Date = date( concat_ws( '-', year, Start Month, Start Day ) The end date is not so simple. Thank you!

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• How to apply a patch

  - by Niroshan

  I have this patch code which i downloaded from a web article (Calling Matlab from Java). http://www.cs.virginia.edu/~whitehouse/matlab/JavaMatlab.html But I donot know how to apply it in my windowsXp running computer. What I'm trying to do is call Matlab script file from java. I have found the necessary source codes and every thing but this mater is holding be back. Any help is highly appreciated. Thank you. Here's the patch code. Index: MatlabControl.java =================================================================== RCS file: /cvsroot/tinyos/tinyos-1.x/tools/java/net/tinyos/matlab/MatlabControl.java,v retrieving revision 1.3 diff -u -r1.3 MatlabControl.java --- MatlabControl.java 31 Mar 2004 18:43:50 -0000 1.3 +++ MatlabControl.java 16 Aug 2004 20:36:51 -0000 @@ -214,7 +214,8 @@ matlab.evalConsoleOutput(command); }else{ - matlab.fevalConsoleOutput(command, args, 0, null); + // matlab.fevalConsoleOutput(command, args, 0, null); + matlab.fevalConsoleOutput(command, args); } } catch (Exception e) { System.out.println(e.toString());

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• how 2 use logmath twice in same form(sphinx4)

  - by Pradeep

  i have configured sphinx with netbeans and its wroking fine. but im using a button to do the process. but after it recognisers. i want to do the process again. but then it gives a error saying the "logmath instance is already present" and saying cannot open the microphone. can someone give me a solution. what i want to do is use speech recogntion in several times in the same form. till it gives the correct answer. please help me this is the error i get "Creating new instance of LogMath while another instance is already present 10:53:27.833 SEVERE microphone Can't open microphone line with format PCM_SIGNED 16000.0 Hz, 16 bit, mono, 2 bytes/frame, big-endian not supported."

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• Formatting datetime values returned in a SELECT..FOR XML statement

  - by TelJanini

  Consider the following table: Orders OrderId Date CustomerId 1000 2012-06-05 20:03:12.000 51 1001 2012-06-16 12:02:31.170 48 1002 2012-06-18 19:45:16.000 33 When I extract the Order data using FOR XML: SELECT OrderId AS 'Order/@Order-Id', Date AS 'Order/ShipDate', CustomerId AS 'Order/Customer' FROM Orders WHERE OrderId = 1000 FOR XML PATH ('') I get the following result: <Order Order-Id="1000"> <ShipDate>2010-02-20T16:03:12</ShipDate> <Customer>51</Customer> </Order> The problem is, the ShipDate value in the XML file needs to be in the format M/DD/YYYY H:mm:ss PM. How can I change the output of the ShipDate in the XML file to the desired format? Any help would be greatly appreciated!

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• Failed to fetch URL http://dl-ssl.google.com/android/repository/addons_list-1.xml, reason: Failure initializing default SSL context

  - by user1156220

  Launching the android SDK manager from the command line gets me this error and others like: Failed to fetch URL http://dl-ssl.google.com/android/repository/addons_list-1.xml, reason: Failure initializing default SSL context I've done plenty of searches and have forced http instead of https, created an androidtool.cfg file and added the line sdkman.force.http=true permisions for all files in ~/.android are rw r r. I'm calling android logged in as the owner of those files. I am not using a proxy and I have no anti virus running. I just installed fedora 16 and am not sure of any firewalls running by default. I suspect a permissions problem somewhere along the line. any ideas?

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• Custom view in ListView disappears while scrolling in Android

  - by troorl

  Hi. I wrote a simple custom view for rows in ListView. It works fine, but when I try to scroll the list, I see only white rows without content. And when scrolling is over, rows continue to show again. This is how I draw a custom view: @Override protected void onDraw(Canvas canvas) { if(poster != null) { canvas.drawBitmap(poster, padding, padding, paint); } canvas.drawText(title, 55 + padding, 16 + padding, paint); } Maybe I missed something? P.S. This is short screencast (400kb) http://dl.dropbox.com/u/190203/test.mpeg

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• How do I create a foreign key in SQL Server?

  - by mmattax

  I have never "hand coded" creation code for SQL Server and foreign key deceleration is seemingly different from SQL Server and Postgres...here is my sql so far: drop table exams; drop table question_bank; drop table anwser_bank; create table exams ( exam_id uniqueidentifier primary key, exam_name varchar(50), ); create table question_bank ( question_id uniqueidentifier primary key, question_exam_id uniqueidentifier not null, question_text varchar(1024) not null, question_point_value decimal, constraint question_exam_id foreign key references exams(exam_id) ); create table anwser_bank ( anwser_id uniqueidentifier primary key, anwser_question_id uniqueidentifier, anwser_text varchar(1024), anwser_is_correct bit ); when I run the query I get this error: Msg 8139, Level 16, State 0, Line 9 Number of referencing columns in foreign key differs from number of referenced columns, table 'question_bank'. Can you spot the error? thanks.

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• Simple javascript problem in ie6 and ie7

  - by Jeff Lamb

  I have a very simple function that takes a list of comma separated (x,y) points and imports them into a graph. I have FF, Chrome and IE8 installed. I use IETester to test for IE6 and IE7. // Import Data this.Import = function(data) { alert("Data in: "+data); var d; // Make sure the first and the last are start/ending parenthesis if ( (data[0] != '(') || (data[data.length-1] != ')') ) { alert("After if: "+data[0]+" "+data[data.length-1]); return false; } ... In Chrome, FF and IE8, I don't see the "After if:" alert. In IE6 and IE7, I see the following two alerts: Data in: (52,16),(100,90) After if: undefined undefined The "Data in" alert matches in all browsers. Any ideas?

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• JAXB marshals XML differently to OutputStream vs. StringWriter

  - by Andy

  I apologize if this has been answered, but the search terms I have been using (i.e. JAXB @XmlAttribute condensed or JAXB XML marshal to String different results) aren't coming up with anything. I am using JAXB to un/marshal objects annotated with @XmlElement and @XmlAttribute annotations. I have a formatter class which provides two methods -- one wraps the marshal method and accepts the object to marshal and an OutputStream, the other just accepts the object and returns the XML output as a String. Unfortunately, these methods do not provide the same output for the same objects. When marshaling to a file, simple object fields internally marked with @XmlAttribute are printed as: <element value="VALUE"></element> while when marshaling to a String, they are: <element value="VALUE"/> I would prefer the second format for both cases, but I am curious as to how to control the difference, and would settle for them being the same regardless. I even created one static marshaller that both methods use to eliminate different instance values. The formatting code follows: /** Marker interface for classes which are listed in jaxb.index */ public interface Marshalable {} /** Local exception class */ public class XMLMarshalException extends BaseException {} /** Class which un/marshals objects to XML */ public class XmlFormatter { private static Marshaller marshaller = null; private static Unmarshaller unmarshaller = null; static { try { JAXBContext context = JAXBContext.newInstance("path.to.package"); marshaller = context.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8"); unmarshaller = context.createUnmarshaller(); } catch (JAXBException e) { throw new RuntimeException("There was a problem creating a JAXBContext object for formatting the object to XML."); } } public void marshal(Marshalable obj, OutputStream os) throws XMLMarshalException { try { marshaller.marshal(obj, os); } catch (JAXBException jaxbe) { throw new XMLMarshalException(jaxbe); } } public String marshalToString(Marshalable obj) throws XMLMarshalException { try { StringWriter sw = new StringWriter(); marshaller.marshal(obj, sw); } catch (JAXBException jaxbe) { throw new XMLMarshalException(jaxbe); } } } /** Example data */ @XmlType @XmlAccessorType(XmlAccessType.FIELD) public class Data { @XmlAttribute(name = value) private String internalString; } /** Example POJO */ @XmlType @XmlRootElement(namespace = "project/schema") @XmlAccessorType(XmlAccessType.FIELD) public class Container implements Marshalable { @XmlElement(required = false, nillable = true) private int number; @XmlElement(required = false, nillable = true) private String word; @XmlElement(required = false, nillable = true) private Data data; } The result of calling marshal(container, new FileOutputStream("output.xml")) and marshalToString(container) are as follows: Output to file <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <ns2:container xmlns:ns2="project/schema"> <number>1</number> <word>stackoverflow</word> <data value="This is internal"></data> </ns2:container> and Output to String <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <ns2:container xmlns:ns2="project/schema"> <number>1</number> <word>stackoverflow</word> <data value="This is internal"/> </ns2:container>

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• Change color on single-series line chart using rCharts and Highcharts?

  - by Sharon

  Is it possible to change the color of a line using rCharts and Highcharts so that the line color changes depending on a factor? I've done this with ggplot2 but would like to make an interactive version if possible. I've tried h1 <- Highcharts$new() h1$chart(type="line") h1$series(data=mydf$myvalue, name="", groups = c("myfactor")) h1$xAxis(tickInterval = 4, categories = mydf$myXaxis) but that's not working, line stays the same color. Sample data myvalue <- c(16, 18, 5, 14, 10) myXaxis <- c(1,2,3,4,5) myfactor <- c("old", "old", "old", "new", "new") mydf <- data.frame(myvalue, myXaxis, myfactor) Thanks for any suggestions.

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