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• large test data for knapsack problem

  - by user347918

  i am researcher student. I am searching large data for knapsack problem. I wanted test my algorithm for knapsack problem. But i couldn't find large data. I need data has 1000 item and capacity is no matter. The point is item as much as huge it's good for my algorithm. Is there any huge data available in internet. Does anybody know please guys i need urgent.

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• Fading transition slideshow

  - by Simon Carlson

  I've got a JavaScript that produces a slideshow. It loads the pictures before starting the actual slideshow. Code below. var image1=new Image() image1.src="filename1.jpg" var image2=new Image() image2.src="filename2.jpg" var image3=new Image() image3.src="filename3.jpg" var step=1 function slideit(){ if (!document.images) return document.images.slide.src=eval("image"+step+".src") if (step<3) step++ else step=1 setTimeout("slideit()",1000) } And this is the required HTML for it to work: <img src="filename1.jpg" name="slide" /> Now, if I want to have fading transitions instead of just having new pictures popping up, how do I approach this? By fading I mean either have the old picture fade out, the new fade in or possibly and most likely both fade in/out. Can this be achieved with pure JavaScript and no jQuery or Ajax?

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• Import a number of csv files and replace NA by Zeros

  - by tao.hong

  I know how to do this individually. However, I have more than 1000 files. I decided to use a for loop. However, it seems like I did not find the correct way to evaluate my variables. Here is my code setwd('C:/data') filenames=dir() #find file names for (i in filenames){ adt = substr(x = i, start = 1, stop = nchar(i)-4) name=paste("data_", adt, sep="") assign(name, read.csv(i,header=T,sep=",")) #read each file and assign a variable name starting with data_ to it func=paste('name[is.na(name)] <- 0',sep="") # here is the place I have problem. R will not consider name is a parameter whose values change in each iteration eval((text=func)) }

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• How to make notification to group users with read/unread flag?

  - by user2335065

  I am making a notification system so that when users in a group perform an action, it will notify all the other users in the group. I want the notification to be marked "read" or "unread" for each user of the group. With that, I can easily retreive any unread notification for a user and display it. I am think about creating a notification table that have the following fields. +----------------------+ | notification | +----------------------+ | id | | userid | | content | | status (read/unread) | | time | +----------------------+ My question is: Whether it is the correct way of making the system? As it means that when there is 1,000 users in a group, then I have to insert 1,000 rows to the table. If not, what is the better way of doing this? If it is the way to do this, how can I write the php/mysql codes to do the looping of inserting the rows? Thanks!

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• How to Use Local Image with WebService Data

  - by Dishant

  I am Using SOAP WS for getting the Data. I got the four Parameters in Response - Topic_Name, Topic_Id, Topic_ImagePath and Topic_Details. Now I have All the Images of Topic Locally with the same name as i got from the web service for Particular Topic_ID. My question is I want to use Local image instead using the Topic_ImagePath 's Image but the data Must Come From the Web Service. I dont want to use if ..else condition because I have more than 1000 Topics, any one can explain how I get the Path of Local Image and Display it with the Data Comes From the Web Service.. Thanx in Advance.

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• slow record deletion with large ntext values

  - by asking

  I'm having trouble deleting some records via a stored procedure from a table in SQLServer 2008R2 that has ntext columns. The stored proc is timing out and running the query directly takes a very long time. The initial query was a straight "delete from y where x = z" and I've also tried running it in batches of 1000 with transactions but it is still slow and timing out in a stored proc. The majority of the records in the table will not be deleted each time (it's not just a once-off query but will be run other times). The ntext columns are not used in the where clause and I can't change the column types. Any suggestions on the quickest way to delete records with large ntext values? Thanks

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• What will be the value of i in the following pseudocode?

  - by user283403

  I got this question in a programming test. Do you think this question is even correct? Look at the answer choices. (2^x means 2 raised to x) Consider the following pseudocode. x := 1; i := 1; while (x = 1000) begin x := 2^x; i := i + 1; end; What is the value of i at the end of the pseudocode? a) 4 b) 5 c) 6 d) 7 e) 8 I am sure that the value of i will 1. I told the examiner of the discrepancy and he advised me the leave the question unanswered if I felt it was incorrect. What else could I have done?

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• Query Becnhmark.

  - by Deepika

  I am using autobech for doing becnhmark. An example of autobench command is as shown below. autobench --single_host --host1 testhost.foo.com --uri1 /index.html --quiet --timeout 5 --low_rate 20 --high_rate 200 --rate_step 20 --num_call 10 --num_conn 5000 --file bench.tsv The uri which I have to specify has a query attached to it. When I run the command which has the query, I get the following result dem_req_rate req_rate_localhost con_rate_localhost min_rep_rate_localhost avg_rep_rate_localhost max_rep_rate_localhost stddev_rep_rate_localhost resp_time_localhost net_io_localhost errors_localhost 200 0 20 0 0 0 0 0 0 101 400 0 40 0 0 0 0 0 0 101 600 0 60 0 0 0 0 0 0 101 800 0 80 0 0 0 0 0 0 101 1000 0 100 0 0 0 0 0 0 101 1200 0 120 0 0 0 0 0 0 101 1400 0 140 0 0 0 0 0 0 101 1600 0 160 0 0 0 0 0 0 101 1800 0 180 0 0 0 0 0 0 101 2000 0 200 0 0 0 0 0 0 101 The query request, response are all zeroes. Can anybody please tell me how to give a query as part of the uri? Thank you in advance

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• SQL Function for On Balance Volume (Financial Query)

  - by CraigJSte

  I would like to create a function for On Balance Volume (SQL Function). This is too complex of a calculation for met to figure out but here is the outline of the User Defined Table Function. If someone could help me to fill in the blanks I would appreciate it. Craig CREATE FUNCTION [dbo].[GetStdDev3] (@TKR VARCHAR(10)) RETURNS @results TABLE ( dayno SMALLINT IDENTITY(1,1) PRIMARY KEY , [date] DATETIME , [obv] FLOAT ) AS BEGIN DECLARE @rowcount SMALLINT INSERT @results ([date], [obv]) // CREATE A FUNCTION FOR ON BALANCE VOLUME // On Balance Volume is the Summ of Volume for Total Periods // OBV = 1000 at Period = 0 // OBV = OBV Previous + Previous Volume if Close Previous Close // OBV = OBV Previous - Previous Volume if Close < Previous Close // OBV = OBV Previous if Close = Previous Close // The actual Value of OBV is not important so to keep the ratio low we reduce the // Total Value of Tickers by 1/10th or 1/100th // For Value of Volume = Volume * .01 if Volume < 999 // For Value of Volume = Volume * .001 If Volume = 999 FROM Tickers RETURN END This is the Tickers table [dbo].[Tickers]( [ticker] [varchar](10) NULL, [date] [datetime] NULL, [high] [float] NULL, [low] [float] NULL, [open] [float] NULL, [close] [float] NULL, [volume] [float] NULL, [time] [datetime] NULL, [change] [float] NULL )

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• Mean of Sampleset and powered Sampleset

  - by Milla Well

  I am working on an ICA implementation wich is based on the assumption, that all source signals are independent. So I checked on the basic concepts of Dependence vs. Correlation and tried to show this example on sample data from numpy import * from numpy.random import * k = 1000 s = 10000 mn = 0 mnPow = 0 for i in arange(1,k): a = randn(s) a = a-mean(a) mn = mn + mean(a) mnPow = mnPow + mean(a**3) print "Mean X: ", mn/k print "Mean X^3: ", mnPow/k But I couldn't produce the last step of this example E(X^3) = 0: >> Mean X: -1.11174580826e-18 >> Mean X^3: -0.00125229267144 First value I would consider to be zero, but second value is too large, isn't it? Since I subtract the mean of a, I expected the mean of a^3 to be zero as well. Does the problem lie in the random number generator, the precision of the numerical values in my misunderstanding of the concepts of mean and expected value?

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• Need help to format the result page after searching

  - by kshama

  Hi, I have built a small text based search engine on ROR which will display relevant records having a specified search word in it.since few of the records has more than 1000 words i have truncated each result set to 200 characters.My views file search.html.erb looks like this <% @results_with_ranks.each do |result| -%> <% content_id = rtable.find(result[0]).content_id %> <% content= Content.find(content_id) %> <%= truncate content.body, :length => 200 %><br/> <p> Record id <%= content.id %></p> <hr style="color:blue"> <% end -%> I want to provide an option so that whenever any truncated record is selected its entire body has to be displayed. I also want to paginate the result page displaying some fixed number of records per page.Can any body help me in doing this? Thanks in advance.

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• Is a PHP-only "cache engine" ever worth it?

  - by adsads

  I wrote a rather small skeleton for my web apps and thought that I would also add a small cache for it. It is rather simple: If the current page exists as a file in the cache and the file isn't too old, read it out and exit instead of rebuilding the page If the current page isn't cached/outdated recalc the page and save it However, the bad thing about it is: My performance tests with a page that receives 40 relatively long posts via a MySQL query said that with using the cache, it took even longer to handle a single request (1000 tests each) How can that happen? Should I just remove the complete raw-PHP cache and relieve on the availability of some PHP cache like memcached or so?

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• In what circumstances can large pages produce a speedup ?

  - by timday

  Modern x86 CPUs have the ability to support larger page sizes than the legacy 4K (ie 2MB or 4MB), and there are OS facilities (Linux, Windows) to access this functionality. The Microsoft link above states large pages "increase the efficiency of the translation buffer, which can increase performance for frequently accessed memory". Which isn't very helpful in predicting whether large pages will improve any given situation. I'm interested in concrete, preferably quantified, examples of where moving some program logic (or a whole application) to use huge pages has resulted in some performance improvement. Anyone got any success stories ? There's one particular case I know of myself: using huge pages can dramatically reduce the time needed to fork a large process (presumably as the number of TLB records needing copying is reduced by a factor on the order of 1000). I'm interested in whether huge pages can also benefit more mundane applications though.

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• speed up calling lot of entities, and getting unique values, google app engine python

  - by user291071

  OK this is a 2 part question, I've seen and searched for several methods to get a list of unique values for a class and haven't been practically happy with any method so far. So anyone have a simple example code of getting unique values for instance for this code. Here is my super slow example. class LinkRating2(db.Model): user = db.StringProperty() link = db.StringProperty() rating2 = db.FloatProperty() def uniqueLinkGet(tabl): start = time.time() dic = {} query = tabl.all() for obj in query: dic[obj.link]=1 end = time.time() print end-start return dic My second question is calling for instance an iterator instead of fetch slower? Is there a faster method to do this code below? Especially if the number of elements called be larger than 1000? query = LinkRating2.all() link1 = 'some random string' a = query.filter('link = ', link1) adic ={} for itema in a: adic[itema.user]=itema.rating2

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• What is the optimal number of threads for performing IO operations in java?

  - by marc

  In Goetz's "Java Concurrency in Practice", in a footnote on page 101, he writes "For computational problems like this that do not I/O and access no shared data, Ncpu or Ncpu+1 threads yield optimal throughput; more threads do not help, and may in fact degrade performance..." My question is, when performing I/O operations such as file writing, file reading, file deleting, etc, are there guidelines for the number of threads to use to achieve maximum performance? I understand this will be just a guide number, since disk speeds and a host of other factors play into this. Still, I'm wondering: can 20 threads write 1000 separate files to disk faster than 4 threads can on a 4-cpu machine?

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• Getting repeat values after copying 2-3 items to clipboard in android?

  - by Gurpreet singh

  I am using clipboard code like below in my app.Everything is working fine if i copy one item at a time.But when we copy 2-3 items one after other and paste somewhere it starts retrieving repeated past value from clipboard rather than the current value.After googling a lot i came to know that its a problem with Samsung phones and i need to clear clipboard history for that.But i could not find any way to clear clipboard history. Public void CopyToClipboard { int pos = (Integer) v.getTag(); StatusEntity obj=getItem(pos); ClipboardManager clipmanager= (ClipboardManager)getContext().getSystemService(getContext().CLIPBOARD_SERVICE); ClipData clip=ClipData.newPlainText("data",obj.getStatus()); clipmanager.setPrimaryClip(clip); Toast.makeText(getContext(), "Copied to clipboard", 1000).show(); } Hoping that anyone of you can help me regarding this .Any help would be appreciated.

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• Exception handling in WebForms

  - by user999379

  I have a webform with a formview <asp:FormView ID="formViewBrouwers" runat="server" AllowPaging="True" DataKeyNames="BrouwerNr" DataSourceID="brouwerDataSource" onitemupdated="formViewBrouwers_ItemUpdated" onitemupdating="formViewBrouwers_ItemUpdating" oniteminserted="formViewBrouwers_ItemInserted" oniteminserting="formViewBrouwers_ItemInserting"> <EditItemTemplate> BrouwerNr: <asp:Label ID="BrouwerNrLabel1" runat="server" Text='<%# Eval("BrouwerNr") %>' /> <br /> BrNaam: <asp:TextBox ID="BrNaamTextBox" runat="server" Text='<%# Bind("BrNaam") %>' /> <br /> Adres: <asp:TextBox ID="AdresTextBox" runat="server" Text='<%# Bind("Adres") %>' /> <br /> Postcode: <asp:TextBox ID="PostcodeTextBox" runat="server" Text='<%# Bind("Postcode") %>' /> <br /> Gemeente: <asp:TextBox ID="GemeenteTextBox" runat="server" Text='<%# Bind("Gemeente") %>' /> <br /> Omzet: <asp:TextBox ID="OmzetTextBox" runat="server" Text='<%# Bind("Omzet") %>' /> <br /> Status: <asp:TextBox ID="StatusTextBox" runat="server" Text='<%# Bind("Status") %>' /> <br /> <asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True" CommandName="Update" Text="Update" /> &nbsp;<asp:LinkButton ID="UpdateCancelButton" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel" /> </EditItemTemplate> <InsertItemTemplate> BrNaam: <asp:TextBox ID="BrNaamTextBox" runat="server" Text='<%# Bind("BrNaam") %>' /> <br /> Adres: <asp:TextBox ID="AdresTextBox" runat="server" Text='<%# Bind("Adres") %>' /> <br /> Postcode: <asp:TextBox ID="PostcodeTextBox" runat="server" Text='<%# Bind("Postcode") %>' /> <br /> Gemeente: <asp:TextBox ID="GemeenteTextBox" runat="server" Text='<%# Bind("Gemeente") %>' /> <br /> Omzet: <asp:TextBox ID="OmzetTextBox" runat="server" Text='<%# Bind("Omzet") %>' /> <br /> Status: <asp:TextBox ID="StatusTextBox" runat="server" Text='<%# Bind("Status") %>' /> <br /> <asp:LinkButton ID="InsertButton" runat="server" CausesValidation="True" CommandName="Insert" Text="Insert" /> &nbsp;<asp:LinkButton ID="InsertCancelButton" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel" /> </InsertItemTemplate> <ItemTemplate> BrouwerNr: <asp:Label ID="BrouwerNrLabel" runat="server" Text='<%# Eval("BrouwerNr") %>' /> <br /> BrNaam: <asp:Label ID="BrNaamLabel" runat="server" Text='<%# Bind("BrNaam") %>' /> <br /> Adres: <asp:Label ID="AdresLabel" runat="server" Text='<%# Bind("Adres") %>' /> <br /> Postcode: <asp:Label ID="PostcodeLabel" runat="server" Text='<%# Bind("Postcode") %>' /> <br /> Gemeente: <asp:Label ID="GemeenteLabel" runat="server" Text='<%# Bind("Gemeente") %>' /> <br /> Omzet: <asp:Label ID="OmzetLabel" runat="server" Text='<%# Bind("Omzet") %>' /> <br /> Status: <asp:Label ID="StatusLabel" runat="server" Text='<%# Bind("Status") %>' /> <br /> <asp:LinkButton ID="EditButton" runat="server" CausesValidation="False" CommandName="Edit" Text="Edit" /> &nbsp;<asp:LinkButton ID="DeleteButton" runat="server" CausesValidation="False" CommandName="Delete" Text="Delete" /> &nbsp;<asp:LinkButton ID="NewButton" runat="server" CausesValidation="False" CommandName="New" Text="New" /> </ItemTemplate> <PagerSettings Mode="NextPreviousFirstLast" /> </asp:FormView> In my property Postcode I check the value like this: private Int16 postcodeValue; public Int16 Postcode { get { return postcodeValue; } set { if (value < 1000 || value > 9999) { throw new Exception("Postcode moet tussen 1000 en 9999 liggen"); } else { postcodeValue = value; } } } How can I handle the exception I threw? If there is an exception I want a label to appear with the following exception?

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• C++, create an instance from a static method

  - by Manux

  Hello, let's say I want my users to use only one class, say SpecialData. Now, this data class would have many methods, and depending on the type of data, the methods do different things, internally, but return externally similar results. Therefore my wanting to have one "public" class and other "private", child classes that would change the behavior of methods, etc... It would be amazingly more simple for some types of data that need to be built to do something like this: SpecialData& sm = SpecialData::new_supermatrix(); and new_supermatrix() would return a SuperMatrix instance, which inherits from most behaviors of SpecialData. my header: static SpecialData& new_supermatrix(); my cpp: SpecialData& SpecialData::new_supermatrix()(){ return SuperMatrix(MATRIX_DEFAULT_MAGNITUDE,1000,1239,FLOAT32,etc...); } The problem is, I get this error, which is probably logical due to the circumstances: invalid initialization of non-const reference of type ‘SpecialData&’ from a temporary of type ‘SpecialData’ So, any ideas?

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• How can I improve the below query?

  - by Newbie

  I have the following input. INPUT: TableA ID Sentences --- ---------- 1 I am a student 2 Have a nice time guys! What I need to do is to extract the words from the sentence(s) and insert each individual word in another table OUTPUT: SentenceID WordOccurance Word ---------- ------------ ----- 1 1 I 1 2 am 1 3 a 1 4 student 2 1 Have 2 2 a 2 3 nice 2 4 time 2 5 guys! I was able to get the answer by using the below query ;With numCTE As ( Select rn = 1 Union all Select rn+1 from numCTE where rn<1000) select SentenceID=id, WordOccurance=row_number()over(partition by TableA.ID order by rn), Word = substring(' '+sentences+' ', rn+1, charindex(' ',' '+sentences+' ', rn+1)-rn-1) from TableA join numCTE on rn <= len(' '+sentences+' ') where substring(' '+sentences+' ', rn,1) = ' ' order by id, rn How can I improve this query of mine.? Basically I am looking for a better solution than the one presented Thanks

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• How do you automatically refresh part of a page automatically using Javascript or AJAX?

  - by Ryan

  $messages = $db->query("SELECT * FROM chatmessages ORDER BY datetime DESC, displayorderid DESC LIMIT 0,10"); while($message = $db->fetch_array($messages)) { $oldmessages[] = $message['message']; } $oldmessages = array_reverse($oldmessages); ?> <div id="chat"> <?php for ($count = 0; $count < 9; $count++) { echo $oldmessages[$count]; } ?> <script language="javascript" type="text/javascript"> <!-- setInterval( "document.getElementById('chat').innerHTML='<NEW CONTENT OF #CHAT>'", 1000 ); --> </script> </div> I'm trying to create a PHP chatroom script but I'm having a lot of trouble getting it to AutoRefresh The content should automatically update to , how do you make it do that? I've been searching for almost an hour

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• PHP: Star rating system concept?

  - by Prashant

  I am using PHP/MYSQL/JQUERY. I have a site which have news section. On news details page, I want to add star rating system which will allow user to rate the news story. I am using this jquery rating system http://www.fyneworks.com/jquery/star-rating/ Now, I am not getting what will be the database structure and then what I need to code in PHP. I need what logic will be applied for this, like if 1000 people voted for the article, some given rating as 2 or 3 or1 or 5. Then Where I should be storing (db structure) this all and what I'll calculate (in php code). If someone has any article which shows this concept please provide. Please help, to understand the logic and concept of this. Thanks!

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• Do bit operations cause programs to run slower?

  - by flashnik

  I'm dealing with a problem which needs to work with a lot of data. Currently its values are represented as an unsigned int. I know that real values do not exceed a limit of 1000. Questions I can use unsigned short to store it. An upside to this is that it'll use less storage space to store the value. Will performance suffer? If I decided to store data as short but all the calling functions use int, it's recognized that I need to convert between these datatypes when storing or extracting values. Will performance suffer? Will the loss in performance be dramatic? If I decided to not use short but just 10 bits packed into an array of unsigned int. What will happen in this case comparing with previous ones?

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• ASP.NET C# Application Object Getters and Setters

  - by kellax

  I have had a hard time finiding a newbie friendly example of accessing Application Object. I have few things ( arrays ) i would like to store in Application Object to keep as persistant data for about 2h till AppRecycle Anyhow i know how to set an Application Object variable this way: // One way String[] users = new String[1000]; Application["users"] = users; // Another way Application.Add("users", users); However i do not know how to access these variables once in Application Object there is a Getter method Get however it requires int index and other one Contents which get's everything. Here i try to retrive my String[] array but gives me a error that i am trying to convert Object to String. String[] usersTable = Application["users"]; // Since this is an object i also tried Application.users but gives error

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• mysql varchar innodb page size limit 8100 bytes

  - by David19801

  Hi, Regarding innodb, someone recently told me: "the varchar content beyond 768 bytes is stored in supplemental 16K pages" This is very interesting. If each varchar will be latin1, which I believe stores as 1byte per letter, would a single varchar(500) (<768 bytes) require an extra i/o as a varchar(1000) (768 bytes) would?? (this question is to find out if all varchars or just big varchars are split into a separate page) Is the 768 limit per varchar or for all varchars in the row added together? (for example, does this get optimized - varchar(300), varchar(300), varchar(300): [where each individual varchar column is below 768 but together they are above 768 characters]? I am confused about if the 768 limit relates to each individual varchar or all varchars in the row totaled (as in the question). Any clarification? EDIT: Removed part about CHARS due to finding out about their limit of 255 max.

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• Binomial test in Python for very large numbers

  - by Morlock

  I need to do a binomial test in Python that allows calculation for 'n' numbers of the order of 10000. I have implemented a quick binomial_test function using scipy.misc.comb, however, it is pretty much limited around n = 1000, I guess because it reaches the biggest representable number while computing factorials or the combinatorial itself. Here is my function: from scipy.misc import comb def binomial_test(n, k): """Calculate binomial probability """ p = comb(n, k) * 0.5**k * 0.5**(n-k) return p How could I use a native python (or numpy, scipy...) function in order to calculate that binomial probability? If possible, I need scipy 0.7.2 compatible code. Many thanks!

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