values - Page 204 - Developer IT

Converting excel files to python to frequency

- by Jacob

Essentially I've got an excel files with voltage in the first column, and time in the second. I want to find the period of the voltages, as it returns a graph of voltage in y axis and time in x axis with a periodicity, looking similar to a sine function. To find the frequency I have uploaded my excel file to python as I think this will make it easier- there may be something I've missed that will simplify this. So far in python I have: import xlrd import numpy as N import numpy.fft as F import matplotlib.pyplot as P wb = xlrd.open_workbook('temp7.xls') #LOADING EXCEL FILE wb.sheet_names() sh = wb.sheet_by_index(0) first_column = sh.col_values(1) #VALUES FROM EXCEL second_column = sh.col_values(2) #VALUES FROM EXCEL Now how do I find the frequency from this? Huge thanks to anyone who can help! Jacob

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What is the right approach when using STL container for median calculation?

- by sharkin

Let's say I need to retrieve the median from a sequence of 1000000 random numeric values. If using anything but STL::list, I have no (built-in) way to sort sequence for median calculation. If using STL::list, I can't randomly access values to retrieve middle (median) of sorted sequence. Is it better to implement sorting myself and go with e.g. STL::vector, or is it better to use STL::list and use STL::list::iterator to for-loop-walk to the median value? The latter seems less overheadish, but also feels more ugly.. Or are there more and better alternatives for me?

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Protocol Buffers In C#: How Are Boxed Value Types Handled

- by Greg Dean

In the following examples: public class RowData { public object[] Values; } public class FieldData { public object Value; } I am curious as how either protobuf-net or dotnet-protobufs would handle such classes. I am more familiar with protobuf-net, so what I actually have is: [ProtoContract] public class RowData { [ProtoMember(1)] public object[] Values; } [ProtoContract] public class FieldData { [ProtoMember(1)] public object Value; } However I get an error saying "No suitable Default Object encoding found". Is there an easy way to treat these classes, that I am just not aware of? To elaborate more on the use case: This is a scaled down version of a data class used in remoting. So essentially it looks like this: FieldData data = new FieldData(); data.Value = 8; remoteObject.DoSomething(data); Note: I've omitted the ISerializable implementation for simplicity, but it is as you'd expect.

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PHP Associative Array Duplicate Key?

- by Steven

Hello, I have an associative array, however when I add values to it using the below function it seems to overwrite the same keys. Is there a way to have multiple of the same keys with different values? Or is there another form of array that has the same format? I want to have 42=56 42=86 42=97 51=64 51=52 etc etc function array_push_associative(&$arr) { $args = func_get_args(); foreach ($args as $arg) { if (is_array($arg)) { foreach ($arg as $key => $value) { $arr[$key] = $value; $ret++; } }else{ $arr[$arg] = ""; } } return $ret; }

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TableAdapter to return ONLY selected columns? (VS2008)

- by MattSlay

(VS2008) I'm trying to configure a TableAdapter in a Typed DataSet to return only a certain subset of columns from the main schema of the table on which it is based, but it always returns the entire schema (all columns) with blank values in the columns I have omitted. The TableAdpater has the default Fill and GetData() methods that come from the wizard, which contain every column in the table, which is fine. I then added a new parameterized query method called GetActiveJobsByCustNo(CustNo), and I only included a few columns in the SQL query that I actually want to be in this table view. But, again, it returns all the columns in the master table schema, with empty values for the columns I omitted. The reason I am wanting this, is so I can just get a few columns back to use that table view with AutoGenerateColumns in an ASP.NET GridView. With it giving me back EVERY column i nthe schema, my presentation GridView contains way more columns that I want to show th user. And, I want to avoid have to declare the columns in the GridView.

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Haskell compile time function calculation

- by egon

I would like to precalculate values for a function at compile-time. Example (real function is more complex, didn't try compiling): base = 10 mymodulus n = n `mod` base -- or substitute with a function that takes -- too much to compute at runtime printmodules 0 = [mymodulus 0] printmodules z = (mymodulus z):(printmodules (z-1)) main = printmodules 64 I know that mymodulus n will be called only with n < 64 and I would like to precalculate mymodulus for n values of 0..64 at compile time. The reason is that mymodulus would be really expensive and will be reused multiple times.

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Walk/loop through an XSL key: how?

- by krisvandenbergh

Is there a way to walk-through a key and output all the values it contains? I though of it this way: <xsl:for-each select="key('kElement', '.')"> <li><xsl:value-of select="." /></li> </xsl:for-each> However, this does not work. I simply want to list all the values in a key for testing purposes. The question is simply: how can this be done?

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Last in First out UDP structure in MatLab.

- by D Zondervan

I am using MatLabs UDP function in their instrument control toolbox to send data packets from one computer to another. The first computer is constantly updating data values and sending them to the other computer, and I want that computer to be able to query the first one for the most recent values whenever it needs them. However, the default implementation of the UDP send and receive in MatLab is a FIFO structure- the first packet I send is the first the other computer receives when they execute the "fscanf" function. I want the last packet I sent to be the one the fscanf function returns. Is this possible or do I need to use a different protocol?

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.NET SettingsProvider/ApplicationSettingsBase caching

- by Andy White

I'm looking at some code that uses the .NET System.Configuration.SettingsProvider and ApplicationSettingsBase to handle configuration. We have a class that derives from SettingsProvider that uses a database as the data store, and then we have other settings classes that inherit from ApplicationSettingsBase, and have the [SettingsProvider(typeof(MySettingsProvider))] attribute. The problem is that we're using these settings classes in multiple applications, but they seem to permanently cache the configuration values, the first time they are loaded. The issue is that if a setting is changed in one application, the other applications will not get the setting until the next restart, because they are cached everywhere. My question is: is there a way to force the SettingsProvider implementation, or the classes derived from ApplicationSettingsBase to not cache values, and re-query the datastore every time the setting is accessed? A valid answer might be that these classes were not intended to be used in multi-application environments...

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Matlab: Adding symbols to figure

- by niko

Hi, Below is the user interface I have created to simulate LDPC coding and decoding The code sequence is decoded iteratively by passing values between the left and right nodes through the connections. The first thing it would be good to add in order to improve visualization is to add arrows to the connections in the direction of passing values. The alternative is to draw a bigger arrow at the top of the connection showing the direction. Another thing I would like to do is displaying the current mathematical operation below the connection (in this example c * H'). What I don't know how to do is displaying special characters and mathematical symbols and other kinds of text such as subscript and superscript in the figure (for example sum sign and subscript "T" instead of sign ="'" to indicate transposed matrix). I would be very thankful if anyone could point to any useful resources for the questions above or show the solution. Thank you.

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Dependency Injection and Unit of Work pattern

- by sunwukung

I have a dilemma. I've used DI (read: factory) to provide core components for a homebrew ORM. The container provides database connections, DAO's,Mappers and their resultant Domain Objects on request. Here's a basic outline of the Mappers and Domain Object classes class Mapper{ public function __constructor($DAO){ $this->DAO = $DAO; } public function load($id){ if(isset(Monitor::members[$id]){ return Monitor::members[$id]; $values = $this->DAO->selectStmt($id); //field mapping process omitted for brevity $Object = new Object($values); return $Object; } } class User(){ public function setName($string){ $this->name = $string; //mark modified by means fair or foul } } The ORM also contains a class (Monitor) based on the Unit of Work pattern i.e. class Monitor(){ private static array modified; private static array dirty; public function markClean($class); public function markModified($class); } The ORM class itself simply co-ordinates resources extracted from the DI container. So, to instantiate a new User object: $Container = new DI_Container; $ORM = new ORM($Container); $User = $ORM->load('user',1); //at this point the container instantiates a mapper class //and passes a database connection to it via the constructor //the mapper then takes the second argument and loads the user with that id $User->setName('Rumpelstiltskin');//at this point, User must mark itself as "modified" My question is this. At the point when a user sets values on a Domain Object class, I need to mark the class as "dirty" in the Monitor class. I have one of three options as I can see it 1: Pass an instance of the Monitor class to the Domain Object. I noticed this gets marked as recursive in FirePHP - i.e. $this-Monitor-markModified($this) 2: Instantiate the Monitor directly in the Domain Object - does this break DI? 3: Make the Monitor methods static, and call them from inside the Domain Object - this breaks DI too doesn't it? What would be your recommended course of action (other than use an existing ORM, I'm doing this for fun...)

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Insert Data from to a table

- by Lee_McIntosh

I have a table that lists number of comments from a particular site like the following: Date Site Comments Total --------------------------------------------------------------- 2010-04-01 00:00:00.000 1 5 5 2010-04-01 00:00:00.000 2 8 13 2010-04-01 00:00:00.000 4 2 7 2010-04-01 00:00:00.000 7 13 13 2010-04-01 00:00:00.000 9 1 2 I have another table that lists ALL sites for example from 1 to 10 Site ----- 1 2 ... 9 10 Using the following code i can find out which sites are missing entries for the previous month: SELECT s.site from tbl_Sites s EXCEPT SELECT c.site from tbl_Comments c WHERE c.[Date] = DATEADD(mm, DATEDIFF(mm, 0, GetDate()) -1,0) Producing: site ----- 3 5 6 8 10 I would like to be able to insert the missing sites that is listed from my query into the comments table with some default values, i.e '0's Date Site Comments Total --------------------------------------------------------------- 2010-04-01 00:00:00.000 3 0 0 2010-04-01 00:00:00.000 5 0 0 2010-04-01 00:00:00.000 6 0 0 2010-04-01 00:00:00.000 8 0 0 2010-04-01 00:00:00.000 10 0 0 the question is, how did i update/insert the table/values? cheers, Lee

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Having trouble scraping an ASP .NET web page

- by Seth

I am trying to scrape an ASP.NET website but am having trouble getting the results from a post. I have the following python code and am using httplib2 and BeautifulSoup: conn = Http() # do a get first to retrieve important values page = conn.request(u"http://somepage.com/Search.aspx", "GET") #event_validation and viewstate variables retrieved from GET here... body = {"__EVENTARGUMENT" : "", "__EVENTTARGET" : "" , "__EVENTVALIDATION": event_validation, "__VIEWSTATE" : viewstate, "ctl00_ContentPlaceHolder1_GovernmentCheckBox" : "On", "ctl00_ContentPlaceHolder1_NonGovernmentCheckBox" : "On", "ctl00_ContentPlaceHolder1_SchoolKeyValue" : "", "ctl00_ContentPlaceHolder1_SchoolNameTextBox" : "", "ctl00_ContentPlaceHolder1_ScriptManager1" : "ctl00_ContentPlaceHolder1_UpdatePanel1|cct100_ContentPlaceHolder1_SearchImageButton", "ct100_ContentPlaceHolder1_SearchImageButton.x" : "375", "ct100_ContentPlaceHolder1_SearchImageButton.y" : "11", "ctl00_ContentPlaceHolder1_SuburbTownTextBox" : "Adelaide,SA,5000", "hiddenInputToUpdateATBuffer_CommonToolkitScripts" : 1} headers = {"Content-type": "application/x-www-form-urlencoded"} resp, content = conn.request(url,"POST", headers=headers, body=urlencode(body)) When I print content I still seem to be getting the same results as the "GET" or is there a fundamental concept I'm missing to retrieve the result values of an ASP .NET post?

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Automate paster create -t plone3_buildout

- by roopesh

I want to automate the process of plone3_buildout. Explanation: The default(the one I use) way of building a plone site is using paster, like so: paster create -t plone3_buildout This asks me a few questions and then create a default buildout for the site. What I want: I want to automate this process using buildout. My buildout will execute this paster command, feed in my preconfigured values to the paster. I haven't found a recipe which can do this. If someone has an idea of how to do this, please share the info. If there is a recipe which can feed values to interactive commands(with known output, like with plone3_buildout command), that would be useful too.

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Iterating Oracle collections of objects with out exploding them

- by Scott Bailey

I'm using Oracle object data types to represent a timespan or period. And I've got to do a bunch of operations that involve working with collections of periods. Iterating over collections in SQL is significantly faster than in PL/SQL. CREATE TYPE PERIOD AS OBJECT ( beginning DATE, ending DATE, ... some member functions...); CREATE TYPE PERIOD_TABLE AS TABLE OF PERIOD; -- sample usage SELECT <<period object>>.contains(period2) FROM TABLE(period_table1) t The problem is that the TABLE() function explodes the objects into scalar values, and I really need the objects instead. I could use the scalar values to recreate the objects but this would incur the overhead of re-instantiating the objects. And the period is designed to be subclassed so there would be additional difficulty trying to figure out what to initialize it as. Is there another way to do this that doesn't destroy my objects?

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Probleme with id increment

- by Mercer

hello, when i do this request i have an error INSERT INTO FR_METIERPUBLI( D_NIDMTR, D_NIDPUBLI ) VALUES ( 'SELECT MAX( D_NIDMTR ) FROM FR_METIERPUBLI + 1', 1000 i want to increment my id

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Difference in amplitude from the same source using FFT

- by Anders

Hi, I have a question regarding use of FFT. Using function getBand(int i) with Minim i can extract the amplitude of a specific frequency and do pretty maps of it. Works great. However, this is a more of a curiosity question. When i look at the values extracted from playing the same song two twice using the same frequency (so the amplitude should be identical) but i get very different values - why is this? 0.0,0.0,0.0,0.0,0.0,0.08706585,0.23708777,0.83046436,0.74603105,0.30447206 0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.08706585,0.4790409,0.9608221,0.83046436,0.74603105

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Make UILabel show "No results" instead of "nan"

- by Mike Rychev

I have a small app, where user can make some calculations and solve equations. For example, if in a square equation discriminant is less than zero, the x1 and x2 values are "nan", so when I assign x1 and x2 values to UILabels they show "nan" as well. Writing a lot of if's like if(D<0) [label setText:[NSString stringWithFormat: @"No solutions"]]; Doesn't help-there are too many cases. I want to check if after [label setText:[NSString stringWithFormat: @"%f", x]]; label's value is "nan", the label's value will be set to @"No solutions". Doing simple if(label==@"nan") { //code } doesn't help. Thanks in advance!

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Custom Class to store the properties and passing the class object across the pages - ASP.NEt

- by NLV

Hello I've a requirement where i need to pass some objects across the pages. So i created a custom class with all the properties required and created a instance of it and assigned all the properties appropriately. I then put that object in the session and took it the other page. The problem is that even when i set the properties values to the class it is coming as null. I set a breakpoint in the getter-setter and saw that the value itself is coming as null. Code - public class GetDataSetForReports { private Table m_aspTable; private int m_reportID; private string m_accountKey; private string m_siteKey; private string m_imUserName; /// <summary> /// Asp Table containing the filters /// </summary> public Table aspTable { get { return m_aspTable; } set { m_aspTable = aspTable; } } /// <summary> /// Report ID /// </summary> public int reportID { get { return m_reportID; } set { m_reportID = reportID; } } /// <summary> /// All the accounts selected /// </summary> public string accountKey { get { return m_accountKey; } set { m_accountKey = accountKey; } } /// <summary> /// All the sites selected /// </summary> public string siteKey { get { return m_siteKey; } set { m_siteKey = siteKey; } } /// <summary> /// Current User Name /// </summary> public string imUserName { get { return m_imUserName; } set { m_imUserName = imUserName; } } } This is how i'm creating an instance in the page1 and trying to get it in the page2. Page1 Code //Add the objects to the GetDataSetForReports Class GetDataSetForReports oGetDSForReports = new GetDataSetForReports(); oGetDSForReports.aspTable = aspTable; oGetDSForReports.reportID = iReportID; oGetDSForReports.accountKey = AccountKey; oGetDSForReports.siteKey = Sitekey; oGetDSForReports.imUserName = this.imUserName.ToString(); But the values are not getting set at all. The values are not passing to the class (to the setter) at all. Am i making any OOPS blunder? Any ideas? NLV

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Write Scheme data structures so they can be eval-d back in, or alternative

- by Jesse Millikan

I'm writing an application (A juggling pattern animator) in PLT Scheme that accepts Scheme expressions as values for some fields. I'm attempting to write a small text editor that will let me "explode" expressions into expressions that can still be eval'd but contain the data as literals for manual tweaking. For example, (4hss->sexp "747") is a function call that generates a legitimate pattern. If I eval and print that, it becomes (((7 3) - - -) (- - (4 2) -) (- (7 2) - -) (- - - (7 1)) ((4 0) - - -) (- - (7 0) -) (- (7 2) - -) (- - - (4 3)) ((7 3) - - -) (- - (7 0) -) (- (4 1) - -) (- - - (7 1))) which can be "read" as a string, but will not "eval" the same as the function. For this statement, of course, what I need would be as simple as (quote (((7 3... but other examples are non-trivial. This one, for example, contains structs which print as vectors: pair-of-jugglers ; --> (#(struct:hand #(struct:position -0.35 2.0 1.0) #(struct:position -0.6 2.05 1.1) 1.832595714594046) #(struct:hand #(struct:position 0.35 2.0 1.0) #(struct:position 0.6 2.0500000000000003 1.1) 1.308996938995747) #(struct:hand #(struct:position 0.35 -2.0 1.0) #(struct:position 0.6 -2.05 1.1) -1.3089969389957472) #(struct:hand #(struct:position -0.35 -2.0 1.0) #(struct:position -0.6 -2.05 1.1) -1.8325957145940461)) I've thought of at least three possible solutions, none of which I like very much. Solution A is to write a recursive eval-able output function myself for a reasonably large subset of the values that I might be using. There (probably...) won't be any circular references by the nature of the data structures used, so that wouldn't be such a long job. The output would end up looking like `(((3 0) (... ; ex 1 `(,(make-hand (make-position ... ; ex 2 Or even worse if I could't figure out how to do it properly with quasiquoting. Solution B would be to write out everything as (read (open-input-string "(big-long-s-expression)")) which, technically, solves the problem I'm bringing up but is... ugly. Solution C might be a different approach of giving up eval and using only read for parsing input, or an uglier approach where the s-expression is used as directly data if eval fails, but those both seem unpleasant compared to using scheme values directly. Undiscovered Solution D would be a PLT Scheme option, function or library I haven't located that would match Solution A. Help me out before I start having bad recursion dreams again.

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Using Accelerometer in Wiimote for Physics Practicals

- by Omar

I have to develop some software in my school to utilize the accelerometer in the Wiimote for recording data from experiments, for example finding the acceleration and velocity of a moving object. I understand how the accelerometer values will be used but I am sort of stuck on the programming front. There is a set of things that I would like to do: Live streaming of data from the Wiimote via bluetooth Use the accelerometer values to find velocity and displacment via integration Plot a set of results Avoid the use of the infrared sensor on the Wiimote Please can anyone give me their thoughts on how to go about this. Also it would be great if people could direct me to existing projects that utizlise the wiimote. Also can someone suggest what would be the best programming language to use for this. My current bet is on using Visual basic. Any sort of help is greatly appretiated.

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T-SQL out of order insert

- by tearman

Basically I have a User-Defined Table Type (for use as a table-valued variable) which I'm referencing in a stored procedure that effectively just calls two other stored procedures, then inserts those values into the table type. Id est INSERT INTO @tableValuedVariable (var1, var2, var3, var4, var5) EXEC [dbo].StoredProcedure1; INSERT INTO @tableValuedVariable (var1, var2, var5) EXEC [dbo].StoredProcedure2; You can probably already tell what I'm going to ask. Basically StoredProcedure2 only returns a few of the values the table is set to hold, and I'd like those other variables to just be null (as defined as default). Only SQL is complaining that I'm not specifying all the variables available to that table. The return datasets can be quite sizable so I'd like to avoid loops and such for obvious reasons. Thanks for any help.

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CFGRID - replace data store or filter on more than one column

- by Casuzen

ColdFusion 8 I have a cfgrid that that is based on a query. It is not bound to a cfc function because I want a scrolling grid, not a paged grid (you must supply the page number and page size if you use BIND).. I can figure out how to make it filter on one column by using the following code, but I really need to filter on three columns... grid.getDataSource().filter("OT_MILESTONE",t1); Adding more to the filter string does not do the trick...it ignores anything more than the first pair of values.. so..I thought if I called a function that passes the three values and returned the query results to me, I could replace the Data Store for the grid..but I cannot figure out the syntax to get it to replace. The returned variable for the query has the following format: {"COLUMNS":["SEQ_KEY","ID","OT_MILESTONE"],"DATA":[[63677,"x","y"]]} Any ideas?

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quick mysql query problem

- by Haroldo

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Download attachment issue with IE6-8 - non ssl

- by Arun P Johny

I'm facing an issue with file download with IE6-8 in non ssl environment. I've seen a lot of articles about the IE attachment download issue with ssl. As per the articles I tried to set the values of Pragma, Cache-Control headers, but still no luck with it. These are my response headers Cache-Control: private, max-age=5 Date: Tue, 25 May 2010 11:06:02 GMT Pragma: private Content-Length: 40492 Content-Type: application/pdf Content-Disposition: Attachment;Filename="file name.pdf" Server: Apache-Coyote/1.1 I've set the header values after going through some of these sites KB 812935 KB 316431 But these items are related to SSL. I've checked the response body and headers using fiddler, the response body is proper. I'm using window.open(url, "_blank") to download the file, if I change it to window.open(url, "_parent") or change the "Content-Disposition" to 'inline;Filename="file name.pdf"' it works fine. Please help me to solve this problem

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