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  • File Segmentation when trying to write in a file

    - by user1286390
    I am trying in C language to use the method of bisection to find the roots of some equation, however when I try to write every step of this process in a file I get the problem "Segmentation fault". This might be an idiot fault that I did, however I have been trying to solve this for a long time. I am compiling using gcc and that is the code: #include <stdio.h> #include <stdlib.h> #include <math.h> #define R 1.0 #define h 1.0 double function(double a); void attractor(double *a1, double *a2, double *epsilon); void attractor(double *a1, double *a2, double *epsilon) { FILE* bisection; double a2_copia, a3, fa1, fa2; bisection = fopen("bisection-part1.txt", "w"); fa1 = function(*a1); fa2 = function(*a2); if(function(*a1) - function(*a2) > 0.0) *epsilon = function(*a1) - function(*a2); else *epsilon = function(*a2) - function(*a1); fprintf(bisection, "a1 a2 fa1 fa2 epsilon\n"); a2_copia = 0.0; if(function(*a1) * function(*a2) < 0.0 && *epsilon >= 0.00001) { a3 = *a2 - (*a2 - *a1); a2_copia = *a2; *a2 = a3; if(function(*a1) - function(*a2) > 0.0) *epsilon = function(*a1) - function(*a2); else *epsilon = function(*a2) - function(*a1); if(function(*a1) * function(*a2) < 0.0 && *epsilon >= 0.00001) { fprintf(bisection, "%.4f %.4f %.4f %.4f %.4f\n", *a1, *a2, function(*a1), function(*a1), *epsilon); attractor(a1, a2, epsilon); } else { *a2 = a2_copia; *a1 = a3; if(function(*a1) - function(*a2) > 0) *epsilon = function(*a1) - function(*a2); else *epsilon = function(*a2) - function(*a1); if(function(*a1) * function(*a2) < 0.0 && *epsilon >= 0.00001) { fprintf(bisection, "%.4f %.4f %.4f %.4f %.4f\n", *a1, *a2, function(*a1), function(*a1), *epsilon); attractor(a1, a2, epsilon); } } } fa1 = function(*a1); fa2 = function(*a2); if(function(*a1) - function(*a2) > 0.0) *epsilon = function(*a1) - function(*a2); else *epsilon = function(*a2) - function(*a1); fprintf(bisection, "%.4f %.4f %.4f %.4f %.4f\n", a1, a2, fa1, fa2, epsilon); } double function(double a) { double fa; fa = (a * cosh(h / (2 * a))) - R; return fa; } int main() { double a1, a2, fa1, fa2, epsilon; a1 = 0.1; a2 = 0.5; fa1 = function(a1); fa2 = function(a2); if(fa1 - fa2 > 0.0) epsilon = fa1 - fa2; else epsilon = fa2 - fa1; if(epsilon >= 0.00001) { fa1 = function(a1); fa2 = function(a2); attractor(&a1, &a2, &epsilon); fa1 = function(a1); fa2 = function(a2); if(fa1 - fa2 > 0.0) epsilon = fa1 - fa2; else epsilon = fa2 - fa1; } if(epsilon < 0.0001) printf("Vanish at %f", a2); else printf("ERROR"); return 0; } Thanks anyway and sorry if this question is not suitable.

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  • troubles with integration on matlab

    - by user648666
    I'd like some help please I really need to solve this problem. Well before anything thank you for your time... My problem: I have a matrix (826x826 double) and I want to integrate this matrix with respect to a vector of (826x1 double) I don't have the functions of any of this. Is there a command or an algorithm to take the integral of a matrix with respect to a vector? Please I really need help, I'm such a newbie at matlab. Sincerely. George

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  • What's a good way to add a large number of small floats together?

    - by splicer
    Say you have 100000000 32-bit floating point values in an array, and each of these floats has a value between 0.0 and 1.0. If you tried to sum them all up like this result = 0.0; for (i = 0; i < 100000000; i++) { result += array[i]; } you'd run into problems as result gets much larger than 1.0. So what are some of the ways to more accurately perform the summation?

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  • How can I add floats together in different orders, and always get the same total?

    - by splicer
    Let's say I have three 32-bit floating point values, a, b, and c, such that (a + b) + c != a + (b + c). Is there summation algorithm, perhaps similar to Kahan summation, that guarantees that these values can be summed in any order and always arrive at the exact same (fairly accurate) total? I'm looking for the general case (i.e. not a solution that only deals with 3 numbers). Is arbitrary precision arithmetic the only way to go? I'm dealing with very large data sets, so I'd like to avoid the overhead of using arbitrary precision arithmetic if possible. Thanks!

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  • PHP: Is_numeric returns false on 0

    - by Industrial
    Hi everyone, Is_numeric() as well as is_int() returns false if the value is 0. What can i do instead to verify that a specific value is numbers only in PHP? Are we heading straight for the Regular Expressions camp, or are there some nice, handy feature for this out there already? Thanks!

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  • Outer product using CBLAS

    - by The Dude
    I am having trouble utilizing CBLAS to perform an Outer Product. My code is as follows: //===SET UP===// double x1[] = {1,2,3,4}; double x2[] = {1,2,3}; int dx1 = 4; int dx2 = 3; double X[dx1 * dx2]; for (int i = 0; i < (dx1*dx2); i++) {X[i] = 0.0;} //===DO THE OUTER PRODUCT===// cblas_dgemm(CblasRowMajor, CblasNoTrans, CblasTrans, dx1, dx2, 1, 1.0, x1, dx1, x2, 1, 0.0, X, dx1); //===PRINT THE RESULTS===// printf("\nMatrix X (%d x %d) = x1 (*) x2 is:\n", dx1, dx2); for (i=0; i<4; i++) { for (j=0; j<3; j++) { printf ("%lf ", X[j+i*3]); } printf ("\n"); } I get: Matrix X (4 x 3) = x1 (*) x2 is: 1.000000 2.000000 3.000000 0.000000 -1.000000 -2.000000 -3.000000 0.000000 7.000000 14.000000 21.000000 0.000000 But the correct answer is found here: https://www.sharcnet.ca/help/index.php/BLAS_and_CBLAS_Usage_and_Examples I have seen: Efficient computation of kronecker products in C But, it doesn't help me because they don't actually say how to utilize dgemm to actually do this... Any help? What am I doing wrong here?

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  • How do I show a log analysis in Splunk?

    - by Vinod K
    I have made my ubuntu server a centralized log server...I have splunk installed in the /opt directory of the ubuntu server. I have one of the another machines sending logs to this ubuntu server..In the splunk interface i have added in the network ports as UDP port 514...and also have added in the "file and directory" /var/log. The client has also been configured properly...How do I show analysis of the logs??

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  • How can I perform sentiment analysis on extracted text from online sources?

    - by aniket69
    I'm working on extracting the sentiment from YouTube comments, blogs, news content, Facebook wall posts, and Twitter feeds. I'm looking for an automated way to do this: the two third-party solutions I've found have been AlchemyAPI and RapidMiner. Are these the best way to approach this project, or should I be using something else? Is there a more efficient way to approach sentiment analysis? What techniques have worked for you in a project like this?

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  • Are there software options (preferabbly .NET) for doing distance and speed analysis of footballers moving on video?

    - by Anonymous Type
    Editing Question for Clarity Thanks for feedback so far, very insightful. I'm not sure how far along this part of the software community is, and what if any libraries exist for me to leverage from. Heres what I'm trying to do. Problem: Take an existing video of a game of rugby league. The Rugby League field is 100 metres long, 70 metres wide, and has white line markings every 10 metres running along the width of the field, as well as along the sidelines. Each side has 13 players on the field. Players on each team have identical jerseys that normally constrast strongly against background colours (green/brown field colour) and the referee's colour (usually yellow) and the designated water runner (orange). All players have a unique number in thick white lettering on their backs for identification. Video is taken with a high definition camera. Currently only one camera is used (2D) and existing video does not contain a foreground object of fixed spatial dimensions (as suggested in one answer for comparision measurements, however I could add this to future filming sessions if it is worthwhile). The player's do not run in a straight line 50% of the time but will go sideways on on a diagonal to the play the ball. The distance measured always starts from the spot of the previous "tackle", which ends where the player stops forward movement. It is not always possible to determine the players number from the video (facing other direction, sunlight, others standing in the way of the camera). But this isn't important as the software could allow for manual inputting of unknown "runs" at a later point after analysis. Determine the distance between two points (i.e. where the player started his "run" and where he finished it). I'm guessing that this would be quite doable if I manually marked the start and end point in the video. But how would I use landmarks in the background to determine the distance (assuming the person taking the video has kept it from jerking around). Question: Do software packages or libraries exist that are specialised enough to assist with writing analysis software to determine a sports persons distance travelled based on video taken of the performance?

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  • The OLE DB provider "SQLNCLI10.1" has not been registered.; 42000.

    - by lankylad
    I have a SQL Server 2008 Analysis Services Project. In the Data Source View I have a Named Query which references a single Data Source containing three tables. The Project processes successfully and the cube can be browsed. I recently added a second Data Source to the Data Source View and linked a table to the original Named Query. When I try to process the project, I get the message: OLE DB error: OLE DB or ODBC error: The OLE DB provider "SQLNCLI10.1" has not been registered.; 42000. The Connection String for both Data Sources uses SQLNCLI10.1

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  • The OLE DB provider "SQLNCLI10.1" has not been registered.; 42000

    - by lankylad
    I have a SQL Server 2008 Analysis Services Project. In the Data Source View I have a Named Query which references a single Data Source containing three tables. The Project processes successfully and the cube can be browsed. I recently added a second Data Source to the Data Source View and linked a table to the original Named Query. When I try to process the project, I get the message: OLE DB error: OLE DB or ODBC error: The OLE DB provider "SQLNCLI10.1" has not been registered.; 42000. The Connection String for both Data Sources uses SQLNCLI10.1

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  • How do I resolve the error "The file exists" when restoring a cube backup?

    - by Ant
    I'm trying to restore a cube backup (a .abf file) using SQL Server Management Studio, but I'm getting the error message: The following system error occurred: The file exists. . (Microsoft SQL Server 2005 Analysis Services) (yes, there really are two dots) Does anyone know how to resolve this so I can restore the backup? Here are the steps I'm using: Open Microsoft SQL Server Management Studio Make the connection to the AS server Right-click on the Databases node on the server tree view Choose Restore... Type in a new database name in Restore database Select the backup file in From backup file Enter the correct password Optionally tick Allow database overwrite (it happens both ways) Press OK -- get the above error message

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  • How to analyse logs after the site was hacked

    - by Vasiliy Toporov
    One of our web-projects was hacked. Malefactor changed some template files in project and 1 core file of the web-framework (it's one of the famous php-frameworks). We found all corrupted files by git and reverted them. So now I need to find the weak point. With high probability we can say, that it's not the ftp or ssh password abduction. The support specialist of hosting provider (after logs analysis) said that it was the security hole in our code. My questions: 1) What tools should I use, to review access and error logs of Apache? (Our server distro is Debian). 2) Can you write tips of suspicious lines detection in logs? Maybe tutorials or primers of some useful regexps or techniques? 3) How to separate "normal user behavior" from suspicious in logs. 4) Is there any way to preventing attacks in Apache? Thanks for your help.

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  • Web log files analyzer

    - by Peter Štibraný
    I already use Google Analytics on my page, but I'd like to get additional info from log files. I've looked at various packages during last days, but nothing impressed me so far. Some requirements: must work on log file level (I use apache combined logs, but can configure apache to produce other types of logs) can generate static reports (windows/linux) or use GUI (windows only) should be easy to add custom user agents, and rerun analysis if it can recognize installation of eclipse plugins from log, that would be big plus understands google serp position referer should not require two days to setup (awstats, I am looking at you) should be still under active developement (i.e. analog isn't good answer) preferrably free, or at not very expensive :-) Any good analyzers programs out there?

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  • Why is code quality not popular?

    - by Peter Kofler
    I like my code being in order, i.e. properly formatted, readable, designed, tested, checked for bugs, etc. In fact I am fanatic about it. (Maybe even more than fanatic...) But in my experience actions helping code quality are hardly implemented. (By code quality I mean the quality of the code you produce day to day. The whole topic of software quality with development processes and such is much broader and not the scope of this question.) Code quality does not seem popular. Some examples from my experience include Probably every Java developer knows JUnit, almost all languages implement xUnit frameworks, but in all companies I know, only very few proper unit tests existed (if at all). I know that it's not always possible to write unit tests due to technical limitations or pressing deadlines, but in the cases I saw, unit testing would have been an option. If a developer wanted to write some tests for his/her new code, he/she could do so. My conclusion is that developers do not want to write tests. Static code analysis is often played around in small projects, but not really used to enforce coding conventions or find possible errors in enterprise projects. Usually even compiler warnings like potential null pointer access are ignored. Conference speakers and magazines would talk a lot about EJB3.1, OSGI, Cloud and other new technologies, but hardly about new testing technologies or tools, new static code analysis approaches (e.g. SAT solving), development processes helping to maintain higher quality, how some nasty beast of legacy code was brought under test, ... (I did not attend many conferences and it propably looks different for conferences on agile topics, as unit testing and CI and such has a higer value there.) So why is code quality so unpopular/considered boring? EDIT: Thank your for your answers. Most of them concern unit testing (and has been discussed in a related question). But there are lots of other things that can be used to keep code quality high (see related question). Even if you are not able to use unit tests, you could use a daily build, add some static code analysis to your IDE or development process, try pair programming or enforce reviews of critical code.

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  • /analyze flag in Visual Studio 2010 Professional

    - by Martin
    Running Visual Studio 2008 Professional it is possible to enable static code analysis using the /analyze flag (even though this is not supported for the Professional version according to the documentation). In Visual Studio 2010 Professional this no longer works. Instead there is a default /analyze- flag added (one I can't find a GUI setting for). This does not work as well as the VS2008 version (or at all). Can anyone shed some light into this? What does the new /analyze- flag do and is there any way to enable the old analysis?

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  • EXTEND_MODEL_CASES SQL 2005 workaround

    - by user282382
    Hi, I have a time series based mining model in SQL 2005 Analysis Serveries. I understand in 2008 you can do what if analysis by using EXTEND_MODEL_CASES with a Natural Prediction Join. I'm looking for a workaround or some method of doing the same thing but with 2005. My time series has 3 inputs, and one predict_only. I'd like to use the prediction function to see what types of prediction it makes for 6-12 time intervals in the future with inputs in a separate table. Is there any way to do this or something similar? Thanks

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  • assistance with fxcop

    - by amateur
    I am at present developing a mvc4 project that comunicates to a set of wcf services. I am setting such up in tfs build for a team of developers. I am very much a newbie to fxcop and code analysis in general. I am currently researching it and have some questions following this: Is it recommended to use the rules that come with fxcop? Should it be included as a build task during builds? What is the value from it? Are there guidelines to what rules to abide by or is it best to go with the default? Is it correct to run the analysis as a post build event? I am a newbie to fxcop and would like some feedback. I am as it is integrating stylecop in to my build.

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  • Query Execution Failed in Reporting Services reports

    - by Chris Herring
    I have some reporting services reports that talk to Analysis Services and at times they fail with the following error: An error occurred during client rendering. An error has occurred during report processing. Query execution failed for dataset 'AccountManagerAccountManager'. The connection cannot be used while an XmlReader object is open. This occurs sometimes when I change selections in the filter. It also occurs when the machine has been under heavy load and then will consistently error until SSAS is restarted. The log file contains the following error: processing!ReportServer_0-18!738!04/06/2010-11:01:14:: e ERROR: Throwing Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: Query execution failed for dataset 'AccountManagerAccountManager'., ; Info: Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: Query execution failed for dataset 'AccountManagerAccountManager'. ---> System.InvalidOperationException: The connection cannot be used while an XmlReader object is open. at Microsoft.AnalysisServices.AdomdClient.XmlaClient.CheckConnection() at Microsoft.AnalysisServices.AdomdClient.XmlaClient.ExecuteStatement(String statement, IDictionary connectionProperties, IDictionary commandProperties, IDataParameterCollection parameters, Boolean isMdx) at Microsoft.AnalysisServices.AdomdClient.AdomdConnection.XmlaClientProvider.Microsoft.AnalysisServices.AdomdClient.IExecuteProvider.ExecuteTabular(CommandBehavior behavior, ICommandContentProvider contentProvider, AdomdPropertyCollection commandProperties, IDataParameterCollection parameters) at Microsoft.AnalysisServices.AdomdClient.AdomdCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.AnalysisServices.AdomdClient.AdomdCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.ReportingServices.DataExtensions.AdoMdCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.ReportingServices.OnDemandProcessing.RuntimeDataSet.RunDataSetQuery() Can anyone shed light on this issue?

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  • schedule backup and restore of SSAS 2008 database

    - by Manjot
    Hi, I can backup and restore databases on Microsoft SQL server Analysis Service 2008 using GUI as from Backup SSAS I want to schedule backup and restore it to another server every night. so what i did is : I scripted out the backup and restore process from the GUI. Created a new SQL server agent job in database engine and added a "Run SSAS query" step. Copied the scripts to this step. But it fails. the scripts that the GUI copied out look like: <Backup xmlns="http://schemas.microsoft.com/analysisservices/2003/engine"> <Object> <DatabaseID>DB</DatabaseID> </Object> <File>C:\Backup\DB.abf</File> <AllowOverwrite>true</AllowOverwrite> </Backup> <Restore xmlns="http://schemas.microsoft.com/analysisservices/2003/engine"> <File>\\server\C$\Backup\DB.abf</File> <DatabaseName>DB</DatabaseName> <AllowOverwrite>true</AllowOverwrite> </Restore> Any help please?

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  • Query Execution Failed in Reporting Services reports

    - by Chris Herring
    I have some reporting services reports that talk to Analysis Services and at times they fail with the following error: An error occurred during client rendering. An error has occurred during report processing. Query execution failed for dataset 'AccountManagerAccountManager'. The connection cannot be used while an XmlReader object is open. This occurs sometimes when I change selections in the filter. It also occurs when the machine has been under heavy load and then will consistently error until SSAS is restarted. The log file contains the following error: processing!ReportServer_0-18!738!04/06/2010-11:01:14:: e ERROR: Throwing Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: Query execution failed for dataset 'AccountManagerAccountManager'., ; Info: Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: Query execution failed for dataset 'AccountManagerAccountManager'. ---> System.InvalidOperationException: The connection cannot be used while an XmlReader object is open. at Microsoft.AnalysisServices.AdomdClient.XmlaClient.CheckConnection() at Microsoft.AnalysisServices.AdomdClient.XmlaClient.ExecuteStatement(String statement, IDictionary connectionProperties, IDictionary commandProperties, IDataParameterCollection parameters, Boolean isMdx) at Microsoft.AnalysisServices.AdomdClient.AdomdConnection.XmlaClientProvider.Microsoft.AnalysisServices.AdomdClient.IExecuteProvider.ExecuteTabular(CommandBehavior behavior, ICommandContentProvider contentProvider, AdomdPropertyCollection commandProperties, IDataParameterCollection parameters) at Microsoft.AnalysisServices.AdomdClient.AdomdCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.AnalysisServices.AdomdClient.AdomdCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.ReportingServices.DataExtensions.AdoMdCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.ReportingServices.OnDemandProcessing.RuntimeDataSet.RunDataSetQuery() Can anyone shed light on this issue?

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  • What is a name for a job where you do system analysis, project management and data diagramming?

    - by David Archer
    In the last 4 months I've been able to manage a team and step away from the coding for a bit. I've been planning the system in full (both System Analysis and project managing, alongside action and data diagramming) writing the technical documentation, the code's architecture, keeping track of the other guys doing the actual coding, QA, bug reports and dealing with clients. I had to take two days' training on node.js just to see if it would be suitable for a project we were considering. Is there a name for this job? Project Manager and Systems Architect don't quite seem to have the same stuff, and IT manager seems way off. I only want to know so that I can get some qualification towards it and try to move into this kind of work full-time.

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