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Statalist The Stata Blog Web resources Author Support Program Installation Qualification Tool Disciplines Company StataCorp Contact us Hours of operation Announcements Customer service Register Stata online Change registration Change address Subscribe to Stata News Subscribe to email alerts International resellers Careers Our sites Statalist The Stata Blog Stata Press Stata Journal Advanced search rstudio Site index Purchase Products Training Support Company >> Home >> Resources & support >> FAQs >> Debugging your program How do I debug my program? Title Debugging your program Author Shannon Driver, StataCorp One of the most useful tools in Stata for debugging programs is set trace. By default, set trace is turned off. To use it, simply type . set trace on and run the program again. You will see lots of output, as Stata will display each line from each ado-file that it runs. If the program you are debugging is giving you an error message and exiting, the error message will appear in the trace output after the last line that Stata attempted to execute. Because you know which line is causing the error, you may immediately recognize what is wrong, and then make a change to your program. If you cannot immediately recognize what is wrong, you might be interested in customizing the

when an error occurs Using the debugger Environment pane Code window Console Debugging commands Special circumstances Debugging outside functions Debugging in packages Debugging in Shiny applications Debugging in R Markdown documents r if else Further Reading Introduction Debugging in R is a broad topic. In this article, download r studio we focus specifically on the R debugging tools built into RStudio; for more general advice on debugging in R (such debugging as philosophy and problem-solving strategies), we recommend this resource from Hadley Wickham: Debugging, condition handling, and defensive programming In a very general sense, debugging is designed to help you find bugs by figuring http://www.stata.com/support/faqs/programming/debugging-program/ out where the code is not behaving in the way that you expect. To do this, you need to: Begin running the code Stop the code at the point where you suspect the problem is arising, and Look at and/or walk through the code, step-by-step at that point. We’ll look at these last two tasks in detail. Entering debug mode (stopping) In order to enter https://support.rstudio.com/hc/en-us/articles/205612627-Debugging-with-RStudio debug mode, you’ll need to tell R when you want to pause the computation. R doesn’t have a “pause now” feature (and most computations are so fast that such a feature would not be helpful!). Instead, you’ll want to “set your traps” prior to starting your computation. There are several ways to do this; pick one that corresponds best to your problem. Stopping on a line Editor breakpoints The most common (and easiest) way to stop on a line of code is to set a breakpoint on that line. You can do this in RStudio by clicking to the left of the line number in the editor, or by pressing Shift+F9 with your cursor on the desired line. We call this an “editor breakpoint”. Editor breakpoints take effect immediately and don’t require you to change your code (unlike browser() breakpoints, below). Editor breakpoints work by injecting some tracing code into the R function object. R function objects that include this tracing code have a red dot in the environment pane, indicating that they contain breakpoints. If the function object doesn’t exist yet (for instance, because you haven’t called source() on the file), or the fun

resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events https://msdn.microsoft.com/en-us/library/dd565625(v=vs.85).aspx Community Magazine Forums Blogs Channel 9 Documentation APIs and reference http://blog.teamtreehouse.com/how-to-debug-in-php Dev centers Samples Retired content We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. MSDN Library MSDN Library MSDN Library MSDN Library Design Tools Development Tools and Languages Mobile and Embedded Development .NET Development line error Office development Online Services Open Specifications patterns & practices Servers and Enterprise Development Speech Technologies Web Development Windows Desktop App Development TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. Debugging Script line error debug with the Developer Tools This content refers to an older version of F12 developer tools. Please visit our latest F12 tools documentation. The Developer Tools feature of Windows Internet Explorer 8 offers a built-in, lightweight Microsoft JScript debugger that enables developers to set breakpoints and to step through client-side JScript code without leaving the browser. This document outlines the high-level features of the JScript debugger. To get acquainted with the other features of the Internet Explorer 8 Developer Tools, refer to Discovering Internet Explorer Developer Tools; to get a complete reference of the Developer Tools interface commands, refer to Developer Tools User Interface Reference. Introduction Start Debugging Setting Breakpoints Controlling Execution Inspecting Variables Inspecting Call Stack Using Console to Execute Code Statements Using Console for Logging Alerts and Error Messages Remarks Related topics Introduction JScript debugging is a critical part of Web development. With the intuitive, lightweight JScript debugger, the Developer Tools feature brings one-click simplicity

and found it very interesting, thought it might be something for you. The article is called How to Debug in PHP and is located at http://blog.teamtreehouse.com/how-to-debug-in-php.CaptchaSubmitNobody enjoys the process of debugging their code. If you want to build killer web apps though, it's vital that you understand the process thoroughly. This article breaks down the fundamentals of debugging in PHP, helps you understand PHP's error messages and introduces you to some useful tools to help make the process a little less painful. Doing your Ground Work It is important that you configure PHP correctly and write your code in such a way that it produces meaningful errors at the right time. For example, it is generally good practice to turn on a verbose level of error reporting on your development platform. This probably isn't such a great idea, however, on your production server(s). In a live environment you neither want to confuse a genuine user or give malicious users too much information about the inner-workings of your site. So, with that in mind lets talk about the all too common "I'm getting no error message" issue. This is normally caused by a syntax error on a platform where the developer has not done their ground work properly. First, you should turn display_errors on. This can be done either in your php.ini file or at the head of your code like this: ini_set('display_errors', 'On'); Tip: In these code examples I omit the closing (?>) PHP tag. It is generally considered good practice to do so in files which contain only PHP code in order to avoid accidental injection of white space and the all too common "headers already sent" error. Next, you will need to set an error reporting level. As default PHP 4 and 5 do not show PHP notices which can be important in debugging your code (more on that shortly). Notices are generated by PHP whether they are displayed or not, so deploying code with twenty notices being generated has an impact upon the overhead of your site. So, to ensure notices are displayed, set your error reporting level either in your php.ini or amend your runtime code to look like this: ini_set('display_errors', 'On');
error_reporting(E_ALL); Tip: E_ALL is a constant so don't make the mistake of enclosing it in quotation marks. With PHP 5 it's also a good idea to turn on the E_STRICT level of error reporting. E_STRICT is useful for ensuring you're coding using th