A few differences: print vs println:The print function prints messages in the Xcode console when debugging apps.The println is a variation of this that was removed in Swift 2 and is not used any more. If you see old code that is using println, you can now safely replace it with print.Back in Swift 1.x, print did not add newline characters at the end of … Read more
NOTE: This error is almost always caused because the command does not exist, because the working directory does not exist, or from a windows-only bug. I found a particular easy way to get the idea of the root cause of: The problem of this error is, there is really little information in the error message … Read more
ESP is the current stack pointer. EBP is the base pointer for the current stack frame. When you call a function, typically space is reserved on the stack for local variables. This space is usually referenced via EBP (all local variables and function parameters are a known constant offset from this register for the duration … Read more
Compile your application with -g, then you’ll have debug symbols in the binary file. Use gdb to open the gdb console. Use file and pass it your application’s binary file in the console. Use run and pass in any arguments your application needs to start. Do something to cause a Segmentation Fault. Type bt in the gdb console to get a stack trace of the Segmentation Fault.
The problem: actionlist$RPos[1000] has a value of 21. n1 ranges from -31 to 0. When you add them you get a vector with a mix of positive and negative values, which isn’t allowed in subsetting. How I got there: First check traceback(): This tells me the problem is in actionlist$RPos[i] + n1 most likely. Then I just added a simple print(i) statement to tell … Read more
You can safely use the typeof operator on undefined variables. If it has been assigned any value, including null, typeof will return something other than undefined. typeof always returns a string. Therefore
One possible cause, it that you’ve enabled the “pause on exceptions” (the little stop-sign shaped icon with the pause (||) symbol within in the lower left of the window). Try clicking that back to the off/grey state (not red nor blue states) and reload the page.
Firefox On Firefox you can use an extension called FirePHP which enables the logging and dumping of information from your PHP applications to the console. This is an addon to the awesome web development extension Firebug. http://www.studytrails.com/blog/using-firephp-in-firefox-to-debug-php/ Chrome However if you are using Chrome there is a PHP debugging tool called Chrome Logger or webug (webug has problems with the order of … Read more
With a debugger you can step through the program assembly interactively.With a disassembler, you can view the program assembly in more detail.With a decompiler, you can turn a program back into partial source code, assuming you know what it was written in (which you can find out with free tools such as PEiD – if … Read more