MATLAB Answers


How to stop on a variable getting a specific value?

Asked by Evgeny Bespechansky on 30 Apr 2019
Latest activity Commented on by dpb
on 1 May 2019
Accepted Answer by dpb
I have a variable that can change its value in multiple locations within a long function.
For debugging purposes I want to stop-in-debug once this variable gets a specific value.
I could go throughout the code and set a conditional breakpoint in each line it can happen, but I wonder, if there is a way to set a "global" conditional breakpoint?


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1 Answers

Answer by dpb
on 30 Apr 2019
Edited by dpb
on 30 Apr 2019
 Accepted Answer

dbstop in file at if expression
is best you can do I don't have to manually insert the breakpoint at every line but would have to get the line numbers and put into a little script to run...a little grep utility could possibly be invoked to build/retrieve the lines in the m-file with an assignment to the subject variable name???
I've long thought the debugger should have a watch facility besides...


You seem to be right.
Without the "at" statement the condition fails - it is defined for the variable that is undefined at the beggining of the function. So I have to execute something like
for i=61:200
cLine = sprintf('dbstop in myFunc.m at %d if myVar>X', i);
It looks ugly and not much easier than to search the code for every line where myVar can change its value and set a breakpoint manually...
Excepting you could build a function that hides the ugly to invoke...

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