How to stop on a variable getting a specific value?

2019 4 30
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更新时间：2019 5 1
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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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dpb
dpb 2019-4-30
编辑：dpb 2019-4-30

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dbstop in file at if expression
is best you can do I think...you 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???
ADDENDUM:
I've long thought the debugger should have a watch facility besides...

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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);
eval(cLine);
end
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...
dpb
dpb 2019-5-1
Excepting you could build a function that hides the ugly to invoke...

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