debug parent from child

[ahowe42]

Hello everyone

I have occasionally had the need to have a breakpoint dynamically inserted
in a function/script to identify situations that don't occur with every run
(usually because of simulations).  This is easy to do with something like
this:

if *test condition*
[st,ind] = dbstack; feval("dbstop",st(ind).name,st(ind).line+1)
disp('situation occurred')
end

Since this can be so useful, I decided to write a function to do this that I
could just call inside my if branch (hence generalizing the dynamic debug). 
However, from much testing it seems that dbstop cannot put a breakpoint on a
parent in the stack.  The breakpoint is actually applied in the child
function.

My parent function (for testing) uses this code:

/if 1 == 1
        DebugTest;
        1/1;
end/

and the DebugTest function is:

/function DebugTest
% get the current execution stack up to the calling function
[st,ind] = dbstack;
% now place the break point at the next execution line
feval("dbstop",st(ind+1).name,st(ind+1).line+1);/

Since dbstop is a built-in function, I can't place a breakpoint to debug it
:-).  I'll try to check the sourcecode to figure out what's going on, but
wondered if anyone had any ideas about it?

Thanks.

Andrew


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