how to use dbstop if naninf
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I want to ask matlab to stop anywhere in my functions, a variable becomes nan or inf. I defined a function buggy(x) (which is a matlab example in help page of dbstop).
function z = buggy(x)
n = length(x);
u=8/0
z = (1:n)./x;
I just added one line ( u=8/0) to see how dbstop if naninf works. when I ran, matlab started violating. The response is in the following code:
>> dbstop if naninf
>> buggy(3)
u =
Inf
NaN/Inf breakpoint hit for buggy on line 3.
Stopping at next line.
3 u=8/0
4 z = (1:n)./x;
20 if ~isfloat(value)
20 if ~isfloat(value)
399 if numel(var) > numelLimit
20 if ~isfloat(value)
20 if ~isfloat(value)
399 if numel(var) > numelLimit
20 if ~isfloat(value)
20 if ~isfloat(value)
399 if numel(var) > numelLimit
20 if ~isfloat(value)
20 if ~isfloat(value)
399 if numel(var) > numelLimit
20 if ~isfloat(value)
20 if ~isfloat(value)
399 if numel(var) > numelLimit
20 if ~isfloat(value)
20 if ~isfloat(value)
399 if numel(var) > numelLimit
20 if ~isfloat(value)
20 if ~isfloat(value)
399 if numel(var) > numelLimit
20 if ~isfloat(value)
...and continuing...
and matlab stays in debugging mode and if I try doing something in matlab, it freezez.
Am I using dbstop in a wrong syntax or a wrong place?
I want matlab to stop and any inf/nan that that I have produced in my own codes. apparently it stops in its own built-in matlab files as well.
1 commentaire
John Hatrick
le 16 Mar 2018
I have this problem too!
setting 'dbstop if naninf' finds tons of inf statements in MATLAB scripts I'm not using such as 'fsolve.m' and 'trustnleq.m.'
I want to find if a variable goes NaN; I don't care if the phrase 'inf' shows up in a script...
Respectfully, John
Réponse acceptée
Matt J
le 10 Mai 2013
You're definitely not doing anything wrong. It works fine for me. What version of MATLAB is this? Maybe try again after restarting MATLAB? Or maybe try reinstalling.
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