Customize dbstop in MATLAB

Question

Is it possible to add a customized dbstop condition to Matlab?

Recently I found myself with out of bounds values in multiple variables, one way to track down the first occurance of this would be to set a conditional breakpoint on each line where these values are updated. However, I hope there is an easier way to do this.

I have recently had to track down a NaN which was fairly trivial due to:

dbstop if naninf

Hence I hope that it is possible to get something like:

dbstop if anything outside myBound

or

dbstop if myVariable outside myBound

I would of course be willing to take the performance hit that one may expect.

Answer 1

If you use the editor, you can set a stop as normal, right-click on it, select "set/modify condition" and enter the condition (the stop will turn from red to yellow).

From command line, you can use

dbstop in file if expression
dbstop in file at location if expression

e.g.
dbstop in myFile at 200 if (~isempty(var) && var > 3)

as mentioned by @LuisMendo.

The second option may be more useful, since the first one seems to be only evaluated at the start of the file. In other words, it doesn't seem to be possible to have a similarly generic expression as dbstop if naninf that checks for certain values across an entire file.