When I debug long pieces of numerical code, often I want to see the function variable values if something happens, or in an specific iteration. Generally I do:
function banana(platano)
% long stuff here
for ii=1:123456789
% tons of maths
if ii==45612
stophere=1; % I put a break point in this line of code
end
end
However, this requires me to write code in the function for debugging and it doesn't look nice. Is there a smarter way of doing this?
One of the ways is using Conditional Breakpoints. You can add them by right clicking on the number of the line and selecting the "Set conditional Breakpoints..." option.
Example:
As described in the comments of this answer, if you want to set it with the command line you can use
dbstop in filename at linenumber if condition
As an example:
dbstop in banana at 6 if ii==454345433
note, that the at linenumber and if condition are optional.
Another useful tool of the debugger is breaking the program if there has been an error, using dbstop if error, as show in this Q&A.
Thanks to @Dev-il for showing me this!
if statements and paused the code that way. BTW, it would be even better if you could show how to do this via command-line through the command prompt rather than using the editor. Is this possible?
dbstop in file if condition
dbstop in banana at 8 if ii==454345433