dbstop within a condition

Looking to use dbstop if I get into an if statement, so that a break point will be added to next line. I'm presently doing this by the following:

if StoredTextSettings{end,8} < StoredTextSettings{end,7}
  dbstop at 67
  pause(0.001)
end

where the pause(0.001) is line 67. What I want to do is to have location set as a variable so that I can edit code without having to change the hard-coded line "at location". I want to have something like:

 if StoredTextSettings{end,8} < StoredTextSettings{end,7}
   PresentLine = MFileLineNr(); % Fex function to get present line number
   dpstop at PresentLine + 2
  pause(0.001)
end

This will enable the code to be modified before the hardcoded line number(s) and should I exit matlab and forget to enable my own break point (presently how I do things, or just let error on dbstop() then have to repeat the code run (having enabled pausing on errors), which is obviously terrible programming! I've tried:

dbstop if StoredTextSettings{end,8} < StoredTextSettings{end,7}

but this didn't work as I thought it would, and neither of the following get the desired result

dbstop in TestDBStop if StoredTextSettings{end,8} < StoredTextSettings{end,7}
dbstop in TestDBStop.m if StoredTextSettings{end,8} < StoredTextSettings{end,7}

Anyone any tips on how to implement what I want (encounter a condition, and then enable a break point in that condition when the line number may change)? Thanks in advance

Answer 1

[Sean de Wolski]

I think keyboard() does exactly what you want. It just stops at that line in debug mode.

But to find the number, I'd consider doing a contains() on the rows of a file after reading it in with fileread().

So

T = contains(string(fileread(mfilename)));
rownum = find(contains(T, '<Stop Here>'));

Now the row is:

pause(0.01) % <Stop Here>

[Pete]

Thanks Sean, exactly what I wanted! For those who are looking at something similar, use the following in the code:

if StoredTextSettings{end,8} < StoredTextSettings{end,7}
  keyboard
end

This then opens up a DB point and allows you to continue as before.

Amazingly simple!