MATLAB Programming Fundamentals - MathWorks

To examine values at increments in a for loop, set the breakpoint within the loop, rather

than at the start of the loop. If you set the breakpoint at the start of the for loop, and then

step through the file, MATLAB pauses at the for statement only once. However, if you

place the breakpoint within the loop, MATLAB pauses at each pass through the loop.

Conditional Breakpoints

A conditional breakpoint causes MATLAB to pause at a specified line in a file only when

the specified condition is met. Use conditional breakpoints when you want to examine

results after some iterations in a loop.

To set a conditional breakpoint, right-click the breakpoint alley at an executable line

where you want to set the breakpoint and select Set/Modify Condition.

When the Editor dialog box opens, enter a condition and click OK. A condition is any valid

MATLAB expression that returns a logical scalar value.

As noted in the dialog box, MATLAB evaluates the condition before running the line. For

example, suppose that you have a file called myprogram.m.

Add a breakpoint with the following condition at line 6:

n >= 4

A yellow, conditional breakpoint icon appears in the breakpoint alley at that line.

22 Debugging MATLAB Code