Using conditional breakpoints to print out value
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Hi, I'm interested if it would be possible to use/abuse(?) conditional breakpoints to print out the value of a variable to the command window. Sometimes I work with a codebase that is read-only, so I can't insert 'disp()' statements... Thanks!
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Jonathan Sullivan
2013-2-12
Yes sir. It takes a bit of creativity.
Here's an example. Let's print out "Hi" each time mod(ii,2) == 0.
iff(mod(ii,2),fprintf('Hi.\n') > 0,false)
This will pause the code execution. If you prefer to not pause the code execusion, try:
iff(mod(ii,2),fprintf('Hi.\n') == NaN,false)
Where iff is defined as follows:
function out = iff(cond,vtrue,vfalse)
if cond
out = vtrue;
else
out = vfalse;
end
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per isakson
2013-2-12
编辑:per isakson
2013-2-12
The function invoked at the conditional break point shall always return true and not error. Printing should be fine. If the name of variable isn't known beforehand one may use whos/who.
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Matt J
2013-2-11
编辑:Matt J
2013-2-11
Once the code stops at breakpoint, you can highlight a variable or expression in the editor window. Then right-click and select "Evaluate Selection".
You should also be able to see the value of a variable by hovering the mouse over any occurrence of it in the editor.
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