- "But no operation is happening"   what do you expect to happen?
- "it completely runs without any error"   if so "not getting anything as disp in command window" is what to expect from this code
This MATLAB code for try catch not works properly.
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try
boxPairs = matchFeatures(data1, data2);
catch
if boxPairs == 0
disp('there was an error')
else
plot(x,y)
end
end
This is the part of my program.
When i run above code, it completely runs without any error. But no operation is happening,. I checked my workspace. I am getting
boxPairs = 0
but i am not getting anything as disp in command window. What changes needed in program.?
1 commentaire
per isakson
le 17 Fév 2015
Réponse acceptée
Dima Lisin
le 19 Fév 2015
Modifié(e) : Dima Lisin
le 19 Fév 2015
Hi Nimisha,
boxPairs can never be equal to 0. boxPairs is an M-by-2 matrix containing the indices of matched features. However, if no matches were found, then boxPairs is empty. So your error checking should look like this:
boxPairs = matchFeatures(data1, data2);
if isempty(boxPairs)
disp('No matches found')
else
plot(x,y)
end
The error you are getting comes from the estimateGeometricTransform, because it is getting empty points, because boxPairs was empty.
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Plus de réponses (1)
Guillaume
le 17 Fév 2015
I think you've not understood how try ... catch ... end works. The code between try and catch will run until it encounters an error. By error, I mean something that stops the code running (usually an error instruction) and results in a red error message at the command line. When that happens, the code inside the catch ... end executes. However, if no error happens the body of the catch| is never executed.
If matchFeatures would create an error, then boxPairs would not even exists (unless it's predeclared before the try). Therefore your if statement inside the catch would be itself an error, trying to access an undeclared variable.
Most likely what happens is that matchFeatures returns 0 but does not error, so the catch statements are not executed, and your program ends. Maybe you meant just this:
boxPairs = matchFeatures(data1, data2);
if boxPairs == 0
disp('there was an error')
else
plot(x,y)
end
4 commentaires
Guillaume
le 19 Fév 2015
I would suggest you start a new question as what you're now asking hasn't got anything to do with the title of the question. People familiar with the subject may not look at this question because of its title.
Unfortunately, as I've said, I don't know anything about the computer vision toolbox, so can't help you there.
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