MATLAB Coder Error : Output argument 'b' is not assigned on some execution paths? Help!
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Hiroshi Nakamura
il 28 Feb 2015
Commentato: Hiroshi Nakamura
il 2 Mar 2015
Hello guys! I am trying to convert the following code into C using MATLAB Coder and keep getting the same error which makes no sense to me because the code works fine on MATLAB.It keeps telling me 'Output argument 'b' is not assigned on some execution paths'.. What does it mean? Here's my code:-
function [ b ] = dct2C( M,N )
a = [1 2 3 4; 2 3 4 5; 3 4 5 6; 4 5 6 7];
c = [1 2; 3 4]
q_mtx = [16 11; 12 12];
for x = 1:2:M
for y = 1:2:N
b = a(x:x+1, y:y+1);
b = c*b*c';
b = b./q_mtx ;
a(x:x+1, y:y+1) = b;
end
end
end
2 Commenti
Geoff Hayes
il 1 Mar 2015
Hiroshi - why do you the following assignment
a(x:x+1, y:y+1) = b;
but then don't return a?
Risposta accettata
Image Analyst
il 1 Mar 2015
It's saying that because it doesn't know what you're going to pass in for M and N. What if you passed in -30 and -5000? Would b get assigned? No, because the loop would never execute. Assign b to something just before the loop, like an error condition value like -1 or something.
b = -1; % Default if the loops never get entered.
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