Can you help me please , to resolve this erreur in matlab

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manel maatouk
manel maatouk 2018-5-18
评论： Walter Roberson 2018-5-20
I want to browse a 4D matrix and I got this error message:
Undefined function '_colonobj' for input arguments of type 'double' and attributes 'full 4d real'.
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manel maatouk
manel maatouk 2018-5-20
编辑：Jan 2018-5-20
for ik=1:10 % ik longueur masque
for tt=1:21 % tt le num du theta
t=ttabTheta(tt); % t l'angle theta
for i=1:M
for j=1:N
if(radon_cartesien(ik,tt,i,j)==TabPik_Matrice(ik,tt))
resultatprog(s,1)=i;
resultatprog(s,2)=j;
end
end
end
end
end
[EDITED, Jan, code formatted]
Jan
Jan 2018-5-20
The most important part is not posted: How is M defined?
You overwrite resultatprog(s,1) in each iteration of the 2 inner loops, when the condition is met. Is this really useful?

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回答（1 个）

Jan
Jan 2018-5-19
编辑：Jan 2018-5-20
The error message means, that in your code
for i=1:M
the variable M is a 'full 4d real' (although I do not know, what this means). Check how M is defined and adjust it to be a double. Maybe this is working already:
for i=1:double(M)
[EDITED] Walter has explained the error message: M is a 4D array, but the colon operator expects a scalar. Then I guess you want:
for i = 1:size(radon_cartesien, 3)
for j = 1:size(radon_cartesien, 4)
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Jan
Jan 2018-5-20
编辑：Jan 2018-5-20
@Walter: Thank you very much. I'm confused:
X = rand(2,3);
Y = rand(2,3,4,5);
1:X % Silently uses the 1st element only, no error
1:Y % Error:
Undefined function 'colon' for input arguments of type 'double'
and attributes 'full 4d real'.
After your explanation I understand the message. But if Matlab catches this problem for multi-dimensional arrays, I cannot understand, why there is no error for the 2D case. This:
for k = 1:size(X)
causes problems repeatedly and you find several concerning threads in this forum.
Walter Roberson
Walter Roberson 2018-5-20
In the past I have seen it documented that the first value will be silently used (at least under some circumstances) but I do not see that documentation at present.

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