For loop with if statement!

Question

Sophia 2019-9-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/482532-for-loop-with-if-statement

回答： the cyclist 2019-9-27

Here is the samplf of what i am trying to do-

clear all;
clc;
 
s = [1 2 3; 4 0.5 1; 1.3 2 1; 1.5 1.6 2.8]
 
a(1,:,:)  = [ 1 2 3 ; 4 5 6; 7 8 9;10 11 12]
 
a(2,:,:)  = [ 11 12 13 ; 14 15 16; 17 18 19;110 111 112]
 
a(3,:,:)  = [ 111 112 113 ; 114 115 116; 117 118 119;1110 1111 1112]
 
dd= []
for i = 1:size(a,1)
    for j = 1:size(a,2)
        for k = 1:size(a,3)
            if s(j,k)>1.5
                dd(:,:) = double(a(:,j,k));
            else
            end     
        end
    end
end
 
%Expected Answer dd = [2 3 4 8 11 12; 12 13 14 18 111 112;112 113 114 118 1111 1112];

Can anyone tell me how to get the expected answer, i created this sample to understand the problem with some simplicity.

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Ahmed Zankoor 2019-9-27

在 MATLAB Online 中打开

Firstly, you get an assignment error for matrix a. But it works if you initialize the matrix

a = zeros(3,4,3);
a(1,:,:)  = [ 1 2 3 ; 4 5 6; 7 8 9;10 11 12]
 
a(2,:,:)  = [ 11 12 13 ; 14 15 16; 17 18 19;110 111 112]
 
a(3,:,:)  = [ 111 112 113 ; 114 115 116; 117 118 119;1110 1111 1112]

The second part is not clear at all.

a(:,j,k) is a 3*1 vector, so you can not form dd like your expected answer.
dd should be initialized so that you can assign different values at differnt positions.

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