Write matrix or array without overwriting

Question

Dion Theunissen 2021-2-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/749107-write-matrix-or-array-without-overwriting

评论： Walter Roberson 2021-2-18

Hi,

I am getting a parameter called 'test' in a for loop. I want to write it to a matrix or array without overwriting. Each loop has a different dimension so that makes it a bit complicated.

I need on line h 'r' values of test, line h the new 'r' values of test and so on. So test needs to come in row h, column r.

for h = 3:10
   ...
 ...
...
A = []
for r = 1:g
...
    for m = 1:numbcenterlines
... 
     percentage(m) = sum(distance>0 & distance <1) / numel(distance)*100;
     test = max(percentage,[],'all');
    end
    A(r,h) = [A;test] %this part doesn't work well so my question is how to fix this part and get an array here with all the test values without overwriting
end 
end

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Answer 1

Stephen23 2021-2-18

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https://ww2.mathworks.cn/matlabcentral/answers/749107-write-matrix-or-array-without-overwriting#answer_626787

在 MATLAB Online 中打开

You are mixing up two different approaches to adding data in a loop: concatenation and indexing. Just pick one, e.g.:

A = [A;test];

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Dion Theunissen 2021-2-18

在 MATLAB Online 中打开

A =
         0         0   67.9666
         0         0   57.2263
         0         0   73.3220
         0         0   19.6101
         0         0   21.3058
         0         0   88.3791
         0         0   78.7196
         
 A =
         0         0         0   36.5854
         0         0         0   36.5854
         0         0         0   36.5854
         0         0         0   36.5854
         0         0         0   36.5854
         0         0         0   36.5854
         0         0         0   36.5854