Assign values to empty matrix

Question

Mridul Garg 2016-7-17

0
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https://ww2.mathworks.cn/matlabcentral/answers/296030-assign-values-to-empty-matrix

评论： Mridul Garg 2016-7-17

Hello

I want to create an empty matrix of unknown rows and known columns, then run a loop and assign values to it iteratively. So for example, my code should be something like-

   result=zeros(10,3);
   for i=1:10
   num=1;file=i;
   result(i,1)=strcat(num,'_',file);
   result(i,2)=tp; % result of some calculation
   result(i,3)=delay; % result of another calculation;
   end;

Matrices in matlab cannot have both string and numeric types, so how do I proceed doing this?

Thanks in advance!

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Answer 1

Azzi Abdelmalek 2016-7-17

1
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https://ww2.mathworks.cn/matlabcentral/answers/296030-assign-values-to-empty-matrix#answer_228869

编辑：Azzi Abdelmalek 2016-7-17

在 MATLAB Online 中打开

You can use cell arrays

A={1 2 'abc' 'efg' [1 2;3 4] [] ''}

Remarque: result=zeros(10,3); is not an empty matrix. With cell arrays you cen write:

result=cell(10,3)
for i=1:10
 num=1;
 file=i;
 result{i,1}=sprintf('%d_%d',num,file);
 tp=rand;
 delay=rand;
 result{i,2}=tp; % result of some calculation
 result{i,3}=delay; % result of another calculation;
end;
result