Number of variables vary in function definition

Question

Lenilein 2020-2-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/503841-number-of-variables-vary-in-function-definition

评论： Lenilein 2020-2-5

Hello,

I tried looking at following problem under all angles but couldn't find a solution: I have a matrix A with n number of rows and p columns. Whereas the number of columns is fixed, the number of rows is dependant on a parameter. I want to concatenate the values of each column to one element and this formula would give me the output that I wish if the number of rows is 5:

X = arrayfun(@(x,y,z,w,v) (strcat(num2str(x),num2str(y),num2str(z),num2str(w),num2str(v))),A(1,:),A(2,:),A(3,:),A(4,:),A(5,:),'un',0);

However, in my case the number of rows varies and therefore the number of variables x,y etc. vary as well.

Do you know a way to automatically adjust the number of variables and the rest of parameters (num2str(x), A(1,:), etc.) accordingly? I suspect this could be possible with a loop but couldn't find the way to do it.

Thanks!

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Answer 1

the cyclist 2020-2-5

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https://ww2.mathworks.cn/matlabcentral/answers/503841-number-of-variables-vary-in-function-definition#answer_413981

Here is a different approach, using a loop and sprintf:

% Count columns and preallocate X
numberCols = size(A,2);
X1 = cell(1,numberCols);
% Fill cell with desired strings
for nc = 1:numberCols
    X1{nc} = sprintf('%d',A(:,nc));
end