storing values of for loop in a matrix

Question

Sumera Yamin 2021-2-2

0
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评论： Sumera Yamin 2021-2-2

Hi, i have a basic problem. i am using nested for loops x and y and calculating variable z. the variable z is over written at each iteration. at the end of loops, i want to have the variable z matrix. The x is 1xm vector, and y=1xn vector, how would i get the data matrix for z, where z=mxn. i use a simple test code below. Many thanks for any help

x=-60:0.5:-50;
y=-10:0.5:-5;
z=[];
for i=1:length(x)
    for j=1:length(y)
        z=x(i)+y(j)
    end
end

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Answer 1

Stephen23 2021-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/734255-storing-values-of-for-loop-in-a-matrix#answer_613070

编辑：Stephen23 2021-2-2

在 MATLAB Online 中打开

x = -60:0.5:-50;
y = -10:0.5:-5;
z = nan(numel(x),numel(y)); % better to preallocate array.
for i = 1:numel(x)
    for j = 1:numel(y)
        z(i,j) = x(i)+y(j); % indexing to allocate value to z.
    end
end