creating matrix with the same size for different variables

Question

sadek kouz 2019-3-10

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/449264-creating-matrix-with-the-same-size-for-different-variables

评论： Star Strider 2019-3-10

hello

i want to creat N number of matrix 2x2 from different variabless then plottting the elemnt (2,1)./(1,1) using for loop but it i always get the last matrix only which overwrite all the previous ones.

who can help me please ?

x=linspace(eps,pi/2,200)
D11=1+sin(x)-cos(x);
D12=1-sin(x)-cos(x);
D21=1-sin(x)+cos(x);
D22=1+sin(x)+cos(x);
for i=1:numel(x)
D=0.5.*[D11(1,i) D12(1,i) ; D21(1,i) D22(1,i)];
end
plot(D(2,1)./D(1,1),x)

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Answer 1

Star Strider 2019-3-10

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/449264-creating-matrix-with-the-same-size-for-different-variables#answer_364673

在 MATLAB Online 中打开

Try this:

x=linspace(eps,pi/2,200);
D11=1+sin(x)-cos(x);
D12=1-sin(x)-cos(x);
D21=1-sin(x)+cos(x);
D22=1+sin(x)+cos(x);
for i=1:numel(x)
    D(:,:,i) = 0.5.*[D11(1,i) D12(1,i) ; D21(1,i) D22(1,i)];
end
figure
semilogy(x, squeeze(D(2,1,:)./D(1,1,:)))
grid