creating matrix with the same size for different variables

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sadek kouz
sadek kouz 2019-3-10
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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采纳的回答

Star Strider
Star Strider 2019-3-10
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
Experiment to get the result you want.

更多回答（1 个）

sadek kouz
sadek kouz 2019-3-10
thank you that helps a lot

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