write this following matrix

2020 5 7
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更新时间：2020 5 16
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How can I write the following matrix
I define n=100
And I generate the following code
D= toeplitz ([0 1 zeros(1, n-2) -1]/ (2*h))
but I get wrong matrix. How can I correct it?

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Sindar
Sindar 2020-5-7
try diag (good for small problems) or spdiag (better examples)
Zeynep Toprak
Zeynep Toprak 2020-5-7
please can you write in a clear way. I am new learner of matlab, and I try to learn it by myself. So, I do not know how to use what you said. Thanks a lot.
Sindar
Sindar 2020-5-7
click the links and read the examples
Sindar
Sindar 2020-5-7
Also, try this general tutorial: https://www.mathworks.com/learn/tutorials/matlab-onramp.html
I'd been using Matlab for years and still found it useful
Zeynep Toprak
Zeynep Toprak 2020-5-7
okay, thanks for helping, but it is very difficult. Thanks a lot again.
Gokberk Yildirim
Gokberk Yildirim 2020-5-16
Actually, it can be done with this Zeynep.
c = [0 -1 zeros(1,n-3)];
r = [0 1 zeros(1,n-3)];
D = toeplitz(c,r) / (2*h)

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John D'Errico
John D'Errico 2020-5-7
编辑：John D'Errico 2020-5-7

0 个投票

Try this:
n = 100;
D = (diag(ones(n-1,1),1) - diag(ones(n-1,1),-1))/(2*h);
You can also use spdiags. or sparse, or many other tools. But diag as I did it above is about the simplest way.

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Zeynep Toprak
Zeynep Toprak 2020-5-7
Many thanks for your great help!! :) I use this matrix in this question my question is here. But I get an error message. Please can you take a look at it? (This is not assignment or something else like this. On these lockdown days, I try to learn matlab by myself, and I have no one to ask or to learn) Many thanks again.

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