How do I write a sparse matrix in MATLAB

2020 12 15
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更新时间：2020 12 16
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Shlesha Van
Shlesha Van 2020-12-15
That gives solutions on how to convert a full matrix into sparse. My case is opposite. I want to convert a sparse into full

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Daniel Pollard
Daniel Pollard 2020-12-15
编辑：Daniel Pollard 2020-12-15

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https://uk.mathworks.com/help/matlab/ref/full.html

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Shlesha Van
Shlesha Van 2020-12-15
Thanks Daniel, but how do I type this matrix in Matlab?
I tried A = [ 2 -1 0 ... 0;]; but everything after ... turns green.
Daniel Pollard
Daniel Pollard 2020-12-15
An ellipsis ... has a very specific meaning in Matlab. If you type it in, it interprets that to mean "the next line is a continuation of this line". It does not mean "fill in the numbers here". A sparse matrix is a specific thing, and if you try to enter exactly the A in your question into Matlab, you'll have a bad time. I recommend reading the documentation to get a clearer idea of what's going on.
Jan
Jan 2020-12-16
The first two inputs of sparse() are the size of the matrix. As the error message tells you, [2,-1,0] cannot be a valid size. See the documentation of sparse :
doc sparse

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Jan
Jan 2020-12-15

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You want to convert a sparse matrix into a full one? Then use the command: full().

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Shlesha Van
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2020-12-15

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Jan
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