How to create an array

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JRC
JRC 2017-7-19
评论： Star Strider 2017-7-19
How to create an array
A = [0 0 0 0; 1 1 1 1; 2 2 2 2; 3 3 3 3; 4 4 4 4]
using the command "for" or other?

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Star Strider
Star Strider 2017-7-19
Use the repmat function:
A = repmat(0:4, 4, 1)';
A =
0 0 0 0
1 1 1 1
2 2 2 2
3 3 3 3
4 4 4 4
  2 个评论
JRC
JRC 2017-7-19
Perfect Star Strider!
I didn´t know the command "repmat".
Thank you.
Star Strider
Star Strider 2017-7-19
As always, my pleasure!
Another option for your particular problem is to use element-wise vector multiplication:
A = [0:4]'.*ones(1,4);
See the documentation on Array vs. Matrix Operations (link) for details.

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