interpret a simple matrix code

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Ann Lee
Ann Lee on 29 Apr 2022
Commented: Ann Lee on 29 Apr 2022
I m interpret a very easy code...
I don't know some points, could you explain green sentences?
>> A=eye(4,4)
A =
Diagonal Matrix
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1
>> for x=(1:2:3) %what is this mean x=(1:2:3)
A(x,x)=x+1; % first x is line and second x is row right? hence it means (1,1), (2,2), (3,3),(4,4)
end
>> A
A =
Diagonal Matrix
2 0 0 0
0 1 0 0
0 0 4 0
0 0 0 1

Accepted Answer

Jan
Jan on 29 Apr 2022
I recommend to use the free Matlab tutorials to learn the basics: https://www.mathworks.com/learn/tutorials/matlab-onramp.html
Read the "Getting Started" chapters of the documentation also.
If you have a question about a for loop, read:
help for
doc for
Here your find what a:b:c means: "initVal:step:endVal"
"hence it means (1,1), (2,2), (3,3),(4,4)" - almost correct: The loop stops at 3, so (4,4) is not included.
  1 Comment
Ann Lee
Ann Lee on 29 Apr 2022
thank you! i'll read that tutorials!

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