# How to add lower triangle of zeros/indent to each row, in a matrix?

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Amanda on 25 Apr 2021
Commented: Amanda on 25 Apr 2021
I have this matrix:
1 2 3 4 5 6 7 8 5 5
3 3 3 3 3 4 4 4 5 5
1 4 3 4 3 4 4 4 5 5
3 3 3 3 4 4 4 5 5 5
And I want this as the result:
1 2 3 4 5 6 7 8 5 5 0 0 0
0 3 3 3 3 3 4 4 4 5 5 0 0
0 0 1 4 3 4 3 4 4 4 5 5 0
0 0 0 3 3 3 3 4 4 4 5 5 5
How can I do this as a script?
Please help
Thank you
##### 1 CommentShow NoneHide None
Catalytic on 25 Apr 2021
It appears that you have not Accept-clicked any of the answers you have been given to your other questions.
Were they all unhelpful?

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### Accepted Answer

Matt J on 25 Apr 2021
Edited: Matt J on 25 Apr 2021
B=[1 2 3 4 5 6 7 8 5 5
3 3 3 3 3 4 4 4 5 5
1 4 3 4 3 4 4 4 5 5
3 3 3 3 4 4 4 5 5 5];
[m,n]=size(B);
result=spdiags(B,0:n-1,m,n+m-1);
full(result)
ans = 4×13
1 2 3 4 5 6 7 8 5 5 0 0 0 0 3 3 3 3 3 4 4 4 5 5 0 0 0 0 1 4 3 4 3 4 4 4 5 5 0 0 0 0 3 3 3 3 4 4 4 5 5 5
##### 3 CommentsShow 2 older commentsHide 2 older comments
Amanda on 25 Apr 2021
Done

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