if condition for Matrix

1 view (last 30 days)
Osamah Alayafi
Osamah Alayafi on 31 May 2021
Answered: Steven Lord on 31 May 2021
I have Matrix for example
M = ones(10,10)
how I make ( if condition) s.t
M(i-tau,j)=0 if i-tau <0,
where i =1:10 and j =1:10
  1 Comment
Torsten on 31 May 2021
M(i-tau,j) does not exist if (i-tau)<0. So you can't set it to a specified value ( 0 in this case ).

Sign in to comment.

Accepted Answer

Steven Lord
Steven Lord on 31 May 2021
M(i-tau,j)=0 if i-tau <0,
There's no such thing as row -1 of a matrix in MATLAB. Depending on what you're trying to do you could limit the values of i over which you iterate to those that make i-tau a positive integer value or you could detect the condition where i-tau is negative (actually you'd want to detect when it's non-positive since there's no such thing as row 0 in a matrix in MATLAB either. The first row in a matrix in MATLAB is row 1.) and skip attempting to index into M entirely.

More Answers (0)


Find more on Resizing and Reshaping Matrices in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by