Creating a matrix within a matrix

1 Ansicht (letzte 30 Tage)
Jakub
Jakub am 21 Feb. 2013
I'm having trouble on how to create an MxN matrix will all zeros and in that MxN matrix I want the the first column, first row, last row, and last column to be zeros while the rest of the matrix is all different numbers, with possible values as 0 zeros as well. An example is below,
0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 1 1 0 1 0 1 1 1 1 1 0 0 0
0 0 1 1 0 1 0 0 0 1 1 1 1 0
0 1 0 1 1 1 1 0 1 0 1 0 1 0
0 1 0 0 1 1 1 1 1 1 1 1 1 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0
Really the only values that the middle section can have is one or zero but the outsides have to all be zeros.
  3 Kommentare
Jakub
Jakub am 21 Feb. 2013
Well the first step I tried was doing zeros(M,1,1) and then (zeros(1,N,1) and got stuck with that because that only provided me with the first row and column. Next I tried doing a zeros(M,N) but that leaves me with a MxN zero matrix.
Jakub
Jakub am 21 Feb. 2013
It's actually part of my Thesis however I have no prior computer programing background and my adviser took the week off ~_~

Melden Sie sich an, um zu kommentieren.

Akzeptierte Antwort

Matt J
Matt J am 21 Feb. 2013
Bearbeitet: Matt J am 21 Feb. 2013
If you're saying you have a given matrix A and want to set the edges to zero,
A([1,end],[1,end])=0;
  2 Kommentare
Jakub
Jakub am 21 Feb. 2013
Alright I understand that, thank you. One last question would be how do I randomly pick values either 0 or 1 inside the submatrix I want. Meaning I leave the outside all zeros but generate possible 1 or 0 on the inside.
Matt J
Matt J am 21 Feb. 2013
Use randi() to generate random zeros and ones everywhere. Then use the code I showed you to set the boundaries to zero.

Melden Sie sich an, um zu kommentieren.

Weitere Antworten (0)

Kategorien

Mehr zu Creating and Concatenating Matrices finden Sie in Help Center und File Exchange

Community Treasure Hunt

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

Start Hunting!

Translated by