How do I add an integer to every or any nth row
41 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
hbcukid
am 19 Nov. 2020
Kommentiert: hbcukid
am 19 Nov. 2020
Fairly new to MATLAB so I am just playing around to familiarize myself with it.
Lets say I have a 4x4 matrix, "A", how would I add for exaple 2 to every element in every other row (in this instance odd rows)? How would this differ if I wanted it for every nth row?
A = [1 1 0 0; 1 1 0 0; 0 0 0 0; 0 0 0 0]
desired output:
A = [3 3 2 2; 1 1 0 0; 2 2 2 2; 0 0 0 0]
0 Kommentare
Akzeptierte Antwort
James Tursa
am 19 Nov. 2020
Bearbeitet: James Tursa
am 19 Nov. 2020
A(k,:) is the k'th row of A
A(:,k) is the k'th column of A
A([k m p],:) is the sub-matrix formed from the k'th, m'th, and p'th rows of A
A(:,[k m p]) is the sub-matrix formed from the k'th, m'th, and p'th columns of A
A(1:5:end,:) is the sub-matrix formed from every 5'th row of A
A(:,1:5:end) is the sub-matrix formed from every 5'th column of A
etc.
To add a number to such sub-matrices, simply put them in an assignment
A(whatever) = A(whatever) + number;
The "whatever" is the indexing you want to pick off rows or columns etc.
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Characters and Strings 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!