Filter löschen
Filter löschen

Indexing and replacing value in a zero matrix based on a table

1 Ansicht (letzte 30 Tage)
I am trying to input a value in a zeros matrix of size 11*10. This is based on a variable which has three columns (Number, ID, ANS) as shown below. Now I want to insert the value in ANS which is -1 in the zeros matrix at 10x5 (ID x Number) position (index). Any suggestion on how this can be done?
Number ID ANS
5 10 -1

Akzeptierte Antwort

Walter Roberson
Walter Roberson am 19 Dez. 2018
If your Number and ID and ANS are scalar then
YourMatrix(Number, ID) = ANS;
If they are vectors then there are multiple approaches, including:
YourMatrix( sub2ind(size(YourMatrix), Number(:), ID(:)) ) = ANS(:);
YourMatrix = YourMatrix + accumarray( Number(:), ID(:), ANS(:), size(YourMatrix) );
and there are approaches using sparse.

Weitere Antworten (1)

Arvind Sathyanarayanan
Arvind Sathyanarayanan am 19 Dez. 2018
Is this what you're looking for?
ID = 10; Number = 5; Ans = -1;
tmat = zeros(11,10);


Mehr zu Word games 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