Increase nonzero values without deleting zeros
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monmatlab
el 12 de Abr. de 2017
Comentada: David J. Mack
el 12 de Abr. de 2017
I have a vector X.
X=[0 0 0 0 1 1 1 1 0 0 0 0 0 0 2 2 2 2 2 2 0 0 0 3 3 3 3 0 0 0 0 0 4 4 4]
I want to increase the values of the nonzero elements in vector X by 10 However, when I do this using the find function I end up just having a vector without the zeros.
Y=X((find(X~=0)))+10;
Y=[11 11 11 11 22 22 ... ]
Is there a way to do this without using a for loop?
2 comentarios
Respuesta aceptada
David J. Mack
el 12 de Abr. de 2017
Editada: David J. Mack
el 12 de Abr. de 2017
Hey monmatlab, simply use logical indexing:
Y = X;
isNonzero = X~=0;
Y(isNonzero) = 10*Y(isNonzero);
or the more compact inplace replacement:
X(X~=0) = 10*X(X~=0);
Greetings, David
2 comentarios
Adam
el 12 de Abr. de 2017
If this is what you actually want to do, with multiplication then you can just skip the logical part and use
X = X * 10
since multiplying by 0 is 0 anyway! I was under the impression you wanted to add 10, not multiply by it though.
David J. Mack
el 12 de Abr. de 2017
Ah true, the OP stated to increase it... but it's the same idea anyway. Just replace the * by a +.
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