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Increase nonzero values without deleting zeros

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monmatlab
monmatlab 2017-4-12
评论： David J. Mack 2017-4-12
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 个评论
KSSV
KSSV 2017-4-12
Where you want to place the non zeros numbers?
monmatlab
monmatlab 2017-4-12
编辑：monmatlab 2017-4-12
at their initial positions. I want to have the same vector , just with the nonzeros increased by ten

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采纳的回答

David J. Mack
David J. Mack 2017-4-12
编辑：David J. Mack 2017-4-12
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 个评论
Adam
Adam 2017-4-12
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
David J. Mack 2017-4-12
Ah true, the OP stated to increase it... but it's the same idea anyway. Just replace the * by a +.

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更多回答（1 个）

Adam
Adam 2017-4-12
X = ( X ~= 0 ) .* ( X + 10 );

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