replace not selected value by zero

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HASAN AL-KAF
HASAN AL-KAF 2018-1-28
评论： Star Strider 2018-1-28
Hi I have 10 values. my code select 3 values, for example, if x=[1 2 3 4 5 6 7 8 9 10] and my code select [1 3 5] i want a code to do this x= [1 0 3 0 5 0 0 0 0 0]?.

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采纳的回答

Star Strider
Star Strider 2018-1-28
This works:
x=[1 2 3 4 5 6 7 8 9 10];
ToKeep = [1 3 5];
idx = ismember(x, ToKeep);
Result = x .* idx
Result =
1 0 3 0 5 0 0 0 0 0
  2 个评论
Image Analyst
Image Analyst 2018-1-28
Totally different than what I did and that made me see the ambiguity. We need Hasan to clarify if the [1,3,5] are the indexes of x that should be kept (like I assumed), or the values of x that should be kept (like you assumed).
Star Strider
Star Strider 2018-1-28
‘I have 10 values. my code select 3 values,’
I interpret ‘values’ as indicating array elements.

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更多回答（1 个）

Image Analyst
Image Analyst 2018-1-28
Here's one way:
x=[1 2 3 4 5 6 7 8 9 10]
mask = [1 3 5]
x2 = zeros(1, length(x)); % Initialize x2
x2(mask) = x(mask) % Pull over values in the mask from x and put them in the same column.

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