replace not selected value by zero

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]?.

Answer 1

[Star Strider]

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

[Image Analyst]

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]

‘I have 10 values. my code select 3 values,’

I interpret ‘values’ as indicating array elements.

Answer 2

[Image Analyst]

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.