Populate a column vector with values from another column vector

2022 12 5
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Hey!
I have a column vector A that is 1x50 that contains values
I want to populate a 1x57 zero column vector B with the values of A at a certain index.
E.g. At index 0,1,2,5,7,8,11 should all be 0 - the other values of vector B should be populated from the non-zero values in vector A. How do i go about doing this?

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KSSV
KSSV 2022-12-5
How index can be 0? Index cannot be zero. Your question is not clear though.
Raahim Muzaffar
Raahim Muzaffar 2022-12-5
Sorry I'm getting used to matlab syntax. By index = 0 i mean first element in the array.
To be more specific, I have:
Column vector A that is 1x50.
Column vector B that is 1x57.
I want the values of the first element in B, second element in B, third element in B, 6th element in B, 8th element in B, 9th element in B, 12th element in B to all be zero. I want the rest of the 50 values to be the values specified in Column Vector A. Hope this is more clear

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Walter Roberson
Walter Roberson 2022-12-5
Ran in:

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Ran in:
A = randi(9, 1, 50);
zeros_at = [0,1,2,5,7,8,11];
B = zeros(1, numel(A) + length(zeros_at));
mask = ismember((0 : length(B)-1), zeros_at);
B(~mask) = A;
B
B = 1×57
0 0 0 6 9 0 6 0 0 7 5 0 5 3 6 7 7 7 7 6 7 8 7 6 9 2 7 4 1 9

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Walter Roberson
Walter Roberson 2022-12-5
Ran in:
Ran in:
Marginally different approach:
A = randi(9, 1, 50);
zeros_at = [0,1,2,5,7,8,11];
B = zeros(1, numel(A) + length(zeros_at));
idx = setdiff(1:length(B), zeros_at+1);
B(idx) = A
B = 1×57
0 0 0 4 8 0 2 0 0 5 9 0 9 3 7 5 7 9 8 3 3 5 8 2 5 7 1 2 1 8

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