MATLAB: Dear users Can anyone guide me on how to insert zero after every fourth element in an array. I have a matrix of (15×1)…final matrix should be of dimension (20×1) with 4th,8th,16th,and 20th element as zero. Thank you.

matrix manipulation

Dear users
Can anyone guide me on how to insert zero after every fourth element in an array. I have a matrix of (15×1)…final matrix should be of dimension (20×1) with 4th,8th,16th,and 20th element as zero. Thank you.

Best Answer

>> X = 1:15
X =
    1    2    3    4    5    6    7    8    9   10   11   12   13   14   15
>> reshape([reshape(X,3,5);zeros(1,5)],1,[])
ans =
    1    2    3    0    4    5    6    0    7    8    9    0   10   11   12    0   13   14   15    0
Note that this only works because 15 is a multiple of 3 (1 less than the step you requested, 4). If this is not always the case then a more complicated version is required.
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