How can I expand a array with with even zero intervals in between?

Question

Seba.V 2019-8-15

编辑： Bruno Luong 2019-8-15

Suppose I have an array a=[1 2 3], how can i generate a code that would add x-amout of zeros in between each value of the original array?

For example

a=[1 2 3] ----> function or loop (code) -----> a1=[1 0 0 2 0 0 3]

Answer 1

Bruno Luong 2019-8-15

编辑：Bruno Luong 2019-8-15

nz = 2;
b = a;
b(end+nz,:) = 0;
b = b(1:end-nz)

Seba.V 2019-8-15

Thank you !

Could you please tell me how the last two line of code work though please?

Sorry i am just starting out!

Bruno Luong 2019-8-15

编辑：Bruno Luong 2019-8-15

To understand you must aware that MATLAB store array column-wise, meaning

A = [1 3 5;

2 4 6];

is stored in contiguous internally 1, 2, 3, 4, 5 6, and when you RESHAPE A by

A(1:4), you'll get a row vector [1 2 3 4].

Now with that in mind, this first statement add nnz rows of zeros in B, so after reshaping you'll get NNZ zeros in between elements of the first row.

The last statement also removes the last NNZ zeros after the last element of a.