How do I insert data into new format based on row positions?

Hi All - i'm having difficulty getting my data in the right format and wondered if you could help?

% Here is my data

data = [8; 7; 1; 5]

% I have the row positions of where the data sits in the desired format

datarowpositions = [0; 0; 0; 4; 0; 1; 0; 2; 0; 0; 3; 0]

% This is how I would like the data to be moved into

desired = [0; 0; 0; 5; 0; 8; 0; 7; 0; 0; 1; 0]

Thank you so much for your time.

[Stephen Cobeldick]

http://web.archive.org/web/20210107134405/https://www.mathworks.com/matlabcentral/answers/711038-how-do-i-insert-data-into-new-format-based-on-row-positions

Answer 1

[Stephen Cobeldick]

data = [8; 7; 1; 5];
datarowpositions = [0; 0; 0; 4; 0; 1; 0; 2; 0; 0; 3; 0];
desired = datarowpositions;
desired(datarowpositions~=0) = data(nonzeros(datarowpositions))

desired = 12×1

0 0 0 5 0 8 0 7 0 0

●

... more rows here

[AV]

Thank you very much!