The expected output size does not match your explanation. If you add 59 values between any two existing adjacent values (exactly as your state), then you will actually get an output matrix with
23*60+1 % rows
not
24*60 % rows (incorrect)
This is probably because you have not considered the ends (e.g. requiring extrapolation before/after the existing values).
"I need minute wise data so one point has to become 60 points."
Have you considered what happens at the edges of your data?
Here is a simple demonstration of your explanation and the corresponding output matrix size. Here is a 1x4 vector:
X = [0, 3, 6, 9];
Now lets add two points between adjacent existing values, exactly as you specify:
Y = [0,1,2,3,4,5,6,7,8,9];
The output vector actually has
N = numel(X); % number of existing points
P = 2; % number of points added
(N-1)*(P+1)+1 % number of output points
Lets check this value against your estimation:
numel(Y)
N*(P+1) % your approach
