MATLAB: Array manipulation such as [ 1 2 5 7 3 …. ] –> [ 1 1 1 … 2 2 2 … 5 5 5 … 7 7 7 … 3 3 3 … …. ].

array manipulation

Using

A = [ 1 2 5 7 3 .... ],

I would like to create

B = [ 1 1 1 ... 2 2 2 ... 5 5 5 ... 7 7 7 ... 3 3 3 ... .... ]

Can you please show me a way to do that? Thanks.

Best Answer

repelem(A, 3)

Related Solutions

MATLAB: Theory/ mathematics behind pspectrum

If you go to the help and online documentation you will find two references:

[1] harris, fredric j. “On the Use of Windows for Harmonic Analysis with the Discrete Fourier Transform.” Proceedings of the IEEE®. Vol. 66, January 1978, pp. 51–83.

[2] Welch, Peter D. “The Use of Fast Fourier Transform for the Estimation of Power Spectra: A Method Based on Time Averaging Over Short, Modified Periodograms.” IEEE Transactions on Audio and Electroacoustics. Vol. 15, June 1967, pp. 70–73.

That is what matlab uses for references - maybe someone from the matlab staff will suggest additional references...

MATLAB: Sum columns of matrix

>> M = [1,5,2,4,3,2;2,3,1,4,4,1;4,5,2,2,3,1]
M =
   1   5   2   4   3   2
   2   3   1   4   4   1
   4   5   2   2   3   1
>> M(:,1:2:end) + M(:,2:2:end)
ans =
   6   6   5
   5   5   5
   9   4   4
>> reshape(sum(reshape(M.',2,[]),1),[],3).'
ans =
   6   6   5
   5   5   5
   9   4   4

And

>> M = [2,1,2,1,1,5,5,4,4,2,4,5;3,5,1,3,1,2,5,3,3,4,5,4;2,4,2,1,5,5,4,3,2,2,1,5]
M =
   2   1   2   1   1   5   5   4   4   2   4   5
   3   5   1   3   1   2   5   3   3   4   5   4
   2   4   2   1   5   5   4   3   2   2   1   5
>> reshape(sum(reshape(M.',3,[]),1),[],3).'
ans =
    5    7   13   11
    9    6   11   13
    8   11    9    8

Best Answer

Related Solutions

MATLAB: Theory/ mathematics behind pspectrum

MATLAB: Sum columns of matrix

Related Question