combine 3x3D into 4D matrix

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Sean Phillips 2019-5-17

评论： Sean Phillips 2019-5-17

I have 3 x 3D Matrixs of size (nrows x nfreqs x time) ie (5000 x 10 x 100)

i want to combine them into a 4D matrix of size (5000 x 3 x 10 x 1000)

ie the 5000 rows of 3D matrix are combined as 3 columns in the 4D matrix

Walter Roberson 2019-5-17

Easiest:

permute(cat(4,M1, M2, M3), [1 4 2 3])

less memory perhaps:

cat(2,reshape(M1, 5000, 1, 10, 100), reshape(M2, 5000, 1, 10, 100), reshape(M3, 5000, 1, 10, 100))

Sean Phillips 2019-5-17

thank you. it works.

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