How do i reshape the matrix from 2D- 3D?

I have a matrix 6x1000 double in matlab.How can i convert it to 3D as 6x1000x1 format ?

My input is times series data and i need to give it to sequence input layer for performing convolution.

I have tried

B=reshape(X,6,1000,1);

It didnt give errors, but B appeared same as 6 x 1000 double.

Input size of sequence input layer is given as 6 x 1000 x1.

and without reshaping/converting i am getting the below error while executing.

Invalid training data. Sequence responses must have the same sequence length as the

corresponding predictors.

[Rik]

What are the sizes of the sequence and predictors?

Matlab will hide trailing singleton dimensions. A 6x1000x1 array is stored the exact same way in memory as a 6x1000 array, because they are the same thing. So your error must come from a slightly different part.

[James Tursa]

All 1 dimensions beyond the 2nd dimension are not explicitly stored in MATLAB variables. That is, a 2x3x1 and a 2x3x1x1x1 variable will both be stored simply as a 2x3 variable. MATLAB will clip those trailing 1's automatically. Calling reshape( ) or similar functions will not change this result ... the trailing 1's will still be clipped.

[NN]

I have applied this reshape command and tried.Still i am getting the same error.

[NN]

@Rik Size of matrix is 6 x 1000

[Stephen23]

"I have a matrix 6x1000 double in matlab.How can i convert it to 3D as 6x1000x1 format ?"

They are already exactly the same arrays:

"Arrays in MATLAB are N-dimensional, with an infinite number of trailing singleton dimensions."

source: https://blogs.mathworks.com/loren/2006/08/09/essence-of-indexing/

The infinite trailing singleton dimensions might not be displayed, but implicitly they are always there. See also:

https://www.mathworks.com/matlabcentral/answers/294316-indexing-l-m-n-matrix-for-n-1-2-3#comment_378096

https://www.mathworks.com/matlabcentral/answers/229956-how-can-i-reshape-a-20370x1-matrix-into-2037x10x1#answer_186120

https://www.mathworks.com/matlabcentral/answers/406499-meaning-of-the-notation-of-accessing-the-elements-of-the-2d-matrix-using-4-subscripts

[Rik]

The error message spoke of two things: response and predictor. You only mention one size.