Concatenation with hypermatrix

[Orbeman]

I've finally found the command C=cat(3,C,x). It works but very slowly. For
exemple it needs more than 2 min to create a 890 * 2 * 5 3D hypermatrix, but
barely 1 sec to create the same data with 890 * (2+2+2+2+2) 2D matrix.

In fact, I've analysed n experiences which data (2 rows and variable line)
are written in one file per experience. All of the files are not the same
length, so I add number 'tag' to egal the maximun number of line, here 890.

After that I've created some others (hyper) matrix with different size of
row : 890 * 1 * 5, 890 * 3 * 5,...

I can imagine the increase of time for comptute.

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