Change .txt to .mat in above; i.e, 

Matlab input:

A = rand(3,3,4,'mp');

mp.write(A, 'mpmatrix.mat');

B = mp.read('mpmatrix.mat');

Matlab output:

Error using mp (line 1331)
Error: uneven number of elements in the rows.
Error in mp.read (line 1017)
A = mp(['[',s,']']);

This .mat file format is read/writable to both Mathematica and Matlab.

Multiprecision Toolbox already understands .mat; e.g, mp.read() and mp.write().

But it coughs on import of multidimensional arrays.  Should it not, if not textual?

This makes communication inelegant, by file transfer with Mathematica.

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Hi Pavel

Previous versions need to be online to test for version-dependent anomalies and to rebuild a computer.

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Jon