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Recommendation:
Names of matrix files should be strings starting by characters
A-Z ! _ & 
Names starting by other characters are treated as scalars.
Temporary matrix files created by sucros should have names
starting systematically by one of the characters ! _ &.
Then, for example, matrices starting by ! can be easily deleted
at the end of the sucro by the command
MAT KILL !*.MAT

Many (statistical) Survo operations give results as matrix files
with the extension .M (like CORR.M and MSN.M in CORR).
A list of such matrices is found by MATRES?