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MAT NAME <matrix file> AS <new matrix name> 
renames the matrix currently saved in <matrix file>. The name of the
matrix file remains unaltered.
MAT NAME is useful, for example, when the name of the matrix has become
too long. There is no upper limit for the name length, but only 128
first characters will be saved.

Another way to change the name of the matrix is to write a MAT operation
in the form
MAT C!=A+B       / Please, note a (!) after C
Then the result A+B will be saved in file C and the name of it will
also be C. The same situation may be reached by the following two
operations:
MAT C=A+B                     / *C~A+B 10*3
MAT NAME C AS C               / *C~C 10*3
  C = More information on MAT control operations