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5.1.156 trace

Syntax:
trace ( intmat_expression )
trace ( matrix_expression )
Type:
int, if the argument is an intmat, resp.
poly, if the argument is a matrix
Purpose:
returns the trace of an intmat, resp. matrix.
Example:
 
  intmat m[2][2]=1,2,3,4;
  print(m);
==>      1     2
==>      3     4
  trace(m);
==> 5
See intmat; matrix.
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