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[project @ 1993-08-30 15:40:16 by jwe]
author jwe
date Mon, 30 Aug 1993 15:40:48 +0000
parents b4df021f796c
children 16a24e76d6e0
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function y = trace (x)

# usage: trace (x)
#
# Returns the trace (the sum of the diagonal elements) of x.

  if (nargin != 1)
    error ("usage: trace (x)");
  endif

  y = sum (diag (x));

endfunction