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diff scripts/linear-algebra/trace.m @ 4:b4df021f796c

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[project @ 1993-08-08 01:26:08 by jwe] Initial revision
author jwe
date Sun, 08 Aug 1993 01:26:08 +0000
parents
children 16a24e76d6e0
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--- /dev/null
+++ b/scripts/linear-algebra/trace.m
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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