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58 lines
1.7 KiB
Plaintext
58 lines
1.7 KiB
Plaintext
NAME
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mattrace - trace of a square matrix
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SYNOPSIS
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mattrace(m)
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TYPES
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m square matrix with summable diagonal elements
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return determined by addition of elements
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DESCRIPTION
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For a two-dimensional square matrix, mattrace(m) returns the sum of
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the elements on the principal diagonal. In particular, if m
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has been created by mat m[N,N] where N > 0, mattrace(m) returns
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m[0,0] + m{1,1] + ... + m[N-1,N-1]
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EXAMPLE
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; mat m[2,2] = {1,2,3,4}
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; print mattrace(m), mattrace(m^2)
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5 29
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LIMITS
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none
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LINK LIBRARY
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none
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SEE ALSO
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mat, mattrans
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## Copyright (C) 1999 Landon Curt Noll
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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## as published by the Free Software Foundation.
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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## distributed with calc under the filename COPYING-LGPL. You should have
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## received a copy with calc; if not, write to Free Software Foundation, Inc.
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## @(#) $Revision: 30.1 $
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## @(#) $Id: mattrace,v 30.1 2007/03/16 11:10:42 chongo Exp $
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## @(#) $Source: /usr/local/src/bin/calc/help/RCS/mattrace,v $
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##
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## Under source code control: 1997/09/06 20:03:35
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## File existed as early as: 1997
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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