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  • Committer: Bazaar Package Importer
  • Author(s): Torsten Werner
  • Date: 2002-03-21 16:57:43 UTC
  • Revision ID: james.westby@ubuntu.com-20020321165743-e9mv12c1tb1plztg
Tags: upstream-2.6
Import upstream version 2.6

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macros/elem/cosm.sci
 
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function x=cosm(a)
 
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//   cosm - computes the matrix cosine 
 
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//%CALLING SEQUENCE
 
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//   x=cosm(a)
 
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//%PARAMETERS
 
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//   a   : square hermitian or diagonalizable matrix
 
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//   x   : square hermitian matrix
 
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//!
 
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// Copyright INRIA
 
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if type(a)<>1 then error(53),end
 
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if a==[] then x=[],return,end
 
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if norm(imag(a),1)==0 then
 
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  x=real(expm(%i*a))
 
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else
 
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  x=0.5*(expm(%i*a)+expm(-%i*a));
 
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end