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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/inttrap.sci
 
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function v = inttrap(x,y)
 
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//inttrap  Trapezoidal numerical integration.
 
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//v = inttrap(x,y) computes the integral of y with respect to x using
 
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//trapezoidal integration.  x and y must be vectors of the same dimension
 
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//v = inttrap(y) computes the trapezoidal integral of y assuming unit
 
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//spacing between the data points. 
 
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// Copyright INRIA
 
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[lhs,rhs]=argn(0)
 
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if rhs<2 then
 
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  y=x;
 
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  v=sum(y(1:$-1) + y(2:$))/2;
 
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else
 
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  if size(x,'*')<>size(y,'*') then
 
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    error('input vectors must have the same dimension');
 
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  end
 
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  x=x(:);y=y(:);
 
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  v=(x(2:$)-x(1:$-1))'*(y(1:$-1) + y(2:$))/2;
 
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end
 
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