?? int0infy.m
字號:
function int=int0infy(fun,n,alpha)
%INT0INFY Integrate function from 0 to infty by laguerre quadrature.
% INT0INFY('FUN',N,ALPHA) integrates FUN(x) by approximating
% FUN(x) x^(-ALPHA) EXP(x) with an Nth order polynomial.
% ALPHA is assumed zero if omitted and N defaults to 32 if omitted.
% GKS 24 Dec 92
if nargin<2, n=32; end;
if nargin<3, alpha=0; end;
[t w] = laguerre(n,alpha);
int = w'* ( feval(fun,t) .* t.^(-alpha) .* exp(t) );
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