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question about NIntegrate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg124957] question about NIntegrate
  • From: Leslaw Bieniasz <nbbienia at cyf-kr.edu.pl>
  • Date: Tue, 14 Feb 2012 06:38:39 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com


Hi,

I want to use function NIntegrate to integrate a function of x
that depends on two parameters y and z. However, when I write
something of the kind:

y=10;
z=1;
NIntegrate[Exp[-(x-y)/z],{x,0,Infinity}]

I get an error: Integrand is not numerical at {x} = {1.}

Strangely, if my function has only one parameter, the following
code works fine:

y=10;
NIntegrate[Exp[-(x-y)],{x,0,Infinity}]

giving the result 22026.5

What am I doing wrong?

Leslaw





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