How to use NIntegrate to integrate a purely numeric vector function?
- To: mathgroup at smc.vnet.net
- Subject: [mg118690] How to use NIntegrate to integrate a purely numeric vector function?
- From: andre hollstein <andre.hollstein at googlemail.com>
- Date: Sat, 7 May 2011 07:33:31 -0400 (EDT)
Hi Mathgroup, I hope you can help me.
I want to use NIntegrate to integrate a purely numeric vector
function. I simplified this problem to an easy example code. In my
application the function f involves some matrix products with an
InterpolatedFunction object (which is a vector)...
So this is my problem:
Clear[f]
f[a_?NumberQ] := {a, a*a} (*f is returning a list*)
NIntegrate[f[a], {a, 2, 3}]
During evaluation of (Local) In[2569]:= NIntegrate::inum: Integrand
f[a] is not numerical at {a} = {2.00796}. >>
During evaluation of (Local) In[2569]:= NIntegrate::inum: Integrand
f[a] is not numerical at {a} = {2.00796}. >>
Out[2571]= NIntegrate[f[a], {a, 2, 3}]
When f returns a scalar it it working just fine:
Clear[f]
f[a_?NumberQ] := a (*f is returning a scalar*)
NIntegrate[f[a], {a, 2, 3}]
Out[2577]= 2.5
There is hopefully a way to solve this issue...
Thanks, Andr=E9