# Integrate error: "The integrand has evaluated to non-numerical values..."

**URL:** <https://community.wolfram.com/t/integrate-error-the-integrand-has-evaluated-to-non-numerical-values/17487>\
**Category:** Questions\
**Tags:** calculus, numerical-computation\
**Created:** [January 25, 2021, 10:41pm UTC](https://community.wolfram.com/t/integrate-error-the-integrand-has-evaluated-to-non-numerical-values/17487 "2021-01-25T22:41:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![alongcamp](https://avatars.discourse-cdn.com/v4/letter/a/7993a0/32.png) [@alongcamp](https://community.wolfram.com/u/alongcamp)\
**Post date:** [January 25, 2021, 10:41pm UTC](https://community.wolfram.com/t/integrate-error-the-integrand-has-evaluated-to-non-numerical-values/17487/1 "2021-01-25T22:41:08Z")

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Hello everyone,

I am trying to perform the numerical integration seen in the attached notebook but I am receiving an error that says "the integrand has evaluated to non-numerical values for all sampling points in the region with boundaries {{Infinity, 1}}. Does anyone know why this is happening and how I can fix it? Any help would be greatly appreciated!

Alex

[Test.nb](https://community.wolfram.com/uploads/short-url/9fJUIBgJd0A6gkgoiGuSHmLy00y.nb) (7.95 KB)

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**Author:** ![dontdont9](https://avatars.discourse-cdn.com/v4/letter/d/54ee81/32.png) [@dontdont9](https://community.wolfram.com/u/dontdont9)\
**Post date:** [January 26, 2021, 3:48am UTC](https://community.wolfram.com/t/integrate-error-the-integrand-has-evaluated-to-non-numerical-values/17487/2 "2021-01-26T03:48:47Z")

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In the places in your code where you have au is that perhaps a slightly different color from the other variables that have previously been assigned numeric values? Did you perhaps mean that to be (a\*u) instead?