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How to evaluate a NIntegrate expression properly

• To: mathgroup at smc.vnet.net
• Subject: [mg39698] How to evaluate a NIntegrate expression properly
• From: Yong Xiao <hardes at MIT.EDU>
• Date: Mon, 3 Mar 2003 04:24:41 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Hi,
I have a problem regarding to how to use NIntegrate and NSolve together.
A sampe is as follwing:

f[y_] := NIntegrate[y^2*x^2, {x, 0, 3}]
NSolve[f[y] == 20, y]

Complaint:
\!\(NIntegrate::"inum" \(\(:\)\(\ \)\) "Integrand \!\(2.25`  \\\\  y\^2\)
is
    not numerical at \!\({x}\) = {1.5`}."\)

Thanks in advance.

X.Y.

• Follow-Ups:
  • Re: How to evaluate a NIntegrate expression properly
    • From: Daniel Lichtblau <danl@wolfram.com>