Plots come out blank except for certain limits
- To: mathgroup at smc.vnet.net
- Subject: [mg123616] Plots come out blank except for certain limits
- From: John Colvin <john.loughran.colvin at gmail.com>
- Date: Tue, 13 Dec 2011 05:41:37 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
Hi, I'm an absolute beginner with Mathematica so I may well have missed something very simple. I'm trying to visualise a simple minimisation problem in 2 parameters This is the code i run: f[a, b] = Integrate[(Sin[5*x] + Sin[3*x] - Sin[a*x] - Sin[b*x])^2, {x, 0, 10}] this takes quite a while and returns a VERY long result then I attempt to plot: Plot3D[f[a, b], {a, 0, 10}, {b, 0, 10}] the resulting plot is a 3D sinusoidal of sorts, from f = -1..1. Unless I'm very much mistaken, the integral of the square of a real-valued function should always be positive, so something seems amiss here already. Also, if I change the a and b ranges: Plot3D[f[a, b], {a, 0, 12}, {b, 0, 12}] for example, I get a blank plot I realise I may just be missing something simple, but any help would be much appreciated. Thanks, John
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