LogLinearPlot Nintegrate and a strange error message
- To: mathgroup at smc.vnet.net
- Subject: [mg123769] LogLinearPlot Nintegrate and a strange error message
- From: Artur Henrykowski <mantysa at gmail.com>
- Date: Sun, 18 Dec 2011 04:36:03 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
Hello, I noticed a strange behavior of Mathematica (version 7). I have no much experience in using it so probably there is something what I do not know (nor understand). I want to plot some function which is defined as integral, e.g. f := NIntegrate[(Sinc[1/x*u]), {u, 0, 1}] then I plotted it Plot[f, {x, 1, 2}] and it seems to be ok. But when I changed the function to LogLinearPlot datax = Reap[LogLinearPlot[f, {x, 1, 2}, EvaluationMonitor :> Sow[x]]] I obtained error message: "NIntegrate::ncvb:"NIntegrate failed to converge to prescribed accuracy after..." or other similar (e.g. Converge to slowly...) depending on function. But when I explicitly calculate values of function at points x of LogLinearPlot f /. {x -> datax} there is no error message. Why do I obtain this this message after calling LogLinearPlot but not in other cases? Are these values and plots reliable? Artur
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