Mathematica LogPlot Bug
- To: mathgroup at smc.vnet.net
- Subject: [mg123707] Mathematica LogPlot Bug
- From: AntonioP <ant.piniz at gmail.com>
- Date: Fri, 16 Dec 2011 05:47:08 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
Hello, I have to draw some functions in log scale, but LogPlot seems not to be able to draw them correctly if the y-value is too small. A simple case: f[x_] = 10^(-5 x) LogPlot[f[x], {x, 1, 100}, PlotRange -> Full] the plot should be a simple straight line for any x value, while at about x=61.5 there is a step and, for any greater value of x, the function appears to be constant. Nevertheless, Mathematica is able to compute the correct value of f[x] for any x: N[f[60]] N[f[65]] N[f[80]] N[f[100]] There is a similar problem for large y-values, as well. Apparently there is a y-range, about (10^-308, 10^308), outside which LogPlot doesn't work correctly. Any idea on how to resolve the problem? Thanks, Antonio