LogLogPlot encounters Infinite expression

*To*: mathgroup at smc.vnet.net*Subject*: [mg126156] LogLogPlot encounters Infinite expression*From*: John_V <jvillar.john at gmail.com>*Date*: Sat, 21 Apr 2012 00:32:03 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

If I try this: f[x_] = Piecewise[{{0, x < 10}}, Exp[x/20]] LogLogPlot[1/f[x], {x, 11, 20}] the result is an error message (Infinite expression 1/0 encountered) and a plot that has axes but no graph. Notice that although 1/f is indeed 1/0 for x<10, the requested plot range does not include x<10. The function is well-defined within the requested plot range. Does anyone know what's going on with this? John