Re: Additive inverses of lists?

*To*: mathgroup at smc.vnet.net*Subject*: [mg95791] Re: Additive inverses of lists?*From*: dh <dh at metrohm.com>*Date*: Tue, 27 Jan 2009 07:00:05 -0500 (EST)*References*: <glk1l9$lmj$1@smc.vnet.net>

Hi Erik, it looks like the arguments of StreamPlot are not properly evaluated: E.g.: StreamPlot[1 + {x, y}, {x, -3, 3}, {y, -3, 3}] StreamPlot[1 {x, y}, {x, -3, 3}, {y, -3, 3}] both crash the kernel. This is a bug, please report it to Wolfram. Daniel Erik Max Francis wrote: > Is this a known no-no, or did I find something new? (I obviously > originally tried it in the graphical front end; I'm only doing it from > the command line interface for demonstration.) > > max@boron:~% math > Mathematica 7.0 for Linux x86 (32-bit) > Copyright 1988-2008 Wolfram Research, Inc. > > In[1]:= StreamPlot[-{x, y}, {x, -3, 3}, {y, -3, 3}] > zsh: segmentation fault math > > Interestingly enough if the StreamPlot is not involved, nothing but happens: > > In[1]:= -{a, b} > > Out[1]= {-a, -b} > > And plotting {-x, -y} instead of -{x, y} works fine: > > In[1]:= StreamPlot[{-x, -y}, {x, -3, 3}, {y, -3, 3}] > > Out[1]= -Graphics- >