Hello group, I have encountered a somewhat strange problem in plotting a simple function. It seems to be related to the issues described in the tutorial section "Some Common Issues with Functions", but the lambda- function trick does not work here.
I have uploaded a worksheet with what I have been trying so far here: http://www.sagenb.org/home/steja/1/ Basically, I am trying to plot this expression: #sage> fermi(x,y,d,L) = 1 - 1/( exp( ( max(abs(x),abs(y))-L) /d) + 1) as a function of (x,y) for some different values of d and L (nothing too useful, I invented it as a toy project to get familiar with Sage). I tried the following commands, but none of them works: #sage> plot3d(lambda x,y: fermi(x,y,0.2,1),(x,-2,2),(y,-2,2)) #sage> def plfermi(x,y): return fermi(x,y,0.2,1) #sage> plot3d(plfermi,(-2,2),(-2,2)) Both of these commands do plot something, but the result is wrong. I also tried this: #sage> pf(x,y) = fermi(x,y,0.2,1.0) #sage> plot(pf,(-2,2),(-2,2)) Here, the result is an error message (which looks like Klingon language to me). Could somebody send some light down my way? I am almost dying to get rid of Mathematica in favor of an open source CAS (because of their #*! ยง license that always seems to fail when one desperately needs it), but I'm afraid I've still got a long way to go with Sage when I'm not even able to plot a simple function... -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
