Dealing with Indeterminant points & ListPlot

*To*: mathgroup at smc.vnet.net*Subject*: [mg2062] Dealing with Indeterminant points & ListPlot*From*: Ed Oswalt <efo at pixel.kodak.com>*Date*: Sat, 23 Sep 1995 20:34:11 -0400*Organization*: Eastman Kodak - any opinions expressed are my own...

I am using the latest Student version of Mathematica and was having a problem dealing with indeterminant points in in a function like Sin[x]/x where Sin is indeterminant at x = 0 (but by L'Hopitals is equal to 1. When I try to plot such functions Mathematica complains. What can I do to get around this? Can I use an If[] function inside other functions like Plot[] to test for x = 0 and sub in the value 1 for the formula in that instance? How do I do that - tried and can't get it to work right. I just started with Mathematica this weekend and was a little dissapointed since my HP-48GX calculator handles these functions fine (not sure if attempts L'Hopital's or just follows the convergance to 1). Also my prof claims matlab handles Indeterminant points. I plan to e-mail them the suggestion to handle these points better (even if it means a switch to activativate finding a symbolic L'Hopitals solution or just following where the convergance appears to be at. Also I am using ListPlot[] on the same student windows version and the dots are too small - they are invisable on the screen and barely visable on print out, I end up having to join the points so I can see them but that is not what I want to show - I want to show the points. Any Idea's on how to make these dots "Fatter"? Thanks for any help, Ed Oswalt Part time student & Full Time Engineer efo at dtc.kodak.com