Not a machine-size real number?

*To*: mathgroup at smc.vnet.net*Subject*: [mg9260] Not a machine-size real number?*From*: sorrodp at ece.WPI.EDU (Pedro Soria-Rodriguez)*Date*: Fri, 24 Oct 1997 01:01:15 -0400*Organization*: Worcester Polytechnic Institute*Sender*: owner-wri-mathgroup at wolfram.com

Hello, I am trying to do the following in Mahtematica 3.0.0 for Linux BB[I_,a_,NN,d_,z_]= (I*NN/(2*d))*(z/Sqrt[a^2+z^2]) Plot[BB[1,0.05,100,0.01,z],{z,-1,1}] Instead of getting the plot, I get the following error message: Plot::"plnr": BB[1,0.05,100,0.01,z] ] is not a machine-size real number at z = -1 .. Plot::"plnr": BB[1,0.05,100,0.01,z] ] is not a machine-size real number at z = -0.918866 Plot::"plnr": BB[1,0.05,100,0.01,z] ] is not a machine-size real number at z = -0.830382 .. General::"stop": Further output of Plot::"plnr" will be suppressed during this calculation. --------------------------------------------------- What does this mean? Is the definition of my function incorrect? Thank you very much in advance -- -- Pedro Soria-Rodriguez sorrodp at ece.wpi.edu