Fit[] problem

*To*: mathgroup at christensen.cybernetics.net*Subject*: [mg1806] Fit[] problem*From*: glagorio at vol.it (Giovanni Lagorio)*Date*: Mon, 31 Jul 1995 23:08:25 -0400

I have a problem with Fit[] (I'm using Mathematica for Student 2.2.1 Windows). Here is the session: in : ( data = Table[ Sum[i,{i,1,n}] , {n,0,100} ] ) //Short out: {0, 1, 3, 6, 10, 15, 21, 28, 36, <<88>>, 4753, 4851, 4950, 5050} in : Chop[ Fit[ data , {1,x,x^2} , x ] ] 2 out: -0.5 x + 0.5 x ^^^^^^^^^^^^^^^ and this is ok ... but ... in : Chop[ Fit[ data , {1,x,x^2,E^x} , x ] ] out: 0 ^^^ Why ?!?!? I don't understand why the result change adding an useless function... someone knows ? Thanks in advance, Giovanni -- Giovanni Lagorio | Real programmers don't comment their code. glagorio at mbox.vol.it | It was hard to write, it should be hard to understand.