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Re: calculation of exp(200)
Posted:
Jul 8, 2014 7:15 PM


"Nasser M. Abbasi" wrote in message <lpfj5e$4c4$1@speranza.aioe.org>... > On 7/7/2014 8:26 PM, kumar vishwajeet wrote: > > I want to find exp(N) where N can range from 0 to 200. > >Is there any method to calculate it with good accuracy? > > as James said, you can use vpa > > vpa(exp(sym(200)),500) > > > 7225973768125749258177477042189305697356874428527 > 31928403269789123221909361473891661561.9265890625 > 7055746840204310142941817711067711936822648098307 > 7273278800877934252667473057807294372135876617806 > 9702350324220401483115192088442120622525378469924 > 9272881421981093552839024711140014485905504285329 > 2850053281888896583514044902234770562940736477036 > 9022153799888245922895391403712478563813079673045 > 5316370477078232246232166391756343572294659379732 > 9550687822348546666476886365318979823972170480437 > 40943587594 > > But you have to do all the rest of the computation > is syms land, otherwise what is the point of > getting this accuracy if you can't use it in > numerical matlab. > > > Actually I have a matrix whose elements range from exp(200) to exp(200). The matrix is ill conditioned with conditioning number of 10^167. I am calculating determinant of this matrix. MATLAB gives it in the 10^13. The matrix is posted in the following link. http://math.stackexchange.com/questions/859597/determinantofanillconditionedmatrix/859614#859614 So, I was just wondering whether to rely on this calculation of determinant or not.



