*To*: mathgroup@smc.vnet.net*Subject*: [mg12080] RE: [mg11980] Q: multiprecision question*From*: Ersek_Ted%PAX1A@mr.nawcad.navy.mil*Date*: Sat, 25 Apr 1998 01:30:16 -0400

Bin Wrote: ---------- |I am new to the mathematica so my problem might be naive. I am now doing |some research on the extrapolation from real axis to the complex plane, |by using the analytic continuity property in complex variable. However, |due to the finite precision of Fortran and other programs, the result is not |very accurate. I heard that mathemaica can perform the computation by |specify the precision. My question is: Is that possible in mathematica? |How to do that? i.e. If I want, say 100 decimal, how can I let |mathematica know that? | Easy. Suppose you want to compute Sin[3+I] with 100 correct digits. That's Sin[3 + Capital i ] where (Captital i)=Sqrt[-1]. Just do the following: In[9]:= N[ Sin[3+I], 100] Out[9]= 0.21775955162215223162459475156621247326955061443448722968716807454448535449 95\ 833705594829876739116357-1.\ 1634403637032505573309761202206068610104166170444687227097984173175641584306 87\948953192496817358504 I Ted Ersek