|Bill Allombert on Tue, 15 Mar 2016 22:37:06 +0100|
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|Re: Increasing precision|
On Tue, Mar 15, 2016 at 05:22:49PM -0400, Charles Greathouse wrote: > Suppose I have a function which needs guard digits. How can I increase the > precision of an existing variable? > > \p 100 > x=Pi; > \p 19 > y=Pi; > x-y \\ -2E-19: precision is about 19 digits > x-precision(y,100) \\ -5E-20: precision is still about 19 digits You are confused by the display... Insert a \p100 afer y=Pi and you will see your example is correct. Cheers, Bill.