Re: How to increase Working Precision?


"Paul J Salmon" <pauljsalmom@xxxxxxxxx> wrote in message
news:8b028ca7-4e58-4167-95ea-ad06d5428c4f@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi all,

I hope this is the best medium (I tried another newgroup, but the
message has not appeared).


I wish to perform a number of calculations but need about 25 digits of
precision

I can use WorkingPrecision

http://reference.wolfram.com/mathematica/ref/WorkingPrecision.html

to increase the precision of some numerical operations, but how can I
perform all calculations to 25 digits and display all 25? So for
example if I enter

[In 1] Pi + 2.0

it returns

5.141592653589793238462643

rather than 5.14159

(I do not understand your input above, the [Ln 1]? )

Any way, I am no expert on this subject of Mathematica, but I think you can
tell Mathematica what your desired precision on an overall computation by
wrapping the whole expression with the function SetPrecision[] (see help on
this function).

http://reference.wolfram.com/mathematica/ref/SetPrecision.html

(from the above it says

"yields a version of expr in which all numbers have been set to have
precision p."

so may be this is what you want)


Nasser


.

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