FAQ
Many thanks for pointing me towards Ivy and the github issue. Both very
helpful.

If we could have this support added to math/big or as a new package in
the Go 1.7 timeframe that would be fantastic.

Owen
On Wed, 2016-03-02 at 11:48 +1100, Rob Pike wrote:
Ivy (github.com/robpike/ivy) has implementations of these functions,
but they are not ideally wrapped for general use. I apologize for
putting words in his mouth, but I believe Robert Griesemer has been
thinking about adding some transcendentals to math/big, or more likely
a separate library.



See https://github.com/golang/go/issues/14102



-rob




On Wed, Mar 2, 2016 at 10:59 AM, wrote:

Hi Keith,

we are talking about multi-precision floats (big.Float) not
multi-precision ints (big.Int) : )



Il giorno mercoledì 2 marzo 2016 00:54:43 UTC+1, Keith Randall
ha scritto:

math/big.Exp is the equivalent of math.Pow.

I'm not sure why you would want math.Exp (e^x) or
math.Log (log_e) in an integer library.

math/big.BitLen is approximately math.Log2.



On Tuesday, March 1, 2016 at 3:43:24 PM UTC-8,
alb.do...@gmail.com wrote:

I think it would be nice to have Sqrt, Pow,
Log and Exp in math/big. Everything
else is probably not worth it (at least not in
the standard library).

Il giorno mercoledì 2 marzo 2016 00:34:23 UTC
+1, Owen Waller ha scritto:

Ah ha. Thank you very much Alberto.
This should get me a lot further.

On a more general point. Given that
you have written this, is math/big
might lacking some more functions. Do
you, or anyone else, have an list of
functions that should be added?

This isn't my area by any means, but
if it scratches an itch, I'll offer to
help.

Owen

On Tue, 2016-03-01 at 15:11 -0800,
alb.do...@gmail.com wrote:
For floor you have to use
Float.Int()
(https://golang.org/pkg/math/big/#Float.Int)

I have Sqrt, Log and Pow
implementations here:
https://godoc.org/github.com/ALTree/floatutils

DISCLAIMER: I don't guarantee
correctness of the last decimal
digit

It's not a real library, more like a
few experiments (I'd like to see at
least Sqrt merged in
math/big, but not right now, it's
not tested enough).

Il giorno martedì 1 marzo 2016
21:39:12 UTC+1, Owen Waller ha
scritto:

Hi,

I find myself trying to
covert some Python code to
Go which uses arbitrary
large numbers.
The original Python code
takes the square root and
floors the result of one of
these numbers.

But, looking at Go's
math/big package, I can't
work out how square root one
of these numbers. There
doesn't, at first glance,
seem to be an arbitrary
"pow" function. Likewise the
floor function.

As this isn't my usual area,
I feel don't understanding
something fundamental. Does
anyone have any pointers, or
packages, or example code
that can point me in the
right direction?

Thanks

Owen

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