*To*: David Christensen <dpchrist@holgerdanske.com>*Cc*: debian-user <debian-user@lists.debian.org>*Subject*: Re: shell wrappers for trig and other mathematical functions*From*: Dan Hitt <dan.hitt@gmail.com>*Date*: Tue, 1 Oct 2019 21:18:13 -0700*Message-id*: <[🔎] CAOphiz+_06DQtoP0NOzbR4BuvMu9oCpY79AFt5zHdYih9puquQ@mail.gmail.com>*In-reply-to*: <[🔎] bf98c73f-4937-1352-8664-538c89a37954@holgerdanske.com>*References*: <[🔎] CAOphizJnMAXDnLRaMNRUGpC2A7W6S03nJGXb2Pgk53wF71WRzw@mail.gmail.com> <[🔎] bf98c73f-4937-1352-8664-538c89a37954@holgerdanske.com>

On Tue, Oct 1, 2019 at 8:58 PM David Christensen <dpchrist@holgerdanske.com> wrote:

On 10/1/19 8:32 PM, Dan Hitt wrote:

> I'm half-way looking for some shell wrappers for common trig functions like

> sin, cos, exp, log, and others.

>

> I'm aware of bc, but it seems cumbersome.

>

> I would like to just type 'sin 1' and get the sine (of 1 radian),

Perl one-liners are an option:

2019-10-01 19:25:59 dpchrist@tinkywinky ~

$ perl -e 'print sin 1'

0.841470984807897

> or type 'log 2'

2019-10-01 20:48:52 dpchrist@tinkywinky ~

$ perl -e 'print log 2'

0.693147180559945

> and get the natural or maybe common log of 2. (Probably any such

> program should do something intelligent when faced with multiple or zero

> arguments, such as computing the sine or log of each, so that they could be

> chained together. And maybe such a program would pay attention to

> environment variables or optional command line arguments to tune its

> behavior.)

>

> These kinds of programs would be super-easy to write in just about any

> language (i guess perhaps even just as bash functions which shell out to bc

> for at least some of the simpler functions) but before i actually do

> something like that, i wonder if somebody has already done it, whether

> there exist any standards or good ideas, etc. (Because if somebody has a

> good, thoughtful exp program, for example, then it could be cookie-cutter

> copied to a bunch of other functions.)

>

> There is a precedent of sorts in Paul Rubin's factor program, which is just

> oh-so-handy when you're wondering how an integer factors, but don't want to

> start up some heavy-weight system just to find out.

2019-10-01 20:49:17 dpchrist@tinkywinky ~

$ apt-cache search libmath-prime-util-perl

libmath-prime-util-perl - utilities related to prime numbers, including

fast sieves and factoring

> Thanks in advance for any pointers or advice! :)

>

> dan

David

Hi David,

Thanks so much for your reply, including the apt-cache searching part.

It does look like a way to quickly get values for sine (or any other function in perl).

However, i would like to dispense entirely with the 'perl -e' and 'print' part. I really would like stand-alone programs. This would absolutely minimize any typing, and if the programs had a set of good conventions, then they would provide a model for writing others if the functions i want are not already available in perl (or other interpreter).

Thanks again for the suggestion and example!! :)

dan

**Follow-Ups**:**Re: shell wrappers for trig and other mathematical functions***From:*David Wright <deblis@lionunicorn.co.uk>

**Re: shell wrappers for trig and other mathematical functions***From:*mick crane <mick.crane@gmail.com>

**Re: shell wrappers for trig and other mathematical functions***From:*Will Mengarini <seldon@eskimo.com>

**Re: shell wrappers for trig and other mathematical functions***From:*Greg Wooledge <wooledg@eeg.ccf.org>

**Re: shell wrappers for trig and other mathematical functions***From:*David Christensen <dpchrist@holgerdanske.com>

**References**:**shell wrappers for trig and other mathematical functions***From:*Dan Hitt <dan.hitt@gmail.com>

**Re: shell wrappers for trig and other mathematical functions***From:*David Christensen <dpchrist@holgerdanske.com>

- Prev by Date:
**Re: shell wrappers for trig and other mathematical functions** - Next by Date:
**Re: shell wrappers for trig and other mathematical functions** - Previous by thread:
**Re: shell wrappers for trig and other mathematical functions** - Next by thread:
**Re: shell wrappers for trig and other mathematical functions** - Index(es):