Re: shell wrappers for trig and other mathematical functions
On 10/1/19 9:18 PM, Dan Hitt wrote:
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
<snip>
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.
As others have shown, this can be done via shell aliases and/or functions.
I really would like stand-alone programs. This would absolutely
minimize any typing,
Shell scripts are an option. I would expect the trade-off would be
flexibility of each script vs. total number of scripts. It's a question
of how far to take the currying.
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).
So, a suite of Perl, Python, etc., and/or shell scripts with a good
architecture for your needs.
CPAN has a huge number of Perl library distributions. The functions you
seek may already be written:
https://www.cpan.org/
Some are available as Debian packages:
2019-10-02 20:24:25 dpchrist@tinkywinky ~/sandbox/bash
$ apt-cache search perl library | wc
491 4329 33481
If not, you can write your own functions in Perl.
And if you are ambitious, you can write your functions in C and bring
them into Perl:
https://perldoc.perl.org/perlxs.html
Thanks again for the suggestion and example!! :)
YW. :-)
David
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