On Sunday 16 July 2006 13:20, Charles K. Clarkson wrote:
> Daniel D Jones wrote:
> : Ah! Simple change:
>
>Subroutines should not normally operate on external data.
What do you mean by "operate on?" I avoid altering external data, but I don't
see the harm in reading external data. Too, thi
Daniel D Jones wrote:
: Ah! Simple change:
Subroutines should not normally operate on external data.
Pass data into and out of each subroutine. As a matter of style,
I avoidsqashingwordsinvariableandsuborutinenamesalltogether. I
like to use an underscore for most names.
run_tests( [EMAIL P
Daniel D Jones schreef:
> Given something like the following:
>
> my @variables = [3, 7, 13, 4, 12];
> my @tests = ("2*a+b==c", "c-d+a==e");
>
> I need to be able to evaluate the mathematical truth of the tests
#!/usr/bin/perl
# beware: this approach is wrong
use warnings;
use strict;
my
On Sunday 16 July 2006 07:26, Paul Johnson wrote:
> On Sun, Jul 16, 2006 at 05:48:10AM -0400, Daniel D Jones wrote:
> > It certainly does help. I thought about substitution but couldn't
> > come up with a syntax. This seems to be exactly what I was looking
> > for, but I'm running into a problem.
On Sun, Jul 16, 2006 at 05:48:10AM -0400, Daniel D Jones wrote:
> It certainly does help. I thought about substitution but couldn't
> come up with a syntax. This seems to be exactly what I was looking
> for, but I'm running into a problem. Here's code which demonstrates
> it:
[ ... ]
> As you
On Saturday 15 July 2006 21:13, Rob Dixon wrote:
> Daniel D Jones wrote:
> > Given something like the following:
> >
> > my @variables = [3, 7, 13, 4, 12];
>
> You want round brackets here. You've created an array with just one
> element, with a reference to an anonymous array as its value.
Doh
John W. Krahn wrote:
>
> Rob Dixon wrote:
>>
>>s/([a-z])/$variables[ord($1) - ord('a')]/ge;
>
> You don't need the /e option there. (Try it if you don't believe me.)
Fascinating. Thanks John. And all because the expression's inside an array
index.
s/([a-z])/$variables[do{
my $n = ord(
Rob Dixon wrote:
>
> You can do exactly that in Perl, and a lot more simply:
>
> my @variables = (3, 7, 13, 4, 12);
> my @tests = ("2*a+b==c", "c-d+a==e");
>
> foreach (@tests) {
> s/([a-z])/$variables[ord($1) - ord('a')]/ge;
You don't need the /e option there. (Try it if you don't b
On Jul 15, 2006, at 5:15 PM, Daniel D Jones wrote:
Given something like the following:
my @variables = [3, 7, 13, 4, 12];
As an aside, you meant parentheses here, not brackets. (Brackets
return a reference to an anonymous array containing the list, not the
list itself.)
my @tests = ("2
Daniel D Jones wrote:
> Given something like the following:
>
> my @variables = [3, 7, 13, 4, 12];
You want round brackets here. You've created an array with just one element,
with a reference to an anonymous array as its value.
> my @tests = ("2*a+b==c", "c-d+a==e");
>
> I need to be able to
On 7/15/06, Daniel D Jones <[EMAIL PROTECTED]> wrote:
my @variables = [3, 7, 13, 4, 12];
my @tests = ("2*a+b==c", "c-d+a==e");
I need to be able to evaluate the mathematical truth of the tests,
May I suggest Parse::RecDescent? If you can make a grammar out of your
algebra, you'll have an easy
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