Compressing multiple columns into one
am 19.06.2008 17:05:07 von Jean-Rene David
Hi,
A little problem I encountered recently.
I have an array of integers and two indexes within
that array. I need to get another array identical
to the first one, except that all cells between
the two indexes (inclusive) must be compressed to
one column which is the sum of the originals
cells.
A program will illustrate below.
What I'm looking for is just a way to do the same
thing more elegantly. It has nested loops using
the same index variable and a duplicated test,
which are both a little ugly.
#!/usr/bin/perl
use warnings;
use strict;
my @array = qw{ 10 20 30 40 50 };
my $start = 1;
my $end = 3;
my @out;
for( my $i = 0; $i < @array; $i++) {
my $j;
for( ; $i >= $start && $i <= $end; $i++) {
$j += $array[$i];
if( $i == $end ) {
push @out, $j;
}
}
push @out, $array[$i];
}
$\="\n";
print for @out;
The expected out is:
10
90
50
The second line contains the sum of elements 1, 2
and 3.
Thanks for any input,
--
JR
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Re: Compressing multiple columns into one
am 20.06.2008 07:26:30 von emenzhaowork
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Hello,
How about this?
my @test = qw(10 20 30 40 50);
splice @test, 1, 3, $test[1]+$test[2]+$test[3];
print "@test";
Thanks,
--Emen
On Thu, Jun 19, 2008 at 4:05 PM, Jean-Rene David wrote:
> Hi,
>
> A little problem I encountered recently.
>
> I have an array of integers and two indexes within
> that array. I need to get another array identical
> to the first one, except that all cells between
> the two indexes (inclusive) must be compressed to
> one column which is the sum of the originals
> cells.
>
> A program will illustrate below.
>
> What I'm looking for is just a way to do the same
> thing more elegantly. It has nested loops using
> the same index variable and a duplicated test,
> which are both a little ugly.
>
> #!/usr/bin/perl
>
> use warnings;
> use strict;
>
> my @array = qw{ 10 20 30 40 50 };
> my $start = 1;
> my $end = 3;
>
> my @out;
> for( my $i = 0; $i < @array; $i++) {
> my $j;
> for( ; $i >= $start && $i <= $end; $i++) {
> $j += $array[$i];
> if( $i == $end ) {
> push @out, $j;
> }
> }
> push @out, $array[$i];
> }
>
> $\="\n";
> print for @out;
>
> The expected out is:
> 10
> 90
> 50
>
> The second line contains the sum of elements 1, 2
> and 3.
>
> Thanks for any input,
>
> --
> JR
>
> --
> To unsubscribe, e-mail: beginners-unsubscribe@perl.org
> For additional commands, e-mail: beginners-help@perl.org
> http://learn.perl.org/
>
>
>
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