Re: How to add two array data into one GD plot?

[BrowserUk]

As the labels remain the same for the two datasets, just add the second (and subsequent) set(s) of values to the first array:

#! perl -slw
use strict;
use GD::Graph::bars;

my @d1 = (
    [ "2010/03/29 14:00:00", "2010/03/29 14:00:00" ],
    [ 13, 15 ],
    [ 20, 21 ],
    [ 4, 9 ],
);

my $graph = GD::Graph::bars->new(1000, 800);

open PNG, '>:raw', "$0.png" or die $!;
print PNG $graph->plot( \@d1 )->png;
close PNG;
system "$0.png";

Produces:this graph.

[heinz_zh]

Hi BrowersUk,

Actually, I have made a mistake, could you help me again, I mean date might be different. As I would like gather these two data plots into one bars.

@data1 = ( 
   ["2010/03/29 14:00:00","2010/03/29 14:00:00"],
   [13,15]
);


@data2 = ( 
   ["2010/04/29 14:00:00","2010/04/29 14:00:00"],
   [20,21]
);

[BrowserUk]

Hm. You could just combine the two datasets into a single dataset. But that doesn't produce a very inspiring graph:

#! perl -slw
use strict;
use GD::Graph::bars;

my @d1 = (
    [ "2010/03/29 14:00:00", "2010/03/29 14:00:00", "2010/04/29 14:00:
+00", "2010/04/29 14:00:00" ],
    [ 13, 15, 20, 21 ],
);
my $g1 = GD::Graph::bars->new( 1000, 800 );
my $img1 = $g1->plot( \@d1 );

open PNG, '>:raw', "$0.png" or die $!;
print PNG $img1->png;
close PNG;
system "$0.png";

or maybe you need to retain two datasets and just combine the labels, to give this:

#! perl -slw
use strict;
use GD::Graph::bars;

my @d1 = (
    [ "2010/03/29 14:00:00", "2010/04/29 14:00:00" ],
    [ 13, 15 ],
    [ 20, 21 ],
);
my $g1 = GD::Graph::bars->new( 1000, 800 );
my $img1 = $g1->plot( \@d1 );

open PNG, '>:raw', "$0.png" or die $!;
print PNG $img1->png;
close PNG;
system "$0.png";

.

Or maybe I've combined the values the wrong way and what you want is this

#! perl -slw
use strict;
use GD::Graph::bars;

my @d1 = (
    [ "2010/03/29 14:00:00", "2010/04/29 14:00:00" ],
    [ 13, 20 ],
    [ 15, 21 ],
);
my $g1 = GD::Graph::bars->new( 1000, 800 );
my $img1 = $g1->plot( \@d1 );

open PNG, '>:raw', "$0.png" or die $!;
print PNG $img1->png;
close PNG;
system "$0.png";

And maybe you want a gap between the two this

#! perl -slw
use strict;
use GD::Graph::bars;

my @d1 = (
    [ "2010/03/29 14:00:00", undef, "2010/04/29 14:00:00" ],
    [ 13, undef, 20 ],
    [ 15, undef, 21 ],
);
my $g1 = GD::Graph::bars->new( 1000, 800 );
my $img1 = $g1->plot( \@d1 );

open PNG, '>:raw', "$0.png" or die $!;
print PNG $img1->png;
close PNG;
system "$0.png";