Replace data inside GD::Graph::Data object

taiq_m has asked for the wisdom of the Perl Monks concerning the following question:

I have the below piece of code and a problem is when I am trying to plot a graph from a csv file where i have replaced the 0s with undef, the undef still gets plotted as undef. I have turned on show_values and I see the undef. It is taking undef as a string.

cat test.csv
1,undef,2
2,3,undef

my $data = GD::Graph::Data->new();
$data->read(file => '/tmp/test.csv', delimiter => ',');
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Comment on Replace data inside GD::Graph::Data object Download Code

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Re: Replace data inside GD::Graph::Data object by huck (Prior) on Mar 14, 2017 at 02:14 UTC
Comming from a file, csv or not, undef is just another text string, unlike in perl code where undef has a specific meaning to the compiler	[reply]
Re^2: Replace data inside GD::Graph::Data object by taiq_m (Acolyte) on Mar 14, 2017 at 02:27 UTC
thanks huck - i kind of got it, question is how do i replace it ? can I access the data with in the Graph:Data object ?	[reply]
Re^3: Replace data inside GD::Graph::Data object by taiq_m (Acolyte) on Mar 14, 2017 at 04:18 UTC
figured out, it works `foreach my $arr (@$data) { @$arr = map {$_ eq "undef" ? undef : $_ } @$arr; }` [download]	[reply] [d/l]