Chris, Craig, thanks for the help! Both of your suggestions were very helpful.
I found it more convenient to do pretty much exactly as Craig suggests, take
slices and then put them into a regular pdl.
________________________________
From: Craig DeForest <[email protected]>
Sent: Tuesday, August 22, 2017 8:37:54 AM
To: Chris Marshall
Cc: Adam Russell; [email protected]
Subject: Re: [Pdl-general] how to convert a colmn from a PDL::Char to a float?
Chris has the Right answer. If you want a more brute force attack, you could
also fall back on Perl:
my $age_col=$self->data->slice(",0:0");
$age_col = pdl(float, $age_col->list);
(Mobile)
On Aug 21, 2017, at 1:05 PM, Chris Marshall
<[email protected]<mailto:[email protected]>> wrote:
Hi Adam-
PDL::Char data is for arrays of fixed length strings
and I'm not sure how the data conversions and indexing
are handled. If you have columns of data I suggest
taking a look at rcols() which allows you to specify
column separators and whether the data is read into
a PDL or into a perl array. The examples at the bottom
of the rcols documentation (pdldoc rcols from the shell
prompts or help rcols from the pdl2 or perldl shells)
should help with what is possible.
--Chris
On Mon, Aug 21, 2017 at 2:42 PM, Adam Russell
<[email protected]<mailto:[email protected]>> wrote:
Suppose I want to convert the first col of a PDL::Char to a float. When I do
this
my $age_col=$self->data->slice(",0:0");
I get the first column just fine, it looks like this
[
[ '39' ]
[ '50' ]
[ '38' ]
[ '53' ]
[ '28' ]
[ '37' ]
[ '49' ]
[ '52' ]
[ '31' ]
[ '42' ]
[ '37' ]
[ '30' ]
[ '23' ]
[ '32' ]
[ '40' ]
[ '34' ]
]
but if I try and convert it to a float I get a bunch of gibberish?
my $age_col=$self->data->slice(",0:0");
$age_col = float $age_col;
[
[ 'LBdB' ]
[ 'TB@B' ]
[ 'LB`B' ]
[ 'TBLB' ]
[ 'HB`B' ]
[ 'LB\B' ]
[ 'PBdB' ]
[ 'TBHB' ]
[ 'LBDB' ]
[ 'PBHB' ]
[ 'LB\B' ]
[ 'LB@B' ]
[ 'HBLB' ]
[ 'LBHB' ]
[ 'PB@B' ]
[ 'LBPB' ]
]
What am I doing wrong?
I am using PDL:Char because much of the rest of the columns are indeed Strings
and so I thought it wuld make sense to just use PDL::Char to store everything
and then selectively convert a column or two to float as needed.
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org<http://Slashdot.org>! http://sdm.link/slashdot
_______________________________________________
pdl-general mailing list
[email protected]<mailto:[email protected]>
https://lists.sourceforge.net/lists/listinfo/pdl-general
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org<http://Slashdot.org>! http://sdm.link/slashdot
_______________________________________________
pdl-general mailing list
[email protected]<mailto:[email protected]>
https://lists.sourceforge.net/lists/listinfo/pdl-general
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
pdl-general mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/pdl-general
