convert string to number?
Hi,
I have a problem where a number read from a file is being treated as a
string by perl (I think!). I am using the module RSPerl which is an
interface between Perl and the statistical language R. When i read a
column of numbers from a file and pass it to the perl/R function i get
an "invalid 'type' (character) of argument" error.
The reason i think this is a problem on the Perl side is shown by this
pseudocode:
while(<FILE>){
... stuff to extract $value from each row ...
push(@list1, $value);
}
@list2 = (100.2, 232.333, 344.2); # these are the numbers from file
my_R_func_call(\@list1);
my_R_func_call(\@list2);
using @list1 gives the error, @list2 does not. if i add a line that
performs a redundant mathematical operation on $value before push'ing it
into @list1 eg
if($value < 1000000000000){}
push(@list1, $value);
then the error goes away, therefore i suspect this is a problem with the
internal datatype. I have never worried about this in Perl before, but
it appears to be more important now as R is more strict.
is there a way in Perl to force a variable to be a number rather than a
string?
thanks
adam
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awitney
7/7/2006 8:18:03 AM
perl.macosx
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Hi Adam, sounds like the symptoms you'd get if the value you're sending to R has a newline character hanging on the end. Perl will do the conversion to an integer when required [1], but if you're passing such a thing to R it'll probably get grumpy. Just chomp the line before doing the extraction of the values and with any luck all will be well. [1] For example... #!/usr/bin/perl use warnings; use strict; my $string="98\n"; my $sub=$string-10; print "OK we now have $sub\n"; =====>>>> OK we now have 88 Cheers, Paul
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paul
7/7/2006 12:20:27 PM
On 2006=9607=9607, at 10:18, Adam Witney wrote: > is there a way in Perl to force a variable to be a number rather =20 > than a > string? Yes. You already discovered it: perform a redundant mathematical =20 operation on it. The usual idiom is to add zero to it. (Conversely, =20 to force something to be a string, append an empty string to it.) What's happening internally is that (among other things), perl =20 variables can accommodate for both string and numeric representations =20= of the variable's value, but they're filled in lazily: a string is =20 not converted to a number until the variable is used in a numeric =20 context (and vice versa). Despite this laziness, Perl is usually able =20= to do what you mean as far as numbers and strings are concerned, but =20 sometimes you have to give it a hint. For more information, see the =20 perlnumber man page. --=20 Dominic Dunlop
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shouldbedomo
7/7/2006 12:26:54 PM
On Jul 7, 2006, at 3:18 AM, Adam Witney wrote: > then the error goes away, therefore i suspect this is a problem > with the > internal datatype. I have never worried about this in Perl before, but > it appears to be more important now as R is more strict. I'd call this a bug in the RSPerl code, actually. If it's looking for a number, it should use the SvNV() or SvIV() macros (to get a double or integer, respectively). I suspect it's using SvIOK() or SvNOK(), which don't attempt to do any automatic coercion. This forces you, the caller, to do it. Check out the first couple pages of `perldoc perlguts` for the details. -Ken
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ken
7/11/2006 4:23:45 AM
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