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([EMAIL PROTECTED]);
my_R_func_call([EMAIL PROTECTED]);
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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