On Nov 1, 9:35 am, [EMAIL PROTECTED] (Charles) wrote:
>
> I have module from CPAN named Graph. I have created a subroutine for
> this to pass in two arrays; x-axis and y-axis into my Graph subroutine
> i.e. ; &graph( @Xvalues, @Yvalues );
>
> My confusions is: in my subroutine, I cannot treat the two parameters
> (arrays) as separate parameters.
Dear C. Carson,
That's right. In Perl, you usually cannot treat two arrays as
separate parameters. As a result, your line:
graph( @Xvalues, @Yvalues );
is functionally equivalent to the following two lines:
my @array = ( @Xvalues, @Yvalues );
graph( @array );
which I'm guessing is not what you meant.
To do what you want, you need to pass in two scalar values as
parameters (each representing one array), and then extracting the
arrays out in the graph() function. For example, you'd call your
graph() function like this:
graph( [EMAIL PROTECTED], [EMAIL PROTECTED] );
The '\' character (in front of both arrays) returns a scalar reference
to its array, which is then sent into the graph() function.
However, in your graph() function $_[0] and $_[1] will not be set
to the arrays, but rather the references to the arrays. You must do
something like this in your graph() function to de-reference them:
sub graph
{
my @Xvalues = @{ $_[0] }; # remember to use "my"!
my @Yvalues = @{ $_[1] }; # remember to use "my"!
# The @Xvalues and @Yvalues arrays are now set to what you
want.
# (The rest of your code goes here.)
}
I hope this helps, C. Carson.
-- Jean-Luc
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