"Fossies" - the Fresh Open Source Software Archive  

Source code changes of the file "Basic/Pod/Scilab.pod" between
PDL-2.074.tar.gz and PDL-2.075.tar.gz

About: PDL (Perl Data Language) aims to turn perl into an efficient numerical language for scientific computing (similar to IDL and MatLab).

Scilab.pod  (PDL-2.074):Scilab.pod  (PDL-2.075)
skipping to change at line 459 skipping to change at line 459
end } end }
=over 5 =over 5
=item B<Note> =item B<Note>
Never use for-loops for numerical work. Perl's for-loops are faster Never use for-loops for numerical work. Perl's for-loops are faster
than Scilab's, but they both pale against a "vectorized" operation. than Scilab's, but they both pale against a "vectorized" operation.
PDL has many tools that facilitate writing vectorized programs. PDL has many tools that facilitate writing vectorized programs.
These are beyond the scope of this guide. To learn more, see: These are beyond the scope of this guide. To learn more, see:
L<PDL::Indexing>, L<PDL::Threading>, L<PDL::Indexing>, L<PDL::Broadcasting>,
and L<PDL::PP>. and L<PDL::PP>.
Likewise, never use C<1..10> for numerical work, even outside a for-loop. Likewise, never use C<1..10> for numerical work, even outside a for-loop.
C<1..10> is a Perl array. Perl arrays are designed for flexibility, not C<1..10> is a Perl array. Perl arrays are designed for flexibility, not
speed. Use I<ndarrays> instead. To learn more, see the next section. speed. Use I<ndarrays> instead. To learn more, see the next section.
=back =back
=head2 ndarrays vs Perl Arrays =head2 ndarrays vs Perl Arrays
skipping to change at line 689 skipping to change at line 689
=over 5 =over 5
=item L<PDL::Indexing> =item L<PDL::Indexing>
B<Level>: Beginner B<Level>: Beginner
This beginner tutorial covers the standard "vectorization" feature that This beginner tutorial covers the standard "vectorization" feature that
you already know from Scilab. Use this page to learn how to avoid for-loops you already know from Scilab. Use this page to learn how to avoid for-loops
to make your program more efficient. to make your program more efficient.
=item L<PDL::Threading> =item L<PDL::Broadcasting>
B<Level>: Intermediate B<Level>: Intermediate
PDL's "vectorization" feature goes beyond what most numerical software PDL's "vectorization" feature goes beyond what most numerical software
can do. In this tutorial you'll learn how to "thread" over higher dimensions, can do. In this tutorial you'll learn how to "broadcast" over higher dimensions,
allowing you to vectorize your program further than is possible in Scilab. allowing you to vectorize your program further than is possible in Scilab.
=item Benchmarks =item Benchmarks
B<Level>: Intermediate B<Level>: Intermediate
Perl comes with an easy to use benchmarks module to help you find how Perl comes with an easy to use benchmarks module to help you find how
long it takes to execute different parts of your code. It is a great long it takes to execute different parts of your code. It is a great
tool to help you focus your optimization efforts. You can read about it tool to help you focus your optimization efforts. You can read about it
online (L<http://perldoc.perl.org/Benchmark.html>) or through the online (L<http://perldoc.perl.org/Benchmark.html>) or through the
 End of changes. 3 change blocks. 
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