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From: Joel VanderWerf on 2 Jun 2010 20:01
Jason Lillywhite wrote:
> Joel VanderWerf wrote:
>> snip
>
> Thank you Joel.
>
> is this redshift you introduced to me the same thing as
>
> http://sourceforge.net/projects/redshift/

Yes, that's the same thing (but there is no formal release on that site).


From: Colin Bartlett on 2 Jun 2010 23:44
[Note: parts of this message were removed to make it a legal post.]

On Fri, May 28, 2010 at 4:20 PM, Jason Lillywhite <
jason.lillywhite(a)gmail.com> wrote:

> Here is my attempt at Newton's second law in Ruby:
> ...
> What if I needed more speed but still wanted it in Ruby?
>

Using C for the "fast" bits has been suggested.

As an alternative to C for speed, I've found that using JRuby with parts of
the code as Java functions works well.

Perhaps I ought to add that I've never tried compiling a C program and
integrating it with Ruby, because of my lack of knowledge of the finer - and
not so finer! - points of C compilation and integration with Ruby. But I've
found writing and compiling parts of the code that need to be fast fairly
easy in Java, and integration of Java with JRuby is also fairly
straightforward.

From: brabuhr on 7 Jun 2010 15:12
On Wed, Jun 2, 2010 at 11:44 PM, Colin Bartlett <colinb2r(a)googlemail.com> wrote:
> On Fri, May 28, 2010 at 4:20 PM, Jason Lillywhite <
> jason.lillywhite(a)gmail.com> wrote:
>
>> Here is my attempt at Newton's second law in Ruby:
>>   ...
>> What if I needed more speed but still wanted it in Ruby?
>>
>
> Using C for the "fast" bits has been suggested.
>
> As an alternative to C for speed, I've found that using JRuby with parts of
> the code as Java functions works well.

I took a quick shot w/ duby-inline.

Host:
2.6.32-22-generic #33-Ubuntu SMP Wed Apr 28 13:27:30 UTC 2010 i686 GNU/Linux
Intel(R) Pentium(R) M processor 1.60GHz

Benchmark block:
100000.times{ velocity(0.5, 21.6, 600, 10, 0.0) }

"Original" code (see note below):

ruby 1.8.7 (2010-01-10 patchlevel 249) [i486-linux]
user system total real
18.210000 0.040000 18.250000 ( 21.596111)

jruby 1.5.0 (ruby 1.8.7 patchlevel 249) (2010-05-12 6769999) (OpenJDK
Client VM 1.6.0_18) [i386-java]
user system total real
4.525000 0.000000 4.525000 ( 4.525000)

jruby 1.5.0 (ruby 1.8.7 patchlevel 249) (2010-05-12 6769999) (OpenJDK
Server VM 1.6.0_18) [i386-java]
user system total real
3.651000 0.000000 3.651000 ( 3.651000)

Duby code:

jruby 1.5.0 (ruby 1.8.7 patchlevel 249) (2010-05-12 6769999) (OpenJDK
Client VM 1.6.0_18) [i386-java]
0.415000 0.000000 0.415000 ( 0.415000)

jruby 1.5.0 (ruby 1.8.7 patchlevel 249) (2010-05-12 6769999) (OpenJDK
Server VM 1.6.0_18) [i386-java]
0.208000 0.000000 0.208000 ( 0.208000)


I had to cheat a little bit and removed the array and the block to
make it Duby-compatible:

G = 9.8

class Newton
def rb_velocity(c, m, t, dt, vi)
t += dt
steps = t/dt

i = 0
while i < steps
v = vi
vi = v + ( G - c/m*v) * dt
i += 1
end

vi
end
end

And, the duby version:

require 'inline'
require 'duby_inline'

G = 9.8

class Newton
inline :Duby do |builder|
builder.duby "
def db_velocity(c:double, m:double, t:int, dt:int, vi:double)
t += dt
steps = t/dt

i = 0
while i < steps
v = vi
vi = v + ( #{G} - c/m*v) * dt
i += 1
end

vi
end
"
end
end

From: Joel VanderWerf on 7 Jun 2010 15:36
Joel VanderWerf wrote:
> Jason Lillywhite wrote:
...
>> is this redshift you introduced to me the same thing as
>>
>> http://sourceforge.net/projects/redshift/
>
> Yes, that's the same thing (but there is no formal release on that site).

It's a gem now:

gem install redshift


From: Jason Lillywhite on 7 Jun 2010 15:44
unknown wrote:
> Duby code:
> ...snip

I'm sorry, can you tell me what Duby is? I tried looking it up and found
nothing. I'm familiar with JRuby but not Duby.

Thank you.
--
Posted via http://www.ruby-forum.com/.

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