random number vectors

random number vectors

[matt]

Hello,

Guile lets me make a single random:uniform or a single random:normal. 
It also lets me make a random:normal-vector! but doesn't let me make a 
random:uniform-vector!

http://www.gnu.org/software/guile/manual/html_node/Random.html

Is the reason for this?  There may also be some confusion because the 
term "uniform vector" already means something in guile - a vector 
with uniform numeric type.

Where is the source for random:normal-vector! in 1.8, so that I can copy 
it to make a random:uniform-vector!?  The only reference I found 
/usr/include/libguile/random.h

Kind Regards,
Matt

Re: random number vectors

[Neil Jerram]

matt <matthewm@ifh.ee.ethz.ch> writes:

> Hello,
>
> Guile lets me make a single random:uniform or a single
> random:normal. It also lets me make a random:normal-vector! but
> doesn't let me make a random:uniform-vector!
>
> http://www.gnu.org/software/guile/manual/html_node/Random.html
>
> Is the reason for this?

Probably just a matter of what was needed at the time these functions
were implemented.

> Where is the source for random:normal-vector! in 1.8, so that I can
> copy it to make a random:uniform-vector!?  The only reference I found
> /usr/include/libguile/random.h

In libguile/random.c, look for "SCM_DEFINE (scm_random_normal_vector_x".

Unless you already have a copyright assignment on file for Guile,
though, it's simpler if we add the necessary function and you review
it.  I'm not an expert on this code, but it looks as though all we
need is a copy of scm_random_normal_vector_x with scm_c_normal01
replaced by scm_c_uniform01.  Does that sound right to you?

Regards,
        Neil

Re: random number vectors

[matt]

Yes, that sounds exactly right.   normal01 --> uniform01.

Best,
Matt





On Sun, 19 Jul 2009, Neil Jerram wrote:

> matt <matthewm@ifh.ee.ethz.ch> writes:
>
>> Hello,
>>
>> Guile lets me make a single random:uniform or a single
>> random:normal. It also lets me make a random:normal-vector! but
>> doesn't let me make a random:uniform-vector!
>>
>> http://www.gnu.org/software/guile/manual/html_node/Random.html
>>
>> Is the reason for this?
>
> Probably just a matter of what was needed at the time these functions
> were implemented.
>
>> Where is the source for random:normal-vector! in 1.8, so that I can
>> copy it to make a random:uniform-vector!?  The only reference I found
>> /usr/include/libguile/random.h
>
> In libguile/random.c, look for "SCM_DEFINE (scm_random_normal_vector_x".
>
> Unless you already have a copyright assignment on file for Guile,
> though, it's simpler if we add the necessary function and you review
> it.  I'm not an expert on this code, but it looks as though all we
> need is a copy of scm_random_normal_vector_x with scm_c_normal01
> replaced by scm_c_uniform01.  Does that sound right to you?
>
> Regards,
>        Neil
>