| Re: tested random # generator? [message #7003] |
Mon, 16 September 1996 00:00 |
offenbrg
Messages: 31
Registered: August 1993
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Member |
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Tim Patterson <tim@raptor.lpl.arizona.edu> writes:
> Fronefield Crawford wrote:
>>
>> Does anyone have a random number generator written in IDL that's been
>> tested to work? I've tried linking in ran1.c (from Numerical Recipes)
>> via call_external, but I am having trouble doing that. For me it would
>> be easiest to use a routine already written in IDL would be best. Many
>> thanks.
>>
>> Froney Crawford
>> crawford@mit.edu
> In IDL 4.0.1 there are two routines RANDOMN and RANDOMU that
> generate random floating point numbers. I don't know if these
> were available in earlier versions.
> Tim
RANDOMU and RANDOMN have been around for quite a while. Note, however,
that these are not true random number generators, but are pseudo-random
number generators...I don't know of an actual random number generator that
works in IDL.
Joel
--
"...And I am unanimous in this" - Mrs. Slocumbe
------------------------------------------------------------ ----------
| Joel D Offenberg | offenbrg@fondue.gsfc.nasa.gov |
| Hughes STX, NASA/GSFC/LASP | UIT Sci team & COBE Unix SysAdm |
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| Re: tested random # generator? [message #7016 is a reply to message #7003] |
Fri, 13 September 1996 00:00  |
Tim Patterson
Messages: 65
Registered: October 1995
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Member |
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Fronefield Crawford wrote:
>
> Does anyone have a random number generator written in IDL that's been
> tested to work? I've tried linking in ran1.c (from Numerical Recipes)
> via call_external, but I am having trouble doing that. For me it would
> be easiest to use a routine already written in IDL would be best. Many
> thanks.
>
> Froney Crawford
> crawford@mit.edu
In IDL 4.0.1 there are two routines RANDOMN and RANDOMU that
generate random floating point numbers. I don't know if these
were available in earlier versions.
Tim
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| Re: tested random # generator? [message #7023 is a reply to message #7016] |
Fri, 13 September 1996 00:00 |
peter
Messages: 80
Registered: February 1994
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Member |
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Fronefield Crawford (crawford@space.mit.edu) wrote:
: Does anyone have a random number generator written in IDL that's been
: tested to work? I've tried linking in ran1.c (from Numerical Recipes)
: via call_external, but I am having trouble doing that. For me it would
: be easiest to use a routine already written in IDL would be best. Many
: thanks.
IDL> print, randomn(seed,5)
-0.921359 0.709662 -0.0300814 0.556668 0.0501184
IDL> print, randomu(seed,5)
0.0368400 0.169594 0.364733 0.0678048 0.594544
Seems to work...
Peter
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