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From |
"Feiveson, Alan H. (JSC-SK311)" <alan.h.feiveson@nasa.gov> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: RE: mata (simple): generating random numbers |

Date |
Thu, 1 Nov 2007 15:16:01 -0500 |

Thanks for pointing this out,Tom. I was led astray by "uniform() is the same function as Stata's uniform() function. " After seeing this,I didn't even notice that the arguments were different. But in view of the fact that for some functions, the arguments are not the same in Stata as in Mata, I don't see why the Mata manual can't simply give the correct arguments? As written without arguments, the list in [M-4] does not supply useful information. Al -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Steichen, Thomas J. Sent: Thursday, November 01, 2007 3:01 PM To: statalist@hsphsun2.harvard.edu Subject: st: RE: mata (simple): generating random numbers Al, there is documentation (help mf_uniform): help mata uniform() ------------------------------------------------------------------------ ----------------------- Title [M-5] uniform() -- Uniformly distributed random numbers Syntax real matrix uniform(real scalar r, real scalar c) string scalar uniformseed() void uniformseed(string scalar newseed) void uniformseed(real scalar newseed) Description uniform(r, c) returns an r x c real matrix containing uniformly distributed random numbers 0 < element < 1. uniform() is the same function as Stata's uniform() function. uniformseed() returns uniform()'s current seed in encrypted, string form. uniformseed() returns the same thing as Stata's c(seed); see [D] generate and [P] creturn. uniformseed(newseed) sets the seed: a string previously obtained from uniformseed() may be specified for the argument, or an integer number may be specified. uniformseed() has the same effect as Stata's set seed command; see [D] generate. Conformability uniform(r, c): r: 1 x 1 c: 1 x 1 result: r x c uniformseed(): result: 1 x 1 uniformseed(newseed): newseed: 1 x 1 result: void Diagnostics uniform(r, c) aborts with error if r<0 or c<0. uniformseed(seed) aborts with error if a string seed is specified and it is malformed (was not obtained from uniformseed()). Source code Functions are built in. Also see Manual: [M-5] uniform() Online: [M-4] standard, [M-4] statistical ----------------------------------- Thomas J. Steichen steicht@rjrt.com ----------------------------------- -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Feiveson, Alan H. (JSC-SK311) Sent: Thursday, November 01, 2007 3:47 PM To: statalist@hsphsun2.harvard.edu Subject: st: mata (simple): generating random numbers Hi -I've been frustrated by trying to simply generate random uniforms using uniform()in Mata: Here's what happens: .. mata ------------------------------------------------- mata (type end to exit) --------------------------- : A = 1..5 : E=exp(A) : A 1 2 3 4 5 +---------------------+ 1 | 1 2 3 4 5 | +---------------------+ : E 1 2 3 4 5 +----------------------------------------------------------------------- + 1 | 2.718281828 7.389056099 20.08553692 54.59815003 148.4131591 | +----------------------------------------------------------------------- + : F=normal(A) : F 1 2 3 4 5 +----------------------------------------------------------------------- + 1 | .8413447461 .9772498681 .998650102 .9999683288 ..9999997133 | +----------------------------------------------------------------------- + : U=uniform() wrong number of arguments for uniform() r(3000); : U=uniform():*1 wrong number of arguments for uniform() r(3000); : U=uniform():*A wrong number of arguments for uniform() r(3000); What am I doing wrong? Also, nowhere in the Mata manuals can I find anything about what arguments the statistical functions take. After going to interactive "help', I finally found out they were the same as the Stata function arguments. So if that's true, why doesn't "uniform()" work? Al Feiveson * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ ----------------------------------------- CONFIDENTIALITY NOTE: This e-mail message, including any attachment(s), contains information that may be confidential, protected by the attorney-client or other legal privileges, and/or proprietary non-public information. If you are not an intended recipient of this message or an authorized assistant to an intended recipient, please notify the sender by replying to this message and then delete it from your system. Use, dissemination, distribution, or reproduction of this message and/or any of its attachments (if any) by unintended recipients is not authorized and may be unlawful. * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: mata (simple): generating random numbers***From:*"Feiveson, Alan H. (JSC-SK311)" <alan.h.feiveson@nasa.gov>

**st: RE: mata (simple): generating random numbers***From:*"Steichen, Thomas J." <SteichT@rjrt.com>

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