geo3954's articles:

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automatic acceptance of subscripts/superscripts. 1 24 (1/26/2008 5:59:15 PM) comp.text.tex The most frequent mistakes I make when entering TeX instructions are of this type: entering x_13 rather than x_{13} or y^23 rather than y^{23} Are there any easy fixes that would provide automatic acceptance... George

Fortran and C: United with a KISS 7 41 (6/23/2007 7:10:23 PM) comp.lang.fortran I have recently posed questions to this group: Form t = a*x+c in 64 bits, get top and bottom 32 bits of t Form k = i + j and test for overflow Such problems arise in certain kinds of random number generation--... George

Form k = i + j and test for overflow. 109 41 (6/18/2007 8:45:17 PM) comp.lang.fortran My recent query on use of Fortran to carry out the essential operation for multiply-with-carry: Form t = a*x+c in 64 bits, get top and bottom 32 bits of t led to a number of interesting responses, and my co... George

Form t=a*x+c in 64 bits, get top and bottom 32 bits of t. 37 29 (6/14/2007 3:02:54 PM) comp.lang.fortran Assembler instructions for most CPUs permit forming the 64-bit product of two 32-bit integers, then access to the top and bottom parts. Such operations provide the essentials for a class of random number gener... George

Help changing an old postscript plot. 3 30 (7/13/2004 7:01:44 PM) comp.lang.postscript I have postscript file containing four plots, the sources of which are no longer available. One of the four plots has a legend: 4. Relative error, Hart, Cody and AS66. which I must change to 4. ... George

Creating and writing to files "on the fly" 2 24 (8/3/2003 2:46:24 PM) comp.lang.c I have a set of, say, 2000 points in the 8-dimensional simplex S={(x_1,x_2,...,x_8),x_1+x_2+...+x_8=1, x's>=0}. To help analyze that 8-dimensional set, I wish to project the set of points onto each of the... George

Assigning unsigned long to unsigned long long 1 43 (7/8/2003 4:49:43 PM) comp.lang.c The essence of a multiply-with-carry RNG is to have declarations in the RNG proc, such as unsigned long mwc( ){ static unsigned long x = 123456789, c = 362436; unsigned long long t, a = 916905990LL... George

geo3954's replies:

Items(6) /1

When (32-bit) double precision isn't precise enough 5 21 (9/10/2003 5:21:29 PM) comp.lang.c I've been trying to perform a calculation that has been running into an underflow (insufficient precision) problem in Microsoft Excel, which calculates using at most 15 significant digits. For this purpose... david.schulman2 (1)

'erf' function in C 26 34 (2/14/2004 11:39:40 PM) comp.lang.c Hi, Are there any C compilers which have the erf function (from probability) as part of their math libraries? Or are there any math libraries available to download which implement this function? ... jph500 (1)

Form t=a*x+c in 64 bits, get top and bottom 32 bits of t. 37 29 (6/14/2007 3:02:54 PM) comp.lang.fortran Assembler instructions for most CPUs permit forming the 64-bit product of two 32-bit integers, then access to the top and bottom parts. Such operations provide the essentials for a class of random number gener... geo3954 (22)

Form k = i + j and test for overflow. 109 41 (6/18/2007 8:45:17 PM) comp.lang.fortran My recent query on use of Fortran to carry out the essential operation for multiply-with-carry: Form t = a*x+c in 64 bits, get top and bottom 32 bits of t led to a number of interesting responses, and my co... geo3954 (22)

Fortran and C: United with a KISS 7 41 (6/23/2007 7:10:23 PM) comp.lang.fortran I have recently posed questions to this group: Form t = a*x+c in 64 bits, get top and bottom 32 bits of t Form k = i + j and test for overflow Such problems arise in certain kinds of random number generation--... geo3954 (22)

simple PRNG? 75 55 (3/21/2008 6:00:09 AM) comp.lang.c Can anyone point me to a simple, fast RRNG function to generate random ints within a specified range? It is important that each value within the range has the same probability (uniform distribution). I do not... copx (116)