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by srvaldez
Mar 03, 2021 19:28
Forum: General
Topic: square root a la lanczos
Replies: 8
Views: 156

Re: square root a la lanczos

win32-gas 175 ms for FPU sqrt, sum= 66977004.90197226 332 ms for the proxy, sum= 66977016.92774981 win32-gcc -O 2 105 ms for FPU sqrt, sum= 66977004.90197226 135 ms for the proxy, sum= 66977016.91725335 win64-gas64 102 ms for FPU sqrt, sum= 66977004.90197226 280 ms for the proxy, sum= 66977016.9277...
by srvaldez
Mar 03, 2021 17:12
Forum: General
Topic: square root a la lanczos
Replies: 8
Views: 156

Re: square root a la lanczos

@jj2007
if you compile with optimization using gcc the non-asm version will be completely eliminated because the calculations are not used outside the timing loop, that's why I include some kind of sum in the loop and print it out after
by srvaldez
Mar 03, 2021 14:49
Forum: General
Topic: square root a la lanczos
Replies: 8
Views: 156

Re: square root a la lanczos

nice :-)
by srvaldez
Mar 03, 2021 10:02
Forum: General
Topic: square root a la lanczos
Replies: 8
Views: 156

Re: square root a la lanczos

Hi dodicat
minimax approximations are better, I presented my scheme as a novelty, I don't think anyone else would be crazy enough to come up with it
by srvaldez
Mar 03, 2021 3:51
Forum: General
Topic: square root a la lanczos
Replies: 8
Views: 156

square root a la lanczos

just for fun to see if it was possible to approximate functions other than the gamma function using the Lanczos scheme to illustrate I will use a system of linear equations of degree 5, this will not give us much precision but it will show the algorithm lets approximate sqr between 1 and 2, here I w...
by srvaldez
Mar 01, 2021 20:05
Forum: General
Topic: Numeric/String Eval function
Replies: 8
Views: 184

Re: Numeric/String Eval function

hi caseih
I just tried 2^2^3 on Maple 2016 but it complains with "syntax error, ambiguous use of `^`, please use parentheses"
pari/gp evaluates 2^2^3 to 256, FB and C++ give 64
just noticed that Ed's Eval can easily be changed to associativity = rightassoc
by srvaldez
Mar 01, 2021 18:35
Forum: General
Topic: Numeric/String Eval function
Replies: 8
Views: 184

Re: Numeric/String Eval function

thanks Ed :-)
by srvaldez
Mar 01, 2021 1:52
Forum: General
Topic: How to store Erfn() into a string variable
Replies: 10
Views: 191

Re: How to store Erfn() into a string variable

hello jaskin your example is an unfortunate bomb, it seems to overwrites a critical part of memory causing havoc try this example from the FB manual, I added storing to string '' test.bas '' compile with fbc -exx -lang fblite test.bas #lang "fblite" Sub Generate_Error dim as string s On Er...
by srvaldez
Feb 28, 2021 12:38
Forum: General
Topic: Numeric/String Eval function
Replies: 8
Views: 184

Re: Numeric/String Eval function

@Ed Davis
here's challenge for you, how would you add functions of more than one argument like hypot and atan2 ?
by srvaldez
Feb 27, 2021 18:32
Forum: General
Topic: Numeric/String Eval function
Replies: 8
Views: 184

Re: Numeric/String Eval function

nice :-)
by srvaldez
Feb 25, 2021 2:15
Forum: General
Topic: gmp 6.2.1 and mpfr 4.1.0
Replies: 41
Views: 5303

Re: gmp 6.2.1 and mpfr 4.1.0

congrats meucat :-)
by srvaldez
Feb 24, 2021 23:52
Forum: General
Topic: gmp 6.2.1 and mpfr 4.1.0
Replies: 41
Views: 5303

Re: gmp 6.2.1 and mpfr 4.1.0

where is the FreeBASIC-1.07.3-win64-gcc-5.2.0 folder located? is it in restricted area like "C:\Program Files" ? you are only supposed to run the batch file by drag-and-drop the FreeBASIC-1.07.3-win64-gcc-5.2.0 folder onto it anyway, all the batch file does is copy the lib and bi files to ...
by srvaldez
Feb 24, 2021 11:48
Forum: General
Topic: gmp 6.2.1 and mpfr 4.1.0
Replies: 41
Views: 5303

Re: gmp 6.2.1 and mpfr 4.1.0

meucat wrote:(by the way... I still use UBASIC in my old windows XP machine to run arbitrary precision so want to move these ubasic programs to FreeBasic environment)

if you need any trig or exponential functions then I recommend that you use mpfr instead of gmp
by srvaldez
Feb 24, 2021 11:22
Forum: General
Topic: gmp 6.2.1 and mpfr 4.1.0
Replies: 41
Views: 5303

Re: gmp 6.2.1 and mpfr 4.1.0

hi meucat I am at a loss as to why it doesn't work for you, may I ask you that you rename your present FreeBasic folder and install the latest official release from the news section of this forum? also, re-download the gmp+mpfr archive and after extracting it drag-and-drop your new FreeBasic folder ...
by srvaldez
Feb 24, 2021 3:23
Forum: General
Topic: gmp 6.2.1 and mpfr 4.1.0
Replies: 41
Views: 5303

Re: gmp 6.2.1 and mpfr 4.1.0

but.. when I run it only prints almost instantly "automatic casting from mpq 1/3 to mpf" and then program stops with no errors or warnings to check not sure what you mean, but do this, at the end of the program put: Sleep Sleep will cause the program to wait until a key is pressed, this p...

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