New Blog: Factorials

[Eddie W. Shore]

Factorial of Large Numbers

The might of the 50g is demonstrated. It think it is the first time I typed a 181 digit number. Program for the 39gii is included.

Eddie

[Walter B]

Just FYI, all factorials you mentioned in your blog may be calculated directly on a WP 34S in DBLON mode :-)

[Paul Dale]

More importantly, the 34S includes a Log Gamma function which effectively calculates the sum of the logarithms directly.

- Pauli

[Gerson W. Barbosa]

So does the HP-50g, but the wp 34S is more accurate:

001 LBL A

002 INC X

003 LNGamma

004 # 010

005 LN

006 /

007 IP

008 RCL L

009 FP

010 10^x

011 END

111 A   -->   1.76295255109

x<>y    -->            180.

On the HP 50g,

111 ENTER

<< 1. + LOGGAMMA 10.

   LN / DUP IP SWAP FP

   ALOG

>>

EVAL 

will return

                       180.

              1.76295255248

Gerson.

[Eddie W. Shore]

Learning the upgraded WP 34S on my list of things to do.

[Bart (UK)]

Quote:

---

It think it is the first time I typed a 181 digit number.

---

Do it on the 50G emulator, then "Save Object". Run HPUserEdit, then import it with "File" -> "Import" and then you can copy the number. (You can also save it as a variable on the real 50G and copy it to a PC with the SD card, and import into HPUserEdit).

Thanks for your blogs, they're always interesting.

[Eddie W. Shore]

Quote:

---

Do it on the 50G emulator, then "Save Object". Run HPUserEdit, then import it with "File" -> "Import" and then you can copy the number. (You can also save it as a variable on the real 50G and copy it to a PC with the SD card, and import into HPUserEdit).

Thanks for your blogs, they're always interesting.

---

Thank you Bart. Copying the number is a lot easier than typing the number out.

Update:

Bart, I have posted another entry rearding factorials, basically an introduction to factorials - inspired by my dad. (no programs this time though)

Edited: 23 Oct 2012, 9:28 a.m.