HP 49G Series: Update of 48G Exmath

[Gerald H]

Having dug out my 48G I see that the key changes date back to that model.

In the oldest version of Exmath I have, I guess with no changes from the original, number entry is via the A key - Can someone with a 48G & the original Exmath library please check?

[Gerald H]

Updated documentation, should appear on

http://www.hpcalc.org/

shortly:

This library, number 1538, name EXMATH, is an update of Francisco Saenz' programme for the 48G series, now modified to work on 48gII, 49G, 49g+ & 50g.

There are 3 versions for the various models:

49G, OS 1.19-6 uses EXMAT196.LIB Size 6867.5 CkSum 3DA0
49G, OS 2.10-7 EXMATH49.LIB Size 6867.5 CkSum 3DA0
48gII, OS 2.08 EXMATH49.LIB
49g+ & 50g OS 2.10-7 EXMAT50g.LIB Size 6890 CkSum B2B5

The two 49G versions are NOT the same.

Some functions have been added, mostly their names will be self-explanatory.

The function BEST takes two arguments from the stack

Number G with fractional part
Maximum denominator H of fractional approximation

& returns the answer

integer numerator
integer denominator

in stack levels X & Y, this being the best approximation to G below denominator H.

I believe the original for this programme was written by the ubiquitous Joe Horn.

The two functions P159 (Ramanujam's method) & P261 (Euler) return the number of partitions for integer input, the first more quickly & less accurately for large values of input.


CHANGES IN KEYBOARD ACTIVATION

1. Entering numbers is now accomplished through
Right Shift F1
which then demands a mantissa & then an exponent.
2. Exit from Exmath through
Right Shift F6.
3. SWAP is allocated to
Right Cursor Key.


Francisco Saenz' original documentation is included, operation is as he describes with above exceptions.

[Gerald H]

Updated documentation now on hpcalc.org at

http://www.hpcalc.org/details/8702