[HP49G] Very poor graphing performances

[Han]

(08-25-2015 08:40 AM)Bruno Wrote:  Hi All,

While I'm comparing graphing capabilities beetween my HP48S/GX/49G,
I was wondering seeing that in some cases the 48S was faster than the 48GX, and the 48GX was faster than the 49G !

In fact, the 48GX and the 49G INFORM's dialogs add extra computation time VS a simple << ERASE DRAX DRAW >> .

But, the 3D graphing tools show me an even bigger computation time difference, see below :


Benchmarked calculators :

HP48S ROM rev J + SUITE3D 4.0
HP48GX ROM rev M (the slowest I own, only 3.6Mhz !)
HP49G ROM 2.10-7
HP49G ROM 1.24
HP49G+ ROM 2.15


Benchmark test (from the HP48GX Graphics book by Ray Depew) :

PPAR / VPAR:

EQ: 'SIN(X)*SIN(Y)'
XVOL: -PI PI
YVOL: -PI PI
ZVOL: -1 1
XXRNG: -PI PI
YYRNG: -PI PI

WIREFRAME:
X-STEP: 10
Y-STEP: 8
PS-CONTOUR:
X-STEP: 20
Y-STEP: 16

Program:

<< << ERASE DRAW >> TIMED >>
(TIMED: from HP48 Insight by Bill Wicks)


Benchmark results:

WIREFRAME:

HP48S: 44.33s
HP48GX: 32.45s
HP49G: 47.98s


PS-CONTOUR:

HP48S: 2mn 52s
HP48GX: 5mn 03s
HP49G: 18mn 09s
HP49G+: 4mn 54s


Is there any flags that can explain why the HP49G was so slow ?

On the HP49, did you specify the plot parameters as "real" numbers and not "integers" ? The algorithms for the plots are based on "real" input. Any non-real input is automatically converted, and adds overhead.