Python Speed

[robve]

(04-21-2021 07:34 AM)toml_12953 Wrote:  The new Python interpreter graphics are fast!

I ran three programs to draw a green hat, Here are the runtimes:

HPPL: 7.793 sec
CAS with Python syntax: 25.436 sec
Python (Apr 16 Beta): 0.926 sec

Very nice. My PRIME G2 takes even a bit longer, about 8.2 seconds to run the HPPL program.

I've used the following code, which I've translated to HPPL from the CAS Python code:

Code:

EXPORT pyhat()
BEGIN
  LOCAL XP,XR,YP,YR,ZP,XI;
  LOCAL XF,YF,ZF,ZI,ZT,ZZ;
  LOCAL XL,XT,XX,YY,X1,Y1;
  T:=TICKS; // Save the current clock count for timing program
  // Black out background
  rect_p(0,0,320,240,rgb(0,0,0));
  // Start program proper
  P:=160; Q:=120;
  XP:=144; XR:=1.5*3.1415927;
  YP:=56; YR:=1; ZP:=64;
  XF:=XR/XP; YF:=YP/YR; ZF:=XR/ZP;
  FOR ZI FROM -Q TO Q DO
    IF ZI>=-ZP AND ZI<=ZP THEN
      ZT:=ZI*XP/ZP; ZZ:=ZI;
      XL:=int(.5+sqrt(XP*XP-ZT*ZT));
      // Draw one cross-section of figure
      FOR XI FROM -XL TO XL DO
        XT:=sqrt(XI*XI+ZT*ZT)*XF; XX=XI;
        YY:=(sin(XT)+.4*sin(3*XT))*YF;
        X1:=XX+ZZ+P;
        Y1:=YY-ZZ+Q;
        pixon_p(X1,230-Y1,rgb(0,255,0));
        IF Y1!=0 THEN
          Line_p(X1,230-Y1+1,X1,230); // Erase points below current point
        END;
      END;
    END;
  END;
  T:=TICKS-T;
  // Wait for key and print elapsed time
  FREEZE;
  PRINT((T/1000)+" seconds");
END;

Not sure if the PRIME Python graphics library internals are any different. The Python interpreter presumably uses the hardware floating point support of the Cortex-A7. The fp performance of Python on the HP PRIME is incredibly good: https://tiplanet.org/forum/viewtopic.php...518#HPPPY5 (translated in English with Google translate):

"The HP Prime are really extraordinary in floating point calculation Python and the HP Prime G2 even crushes all competition with its omnipotence, even by doping the latter with overclocking! Both among the solutionsPython official and solutions Python compatible with exam mode, HP Prime G2 is clearly the most powerful either in integer or in floating point calculus, and by far, congratulations!"

Even faster than "doping the competition with overclocking"...

- Rob