HP_PRIME PYTHON SYNTAX: HP_PPY
cas + pixels cmds
Example with standard CAS notation.
PHP Code:
#cas fract1( X_, Y_, Nmax ):= begin // Mandelbrot fractal, not using symmetry. local x, y, z, c, j, w, h, res1; //freeze; w := 2.7/X_; h := -1.87/Y_; res1 := []; Y_ := Y_-1; for y from 0 to Y_ do c := -2.1 + i*(h*y+0.935); for x from 0 to X_-1 do z := 0; for j from 0 to Nmax-1 do if abs( z := z^2+c )>2 then break; end; end; res1.append( pixon_p( x, y, 126*j+2079 )); c := c+w; end; end; wait(0); return "Done"; //return res1; end; #end
fract1( 320, 240, 10 ); [enter]
As function xcas compatibility
PHP Code:
#cas function fract2( X_, Y_, Nmax ) // Mandelbrot fractal, not using symmetry. local x, y, z, c, j, w, h, res1; w := 2.7/X_; h := -1.87/Y_; res1 := []; Y_ := Y_-1; for y from 0 to Y_ do c := -2.1 + i*(h*y+0.935); for x from 0 to X_-1 do z := 0; for j from 0 to Nmax-1 do if abs( z := z^2+c )>2 then break; end; end; res1.append( pixon_p( x, y, 126*j+2079 )); // Xcas pixon_p -> pixon c := c+w; end; end; wait(0); // Xcas: comment on this line return "Done" ; end; #end
fract2( 320, 240, 10 ); [enter]
deltalist(time(fract2(320,240,10))); // only for Xcas to determine the execution time
using symmetry
PHP Code:
#cas function fract2a( X_, Y_, Nmax ) // Mandelbrot fractal, using symmetry. local x, y, z, c, j, w, h, res1, res2; //freeze; w := 2.7/X_; h := -1.87/Y_; res1:=makelist(-ceiling( X_*Y_/2 )-1); res2 := res1; Y_ := Y_-1; for y from 0 to Y_/2 do c := -2.1 + i*(h*y+0.935); for x from 0 to X_-1 do z := 0; for j from 0 to Nmax-1 do if abs( z := z^2+c )>2 then break; end; end; res1.append( pixon_p( x, y, 126*j+2079 )); res2.append( pixon_p( x, Y_-y, 126*j+2079 )); c := c+w; end; end; wait(0); return "Done"; // return res1,res2; end; #end
With Python syntax.
PHP Code:
#cas def fract3( X_, Y_, Nmax ): local x, y, z, c, j for x in range( X_ ): for y in range( Y_ ): z = 0 c = 2.7*x / X_-2.1 + i*( -1.87*y/Y_ + .935) for j in range( Nmax ): z = z*z + c if abs( z ) > 2: # abs(z = z*z+c)>2: break pixon_p( x, y, 255*20*j + 256 ) wait(0) return "Done" #end
fract3( 320, 240, 10 ); [enter]
XCAS only
PHP Code:
function fract2( X_, Y_, Nmax ) local x, y, z, c, j, w, h, res1; w := 2.7/X_; h := -1.87/Y_; res1 := []; Y_ := Y_-1; for y from 0 to Y_ do c := -2.1+i*(h*y+0.935); for x from 0 to X_-1 do z := 0; for j from 0 to Nmax-1 do if abs( z := z^2+c )>2 then break; end; end; res1.append( pixon( x, y, 126*j+2079 )); // hpprime pixon -> pixon_p c := c+w; end; end; return res1; end
deltalist(time(fract2(320,240,10))); [enter]
XCAS only
PHP Code:
function fract2a( X_, Y_, Nmax ) // Mandelbrot fractal, using symmetry. local x, y, z, c, j, w, h, res1, res2; w := 2.7/X_; h := -1.87/Y_; res1:=makelist(-ceiling( X_*Y_/2 )-1); res2 := res1; Y_ := Y_-1; for y from 0 to Y_/2 do c := -2.1 + i*(h*y+0.935); for x from 0 to X_-1 do z := 0; for j from 0 to Nmax-1 do if abs( z := z^2+c )>2 then break; end; end; res1.append( pixon( x, y, 126*j+2079 )); res2.append( pixon( x, Y_-y, 126*j+2079 )); c := c+w; end; end; return res1,res2; end
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