May 292013

Re: HP PRIME GRAPHING CALCULATOR – Technical data and performance comparison with others.

a month ago



I think it’s important to precise that all of this is absolutely not official.

Perhaps these specs are true. Perhaps not … At this stage, it’s only rumors. The only official annoncement is the video and noting on specs inside.





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Posts: 2,160
Registered: ‎02-09-2009
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Re: HP PRIME GRAPHING CALCULATOR – Technical data and performance comparison with others.

[ Edited ]

a month ago – last edited a month ago

Hi!, all:


The first program, of Fractals, for HP PRIME GRAPHING CALCULATOR, from …


LOCAL iter := 0;
LOCAL z := (0,0);
WHILE (ABS(z) <= bailoutValue) AND (iter < maxIter) DO
z := z*z+c;
iter := iter+1;
RETURN iter;

Ndx := ROUND(Ndx*186,0);
IF Ndx < 31 THEN RETURN 0+ 1*Ndx; END;
IF Ndx < 62 THEN RETURN 31+ 32*(Ndx-31); END;
IF Ndx < 93 THEN RETURN 1023- 1*(Ndx-62); END;
IF Ndx < 124 THEN RETURN 992+ 1024*(Ndx-93); END;
IF Ndx < 155 THEN RETURN 32736- 32*(Ndx-124); END;
IF Ndx < 186 THEN RETURN 31744+ 1*(Ndx-155); END;
RETURN 31775;

colorize(itVal, maxIt)
IF itVal==maxIt THEN
// We are inside the Mandelbrot map
// Then the pixel is drawn in blackRETURN 0;
RETURN LSclr(itVal/maxIt);

EXPORT Mandelbrot()
// Clean the screen (G0):RECT();

LOCAL dx, dy, c, xp, yp;
LOCAL iter, color;

// These 4 variables defined
// Our window of the complex plane

LOCAL xmin, xmax, ymin, ymax;
LOCAL maxIterations := 50;
LOCAL maxRadius := 2;

// Location
// Radio width to height should be 4:3

xmin := -2.5;
xmax := 1.5;
ymin := -1.5;
ymax := 1.5;

// Other parameters better:

//xmin := 0.315625;
//xmax := 0.515625;
//ymin := 0.28125;
//ymax := 0.43125;

dx := (xmax-xmin)/320;
dy := (ymax-ymin)/240;
c := (xmin,ymin);

// we loop over each pixel
// Of the screen wil Prime:
FOR yp FROM 0 TO 239 DO
FOR xp FROM 0 TO 319 DO
// Create the complex number c
// We need for iteration:

c := (xmin+xp*dx, ymax-yp*dy);

// Now iterate the formula and
// Return the number of iteration steps
// That was taken up
// That the complex number jump out
// The radius of convergence:

iter := iteration(c, maxRadius, maxIterations);

// Determines a color for the iteration number:color := colorize(iter, maxIterations);

// Change color to that pixel:

PIXON_P(xp, yp, color);

// deja la imagen en la pantalla
// hasta que se presiona una tecla:



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 Posted by at 8:44 pm
May 252013

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 Posted by at 4:38 pm
May 212013

Latitude, Longitude,
And Great Circles

This page describes how to work with Latitude and Longitude in Excel and how to compute Great Circle Distances.


You can use Excel’s trigonometric and time functions to work with Latitude and Longitude values. There are two different ways express geographical coordinates. The first is to use a time format of degrees:minutes:seconds. This is the same format as an Excel time value. The other method is to use decimal degrees, representing values as the number of degrees as a real number. For example, the location 20 degrees, 30 minutes, 40 seconds can be represented as the time 20:30:40 or in decimal degrees as 20.51111.

download You can download the file with all the example formulas and code on this page.
 Posted by at 5:20 am