For Those Who Have a HP 39gII



#3

Have you tried the programming on the 39gII? Thoughts? Opinions? Thanks,

Eddie


#4

Hi Eddy,

I tried programming the 39gII, here some elements :

I like :

1- The language is very classic and very powerfull. It is completely integrated in the operating system. It seems a mix between Pascal, C. You can use local or globals functions and variables, you can pass parameters as integer,reals, imaginary numbers, strings, lists, matrix, you can create easily new globals variables or constants... Compare with the Pascal (the old ones, not the object versions), it miss essentially the possibility to create your own type of datas and the pointers possibilities (and the risks of crash with them !). You win list, and list processing possibilities , and dynamic data typing. It s far more powerfull that the old Basics computer

For example here is a program to calculate the square root of a matrix ( given matrix A, find M wher M*M=A

EXPORT MatSqr(m)            // Input : m, a matrix
BEGIN
LOCAL p,d,s,i;
p:=EIGENVV(m); // return a list of 2 matrix 1/ Eigen vectors 2/Eigen values )
d:=p(2); s:=SIZE(d); //We have to calculate the square root for each Eigen Value (on the diagonal)
FOR i FROM 1 TO s(1) DO //For all elements of the diag of the matrix
d(i,i):=√(d(i,i)); //Square root
END
RETURN p(1)*d*p(1)^-1; // result is P*d*P^-1 (char for 1/x on the 39GII)
END

2- it goes very quick !

EXPORT Box(N)
BEGIN
FOR I FROM 1 TO N DO
RECT_P( FLOOR(RANDOM(255);FLOOR(RANDOM(126);
FLOOR(RANDOM(255);FLOOR(RANDOM(126);
0;FLOOR(RANDOM(3)));
END;
FREEZE;
END

Box(n) draws n random size boxes with dark border and random grey level inside.
BOX(100) is immediate

BOX(1000) takes less than 2 sec.

FOR x FROM 0 TO 255 DO
FOR y FROM 0 TO 126 DO
PIXON_P(x,y);
END;
END;

take 3sec , 10.000 pixels/second

3- Lots of graphic commands, includes 'graphic bloc' manipulation

4. Keyboard management (GETKEY etc.). + speed + graphic resolution => easy to write games

5- "Apps" to customize applications

6- Of course you can use list processing in a program

7- Powerfull strings manipulation commands

I like less :

1/ Some bugs. But new versions must and will arrive.

2/ No CAS nor symbolic manipulation possibilities (but you can transform a string to a 'function' and vice versa, you can evaluate a string "3+SIN(A)/B"

3/ The language is verbose. Why not << >> instead of BEGIN END (I like { } for lists ) ? Can be a problem with a small screen and keyboard (even if you have 'skeletons' for some programming structurs

4/ Strictly 'imperative' language on the contrary of 50G RPL (in RPL you can pass program as argument, you can decide to delay the 'EVALuation' of a program, a program can easily create a program ...)

5/ Programs takes a lot a memory compare to the 50G... It' logic when you knows that the cals uses UNICOD characters and store the program both in text + exe mode... Perhaps we could delete the 'text' in the future (if we have a copy on a PC for example..)

I think that the programming possibilities are a major point of the 39gII.


Edited: 1 Aug 2012, 12:07 p.m.


Possibly Related Threads…
Thread Author Replies Views Last Post
  Gathering USB dumps for Connectivity Kit <-> 39gII communication... debrouxl 2 1,710 12-01-2013, 12:59 PM
Last Post: Marcus von Cube, Germany
  New firmware for HP 39gII Mic 6 2,893 11-26-2013, 06:23 PM
Last Post: DeboT
  HP Prime vs. 39gII Connectivity Kit Marcus von Cube, Germany 3 1,779 10-09-2013, 05:44 PM
Last Post: Marcus von Cube, Germany
  [HP 39Gii] - Bug report Jean-Michel 1 1,666 08-28-2013, 10:53 AM
Last Post: Tim Wessman
  hp 39gii lcd clear question giancarlo 7 2,764 08-18-2013, 07:30 AM
Last Post: Mic
  integration on 39gII emulator Wes Loewer 29 7,340 06-07-2013, 05:58 PM
Last Post: Chris Smith
  HP 39gII considered annoying, part 1 Pete Wilson 6 2,315 05-22-2013, 05:08 AM
Last Post: Gilles Carpentier
  Anyone got a 39gII and doesn't mind memory loss? bhtooefr 4 1,805 05-19-2013, 03:57 PM
Last Post: bhtooefr
  Fun things found by running strings on the 39gII emulator bhtooefr 11 3,922 05-16-2013, 12:40 AM
Last Post: Mic
  HP 39GII Undocumented behaviour Bunuel66 0 854 05-12-2013, 05:23 AM
Last Post: Bunuel66

Forum Jump: