GP Beta Test Forum

this was one of my first programs in GP

there is nothing religious about this post. i'm not jewish but i've always been fascinated by calendars and the formulas behind them. the hebrew calendar is special because its formula evolved from apparent astrological and seasonal observations throughout history and its current form involves a lot...

i'm attaching functions for converting Excel serial dates to YMD dates and back. Excel serial dates represents the number of days since 12/31/1899 . Excel has a bug - it treats 1900-2-29 as a leap date when in fact it's invalid, since 1900 is not a leap year. These 2 functions replicate the same beh...

the challenge of pentominoes is to fit all 12 pieces (each piece having 5 cells) to cover an area of 60 cells. amazingly, these 12 pieces can fully cover these rectangles: 6x10, 5x12, 4x15 and 3x20, each rectangle having an area of 60 cells of course. the pieces can also cover an 8x8 chessboard with...

From wikipedia: A knight's tour is a sequence of moves of a knight on a chessboard such that the knight visits every square only once. If the knight ends on a square that is one knight's move from the beginning square (so that it could tour the board again immediately, following the same path), the ...

i wrote this program as a way of learning GP by immersion. It's the classic 8-queens problem of putting 8 queens on a chessboard such that no queen is under attack by any other queen. (the program displays the placement of the 8 queens on the chessboard for half a second after each solution is found...

gee thanks!

here's another one of my "useless" (but fun!) projects - a sudoku solver. enter the puzzle board as a long string of nine segments (separated by a space), each segment consisting of 9 digits (0 means blank cell) corresponding to pattern of digits in each row. a couple of puzzles are supplied for cut...

worked like a charm! thanks for the quick response! (i just have to remember to use PNG formats)

i have a small app that performs some process against a supplied image - during"regular" (interpreted) mode it allows the user to select file from the drop down part of the 'copy costume..' block. when exported to app as is, the executable works but it doesn't allow the selection of an image. it use...