From where this equations?

[9acca9]

Hi all.
I just want to know from where he got this equations? (exact)
This:

Code: Select all

90   w=sq+1 # different numbering system
91   x =int((w-1)/3)+1   # anodes numbers starts 1
92   y =  (2+w)%3   # cathodes number start 0

https://github.com/mdobres/maxnox/blob/master/maxnox.py


thanks all!

[cruster]

Contact him and ask him?

https://github.com/mdobres

Looks like he has a website:

http://chess.fortherapy.co.uk/home/

[trejan]

I just want to know from where he got this equations? (exact)
This:

Code: Select all

90   w=sq+1 # different numbering system
91   x =int((w-1)/3)+1   # anodes numbers starts 1
92   y =  (2+w)%3   # cathodes number start 0

Their code numbers the cells on the 3x3 board from 1 to 9 and those lines convert a cell number into X + Y coordinates to turn on/off a LED. They worked it out themselves as it is an implementation detail for their project and isn't anything complicated.

[deepo]

Looks like he is calculating x and y coordinates to where the LED is represented. So I guess it comes from the layout of the display.
Input is square number (zero based), and output is x and y (both zero based) in an 3x3 matrix.

/Mogens

[davidcoton]

Looks like he is calculating x and y coordinates to where the LED is represented. So I guess it comes from the layout of the display.
Input is square number (zero based), and output is x and y (both zero based) in an 3x3 matrix.

/Mogens

[pedant] It looks like x is 1 based, not 0. Hence, the comments in the code. Why x and y should have different bases is anyone's guess. [/pedant]

[deepo]

Looks like he is calculating x and y coordinates to where the LED is represented. So I guess it comes from the layout of the display.
Input is square number (zero based), and output is x and y (both zero based) in an 3x3 matrix.

/Mogens

[pedant] It looks like x is 1 based, not 0. Hence, the comments in the code. Why x and y should have different bases is anyone's guess. [/pedant]

You, sir, are correct.

[hippy]

I am not quite sure why the code doesn't just use the simpler -

Code: Select all

  x = (sq // 3) + 1
  y = sq % 3

But everyone has their 'off days', can struggle to get their mappings and manipulations to work, will often settle on 'that works, job done, on to the next problem'.