Abelian sandpile model: Difference between revisions
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=={{header|BQN}}==
<syntaxhighlight lang="bqn">
#!/usr/bin/env BQN
# Takes the size of grid (1 side) and the size of the starting pile as command line arguments
size‿pile←•BQN¨ 2↑•args
_Fp←{𝔽∘⊢⍟≢⟜𝔽_𝕣∘⊢⍟≢⟜𝔽𝕩} # Fixed point function
Sand←{p←𝕩≥4 ⋄ (𝕩+¯4×p)++´⟨«,»,«˘,»˘⟩{𝕎𝕩}¨<p}_Fp # Calculates given sand grid until it stops changing
last←Sand pile˙⌾((⋈˜⌊size÷2)⊸⊑) size‿size⥊0 # Calculate the last state of the sand grid
# PPM output, code taken from https://rosettacode.org/wiki/Bitmap/Write_a_PPM_file#BQN
header_ppm←"P6"∾(@+10)∾(•Repr size)∾" "∾(•Repr size)∾(@+10)∾"255"∾@+10
colors←4⊸↑⌾⌽255×=⌜˜↕3 # Black, Red, Green, Blue
image_ppm←@+⥊colors⊏˜4|last
"sandpile.ppm" •file.Bytes header_ppm∾image_ppm
</syntaxhighlight>
=={{header|C}}==
Writes out the initial and final sand piles to the console and the final sand pile to a PPM file.
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