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function xyz_to_ρ (x, y, z) { | |
return Math.sqrt((x * x) + (y * y) + (z * z)); | |
} | |
function zρ_to_θ (z, ρ) { | |
return Math.acos(z / ρ); | |
} | |
function yx_to_φ (y, x) { | |
return Math.atan(y / x); |
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(define (xyz->ρ x y z) | |
(sqrt (+ | |
(expt x 2) | |
(expt y 2) | |
(expt z 2)))) | |
(define (zρ->θ z ρ) | |
(acos (/ z ρ))) | |
(define (yx->φ y x) |
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export MARKPATH=$HOME/.marks | |
function jump { | |
cd -P $MARKPATH/$1 2>/dev/null || echo "No such mark: $1" | |
} | |
function mark { | |
mkdir -p $MARKPATH; ln -s $(pwd) $MARKPATH/$1 | |
} | |
function unmark { | |
rm "$MARKPATH/$1" | |
} |
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