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@xorgy
xorgy / comeonman.js
Last active January 13, 2017 01:35 — forked from CatTail/htmlentity.js
Javascript: encode(decode) html text into html entity
// encode(decode) html text into html entity
function decodeHtmlEntity(str) {
return str.replace(/&#(\d+);/g, function(match, dec) {
return String.fromCharCode(dec);
});
};
function encodeHtmlEntity(str) {
var buf = '';
for (var i = 0; i < str.length; i++) {
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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@xorgy
xorgy / pts.svg
Last active September 16, 2015 12:02
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@xorgy
xorgy / spherical.scm
Last active December 21, 2015 18:18
Util for converting between Cartesian coordinates and spherical coordinates(with the physics symbolic convention).
(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)
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"
}