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"use strict";
var Mexp = function (parsed) {
this.value = parsed
}
Mexp.math = {
isDegree: true, // mode of calculator
acos: function (x) {
return (Mexp.math.isDegree ? 180 / Math.PI * Math.acos(x) : Math.acos(x))
},
add: function (a, b) {
return a + b
},
asin: function (x) {
return (Mexp.math.isDegree ? 180 / Math.PI * Math.asin(x) : Math.asin(x))
},
atan: function (x) {
return (Mexp.math.isDegree ? 180 / Math.PI * Math.atan(x) : Math.atan(x))
},
acosh: function (x) {
return Math.log(x + Math.sqrt(x * x - 1))
},
asinh: function (x) {
return Math.log(x + Math.sqrt(x * x + 1))
},
atanh: function (x) {
return Math.log((1 + x) / (1 - x))
},
C: function (n, r) {
var pro = 1
var other = n - r
var choice = r
if (choice < other) {
choice = other
other = r
}
for (var i = choice + 1; i <= n; i++) {
pro *= i
}
return pro / Mexp.math.fact(other)
},
changeSign: function (x) {
return -x
},
cos: function (x) {
if (Mexp.math.isDegree) x = Mexp.math.toRadian(x)
return Math.cos(x)
},
cosh: function (x) {
return (Math.pow(Math.E, x) + Math.pow(Math.E, -1 * x)) / 2
},
div: function (a, b) {
return a / b
},
fact: function (n) {
if (n % 1 !== 0) return 'NaN'
var pro = 1
for (var i = 2; i <= n; i++) {
pro *= i
}
return pro
},
inverse: function (x) {
return 1 / x
},
log: function (i) {
return Math.log(i) / Math.log(10)
},
mod: function (a, b) {
return a % b
},
mul: function (a, b) {
return a * b
},
P: function (n, r) {
var pro = 1
for (var i = Math.floor(n) - Math.floor(r) + 1; i <= Math.floor(n); i++) {
pro *= i
}
return pro
},
Pi: function (low, high, ex) {
var pro = 1
for (var i = low; i <= high; i++) {
pro *= Number(ex.postfixEval({
n: i
}))
}
return pro
},
pow10x: function (e) {
var x = 1
while (e--) {
x *= 10
}
return x
},
sigma: function (low, high, ex) {
var sum = 0
for (var i = low; i <= high; i++) {
sum += Number(ex.postfixEval({
n: i
}))
}
return sum
},
sin: function (x) {
if (Mexp.math.isDegree) x = Mexp.math.toRadian(x)
return Math.sin(x)
},
sinh: function (x) {
return (Math.pow(Math.E, x) - Math.pow(Math.E, -1 * x)) / 2
},
sub: function (a, b) {
return a - b
},
tan: function (x) {
if (Mexp.math.isDegree) x = Mexp.math.toRadian(x)
return Math.tan(x)
},
tanh: function (x) {
return Mexp.sinha(x) / Mexp.cosha(x)
},
toRadian: function (x) {
return x * Math.PI / 180
},
and: function (a, b) {
return a & b
}
}
Mexp.Exception = function (message) {
this.message = message
}
module.exports = Mexp
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