2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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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,other=n-r,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;
}
};
Mexp.exception=function(message){
this.message=message;
};
module.exports=Mexp;
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