1. Operator table
| operator | describe | example | result |
|---|---|---|---|
| + | add | 4+7 | 11 |
| - | reduce | 4-7 | -3 |
| * | take | 4*7 | 11 |
| / | divide (integer division will truncate the result) | 7/3 | 2 |
| % | modulo (remainder) | 6%4 | 2 |
| ^ | Power (exponential operation) | 3^3 | 27 |
| |/ | square root | |/36 | 6 |
| ||/ | cube root | ||/8 | 2 |
| ! | factorial | 5! | 120 |
| !! | factorial (prefix operator) | !!5 | 120 |
| @ | absolute value | @-5.0 | 5 |
| & | Binary AND | 31&15 | 15 |
| | | binary OR | 31|15 | 31 |
| # | binary XOR | 31#15 | 16 |
| ~ | Binary NOT | ~1 | -2 |
| << | binary shift left | 1<<8 | 256 |
| >> | binary right shift | 16>>3 | 2 |
2. Function table
"dp" stands for double precision.
| operator | describe | example | result |
|---|---|---|---|
| abs(x) | absolute value | abs(-23.7) | 23.7 |
| cbrt(dp) | cube root | cbrt(8) | 2 |
| ceil/ceiling(dp或numeric) | the smallest integer not less than the argument | ceil(-38.1) ceil(38.1) ceiling(38.1) | -38 39 39 |
| degrees(dp) | Convert radians to degrees | degrees(1) | 57.29577951308232 |
| exp(dp or numeric) | natural index | exp(1) | 2.7182818284590452 |
| floor(dp或numeric) | largest integer not greater than the argument | floor(-42.8) floor(-42.8) | -43 42 |
| ln (dp or numeric) | Natural logarithm | ln(2.7182818284590452) | 1.0000000000000000 |
| log(dp or numeric) | base 10 logarithm | log(1000) | 3 |
| log(b numeric,x numeric) | logarithm to base b | log(2,32) | 5.0000000000000000 |
| mod(y,x) | remainder of y/x (modulo) | mod(7,3) | 1 |
| pi() | π constant | pi() | 3.141592653589793 |
| power(a dp or numeric, b dp or numeric) | a to the power of b | power(2,3) | 8 |
| radians(dp) | Convert angles to radians | radians(45) | 0.7853981633974483 |
| random() | random number between 0 and 1 | random() | 随机返回一个小数 |
| round(dp或numeric) | 圆整为最接近的整数(四舍五入) | round(36.5) | 37 |
| round(v numeric,s int) | 圆整为s位小数(四舍五入) | round(36.5252,2) | 36.53 |
| setseed(dp) | 为随后的random()调用设置种子(0到1之间) | setseed(0.123) | 每次种子后，重现相同随机数 |
| sign(dp或numeric) | 参数的符号(-1,0,+1) | sign(-8.4) | -1 |
| sprt(dp或numeric) | 平方根 | sqrt(9) | 3 |
| trunc(dp或numeric) | 截断(向零靠近) | trunc(42.8) | 42 |
| trunc(v numeric,s int) | 截断为s位小数 | trunc(42.4382,2) | 42.43 |
| width_bucket(op numeric,b1 numeric,b2 numeric,count int) | 返回包含count等宽柱的柱状图中operand所在的柱的编号，范围从low到high，超出该范围的输入则返回0或计数+1 | width_bucket(5.35,0.024,10.06,5) | 3 |
| acos(x) | 反余弦 | acos(1) acos(-1) | 0 3.141592653589793 |
| asin(x) | 反正弦 | asin(0) asin(1)*2 | 0 3.141592653589793 |
| atan(x) | 反正切 | atan(1) | 0.7853981633974483 |
| atan2(x,y) | x/y的反正切 | atan2(1,1) | 0.7853981633974483 |
| cos(x) | 余弦 | cos(pi()) cos(0) | -1 1 |
| cot(x) | 余切 | cot(0) | Infinity |
| sin(x) | 正弦 | sin(0) sin(pi()/2) | 0 1 |
| tan(x) | 正切 | tan(pi()/4) | 0.9999999999999999 |