09-LTspice 常用函数解析

888888

可以用于任何自定义的命令：
.param 参数定义
.dc

Function Name	Description
abs(x) 绝对值	Absolute value of x
acos(x) 反余弦的实部	Real part of the arc cosine of x, e.g., acos(-5) returns 3.14159, not 3.14159+2.29243i
arccos(x)	Synonym for acos()
acosh(x) 反双曲余弦的实部	Real part of the arc hyperbolic cosine of x, e.g., acosh(.5) returns 0, not 1.0472i
asin(x) 反正弦的实部	Real part of the arc sine of x, e.g., asin(-5) returns -1.57080, not -1.57080+2.29243i
arcsin(x)	Synonym for asin()
asinh(x) 反双曲正弦	Arc hyperbolic sine
atan(x) 反正切	Arc tangent of x
arctan(x)	Synonym for atan()
atan2(y,x) 四象限圆弧切线	Four quadrant arc tangent of y/x
atanh(x) 反双曲正切	Arc hyperbolic tangent
buf(x)	1 if x > .5, else 0
cbrt(x) 立方根	Cube root of (x)
ceil(x) 等于或大于x的整数	Integer equal or greater than x
cos(x) 角的余弦	Cosine of x
cosh(x) 双曲cosx	Hyperbolic cosine of x
exp(x) E的x次方	e to the x
fabs(x) abs (x)一样	Same as abs(x)
flat(x) 在-x和x之间有均匀分布的随机数	Random number between -x and x with uniform distribution
floor(x) 等于或小于x的整数	Integer equal to or less than x
gauss(x) 来自高斯分布的随机数和	Random number from Gaussian distribution with sigma of x.
hypot(x,y) 平方和	sqrt(x**2 + y**2)
if(x,y,z) 比较	If x > .5, then y else z
int(x) 取整	Convert x to integer
inv(x) 四舍五入	0. if x > .5, else 1.
limit(x,y,z) x y z的中间值	Intermediate value of x, y, and z
ln(x) x的自然对数	Natural logarithm of x
log(x) ln()的替代语法	Alternate syntax for ln()
log10(x) 以10为底的对数	Base 10 logarithm
max(x,y) x或y的最大值	The greater of x or y
mc(x,y) 一个在x*(1+y)和x*(1-y)之间具有均匀分布的随机数	A random number between x*(1+y) and x*(1-y) with uniform distribution.
min(x,y) x或y的最小值	The smaller of x or y
pow(x,y) x**y的实部	Real part of x**y, e.g., pow(-.5,1.5) returns 0., not 0.353553i
pwr(x,y)	abs(x)**y
pwrs(x,y)	sgn(x)*abs(x)**y
rand(x) 根据x的整数值，0到1之间的随机数	Random number between 0 and 1 depending on the integer value of x.
random(x) 类似于rand()，但是值之间的平滑过渡	Similar to rand(), but smoothly transitions between values.
round(x) 最接近x的整数	Nearest integer to x
sgn(x) x的迹象	Sign of x
sin(x)	Sine of x
sinh(x)	Hyperbolic sine of x
sqrt(x)	Real part of the square root of x, e.g., sqrt(-1) returns 0, not 0.707107i
table(x,a,b,c,d,...)	Interpolate a value for x based on a look up table given as a set of pairs of points.
tan(x)	Tangent of x.
tanh(x)	Hyperbolic tangent of x
u(x)	Unit step, i.e., 1 if x > 0., else 0.
uramp(x)	x if x > 0., else 0.

以下操作按求值优先级的倒序分组:

Operand	Description
& 将表达式两边转换为布尔值，然后是AND	Convert the expressions to either side to Boolean, then AND.
| 将表达式两边转换为布尔值，然后是OR	Convert the expressions to either side to Boolean, then OR.
^ 将表达式两边转换为布尔值，然后是XOR值	Convert the expressions to either side to Boolean, then XOR.
>	True if expression on the left is greater than the expression on the right, otherwise false.
<	True if expression on the left is less than the expression on the right, otherwise false.
>=	True if expression on the left is greater than or equal the expression on the right, otherwise false.
<=	True if expression on the left is less than or equal the expression on the right, otherwise false.
+	Floating point addition
-	Floating point subtraction
*	Floating point multiplication
/	Floating point division
**	Raise left hand side to power of right hand side, only real part is returned, e.g., -2**1.5 returns zero, not 2.82843i