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/* Nonlinear Dependent Sources */
The following mathematical functions defined for real variables can be used in the expressions:
abs(x), acos(x), acosh(x), asin(x), asinh(x), atan(x), atanh(x), cos(x), cosh(x), exp(x), ln(x), log(x), max(x,y), min(x,y), pwr(x,y), pwrs(x,y), sgn(x), sin(x), sinh(x), sqrt(x), tan(x), tanh(x), u(x), uramp(x).
The function "sgn" is the signum function and its value is 1 if the argument is positive or zero and -1 if the argument is negative. The function "u(x)" is the unit step and "uramp(x)" is the integral of the unit step. The
unit step is one if its argument is greater than zero and zero if its argument is less than zero. The
ramp function (uramp) is 0 for argument values less than zero and equal to the argument for argument values
