Math Functions in POSTFEKO

View the list of supported math functions.

Shortcut Key	Description
ABS	Absolute value
ARCCOS	Arccosine (radians)
ARCCOT	Arccotangent (radians)
ARCSIN	Arcsine (radians)
ARCTAN	Arctangent (radians)
ATAN2	Arctangent of Y/X in the range -PI to PI Syntax: `ATAN2(X,Y)`
CEIL	Smallest integer value that is equal or greater than the argument
COS	Cosine (radians)
COSH	Hyperbolic cosine (radians)
COT	Cotangent (Radians)
DD	Polynomial derivative of a function Syntax: `DD(function)` Example: `DD(trace1)` where `trace1` is a trace in the result palette.
DEG	Convert radians to degrees
EXP	Exponential function
FFT	Fast Fourier transforms of a real function. The bandwidth can be provided as additional argument. Syntax: `FFT(a,[,bandwidth])` Example: `FFT(U_re, 1e3)` where `U_re` is a trace in the result palette.
FLOOR	Largest integer value that is equal to or smaller than the argument
FMOD	Resulting reminder of a/b. Syntax: `FMOD(a, b)`
IFFT	Inverse Fast Fourier transform of a complex function. The resulting range can be specified as additional argument. Syntax: `IFFT(a[,T])` Example: `IFFT((U_re)w+i(U_im)*w,1e-3)` where `U_re`, `U_im` and `w` are traces in the result palette.
IMAG	Determines the imaginary component
LN	Computes the natural logarithm Syntax: `LN(a)` Example: `LN(trace1)` where `trace1` is a trace in the result palette.
LOG	Computes logarithm base 10
MAX	Returns the largest of the two arguments Syntax: `MAX(a, b)`
MIN	Returns the smallest of the two arguments Syntax: `MIN(a, b)`
NORM	Normalise a function Syntax:`NORM(a)` Example: `NORM(trace1 + trace2)` where `trace1` and `trace2` are traces in the result palette.
ONES	Creates a list of points with a constant value 1 Syntax: `ONES(from, to, samplePoints)`
PEAK	Returns the peak value in the given range of values Syntax: `PEAK(a)` Example: `trace1*PEAK(trace2)` where `trace1` and `trace2` are traces in the result palette.
PHASE	Determines the phase
RAD	Convert degrees to radians
RAMP	Ramp function Syntax: `RAMP(from, to, samplePoints)` Example: `RAMP(0,1e-3,2001)`
REAL	Determines the real component
SELF	A reference to the current trace
SIN	Sine (Radians)
SINH	Hyperbolic sine (Radians)
SQRT	Square root
STEP	Step function Syntax: `STEP(X) = 0 for X <= 0` and `STEP(X) = 1 for X > 0`
TAN	Tangent (Radians)
TANH	Hyperbolic tangent (radians)
ZEROS	Creates a list of points with a constant value of 0 Syntax: `ZEROS(from, to, samplePoints)`

Predefined Variables

Table 1. List of predefined variables.
Variable	Description
i	Imaginary unit
j	Imaginary unit
c0	The speed of light in free space in m/sec.
eps0	The permittivity of free space in F/m.
mu0	The permeability of free space in H/m.
pi	The mathematical constant (Ludolph’s number).
zf0	The characteristic impedance of free space in Ohm.