# Math Functions in POSTFEKO

View the list of supported math functions.

Shortcut Key Description
ABS Absolute value
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
DD

Polynomial derivative of a function

Syntax: DD(function)

Example: DD(trace1) where trace1 is a trace in the result palette.

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
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
SQRT Square root
STEP

Step function

Syntax: STEP(X) = 0 for X <= 0 and STEP(X) = 1 for X > 0

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.