COMSOL 6.2 - Overview of User-Defined Functions

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The following table lists the available user-defined functions:

Table 5-17: User-Defined Functions.
Name	Global	Local	Description
Analytic	√	√	Define a function using an analytic expression and its arguments.
Deep Neural Network	√	√	Define a deep neural network with a data source, training method, and validation data.
Elevation (DEM)	√	√	Define a function by importing geospatial elevation data from digital elevation models (on the DEM file format using the USGS standard
External	√		Define a function by interfacing with other external functions written in the C language.
Function Switch	√	√	A function switch to switch between different functions.
Gaussian Process	√	√	Define a function that represents a Gaussian process for use with the Uncertainty Quantification Module.
Gaussian Pulse	√	√	Define a function that is a Gaussian pulse, the common bell-shaped curve (Gaussian function).
Image	√	√	Define a function by importing an image and map the image’s RGB data to a scalar function output value.
Interpolation	√	√	Create an interpolation function defined by a table or file containing the values of the function in discrete points.
Least-Squares Fit	√	√	Define a function with coefficients based on a least-square fit.
MATLAB	√		Define a MATLAB functions to interface to functions written in MATLAB®. This function requires a LiveLink™ for MATLAB® license.
Normal Distribution	√	√	Define a function that represents a normal distribution.
Partial Fraction Fit	√	√	Create a partial fraction approximation to a function defined by a result table or data from a file.
Piecewise	√	√	Define a function that is created by splicing together several functions, each defined on one interval.
Polynomial Chaos Expansion	√	√	Define a polynomial chaos expansion function. It is intended for use with the Uncertainty Quantification Module.
Ramp	√	√	Define a ramp function — a linear increase.
Random	√	√	Define a function that generates white noise with uniform or normal distribution.
Rectangle	√	√	Define a rectangle function.
Step	√	√	Define a step function — a sharp transition.
Triangle	√	√	Define a triangle function — a linear increase and linear decline.
Waveform	√	√	Define a waveform function: sawtooth, sine, square, or triangle.