#varargin

Trapezoidal rule is the first of the Newton-Cotes closed integration formulas. Geometrically, you should already know how to calculate area of trapezoid.

Same applies here.

We divide area under our function into (equal segments, which means that height (width in this case, because trapezoids are on their sides on x axis) of trapezoids are equal) trapezoids, and we sum up all of the…

Difference between FFT & DFT

Discrete Fourier Transform (DFT)

Fast Fourier Transform (FFT)

Difference between FFT and DFT

FFT is algorithm which calculates DFT. This is the difference (if you can call it that way). Yup.

FFT algorithm requires nlog2n operations. What this means is that for large number of n – FFT algorithm is really fast (you could derive your own algorithm from first…

Passing Functions as Parameters to another Function

You could develop custom function for every new equation but there is a better alternative – design a generic function and pass your particular equation as an argument. Sounds great, right?  In Matlab these functions have special name: function functions.

Before we describe how they work let me first introduce you to anonymous functions.

Anonymous Functions

In short, when you create…

I recently found myself needing to pass the contents of a variable length cell array as arguments to a function that accepted a variable number of arguments (via Matlab's varargin functionality).  I thought this would be a real problem, but was astonished at how easy it was.

Assuming we have a cell array defined as follows:

my_cell_array = {'You', 'Say', 'Aloha', 'I', 'Say', 'Aloha'};

And that we're trying to call Matlab's load() function with the following form:

load(filename, varargin)

All we have to do is the following:

load('some_random_matlab_file.mat', my_cell_array{:})