Matlab Tutorials

Reading, Writing, and Querying Graphics Image Files

Working with Image Formats

In its native form, a graphics file format image is not stored as a MATLAB matrix, or even necessarily as a matrix. Most graphics files begin with a header containing format-specific information tags, and continue with bitmap data that can be read as a continuous stream. For this reason, you cannot use the standard MATLAB I/O commands load and save to read and write a graphics file format image. Read More

Comparing Handle and Value Classes

Why Select Handle or Value

MATLAB support two kinds of classes — handle classes and value classes. The kind of class you use depends on the desired behavior of the class instances and what features you want to use. Read More

Using the Editor and Debugger with Classes

Referring to Class Files

Define classes in M-files just like scripts and functions. To use the editor or debugger with a class file, use the full class name. For example, suppose the file for a class, myclass.m is in the following location: Read More

Modifying and Reloading Classes

Ensuring MATLAB Uses Your Changes

There is only one class definition for a given class in MATLAB at any given time. When you create an instance of a class, MATLAB loads the class definition. So as long as instances of that class exist, MATLAB does not reload the class definition. Read More

Finding maximum and minimum values in arrays

Let’s write a function file range.m that calculates the difference between the maximum and minimum value in a vector. The file should return a reply. Open an edit window. Create a function file like the one below. Read More

Analysis of Functions, Interpolation, Curve Fitting, Integrals and Differential Equations 2

Localize minima and maxima of functions

Let us try to find the local minima and maxima for the function func(x). The interval of interest is [-6 0]. The algorithms are iterative. There are 2 methods to use. The first one decides x in a given interval, and the second one looks for x around an initial guess. To decide the maxima we are looking for an x that minimizes the negative function: -func(x). Read More

Analysis of Functions, Interpolation, Curve Fitting, Integrals and Differential Equations

In this tutorial we will deal with analysis of functions, interpolation, curve fitting, integrals and differential equations. Firstly, we will need to use polynomials and therefore we have to be familiar with the representation of these. A general polynomial looks like: p(x)=a_nxⁿ + a_n-1x^n-1 +……….+ a₁x + a₀ and is represented by a vector in Matlab:
p=[ aⁿ a^n-1 ....... a¹ a⁰ ] Read More