Matlab #

Matlab is a handy tool for image processing for the following reasons:

Is easy to learn and use: Its syntax is simple, intuitive, and close to everyday language, making it accessible for beginners.
Provides an integrated environment: All necessary tools and functionalities are within a single platform.
Supports rapid development: Prototyping and experimentation can be done quickly, speeding up the development process.
Is platform-independent: It works across Windows, macOS, and Linux systems.
Includes extensive support and documentation: MATLAB is backed by detailed documentation, tutorials, and a large community of users.

Essential MATLAB Commands Cheat Sheet #

Here’s a quick reference for some of the most commonly used MATLAB commands, grouped by category.

Command	Description
`clc`	Clears the command window.
`clear`	Clears all variables from the workspace.
`close all`	Closes all figure windows.
`help`	Provides help for a specific function or command.
`doc`	Opens the documentation for more details.
`load`	Loads variables from a `.mat` file.
`save`	Saves variables to a `.mat` file.

Command	Description
`[a, b; c, d]`	Creates a matrix.
`zeros(m, n)`	Creates an `m x n` matrix of zeros.
`ones(m, n)`	Creates an `m x n` matrix of ones.
`eye(n)`	Creates an `n x n` identity matrix.
`size(A)`	Returns the size of matrix `A`.
`length(A)`	Returns the length of `A` (longest dimension).
`reshape(A, m, n)`	Reshapes `A` into `m x n` matrix.

Command	Description
`A(i, j)`	Accesses element at `i`th row and `j`th column.
`A(:, j)`	Accesses all rows in the `j`th column.
`A(i, :)`	Accesses all columns in the `i`th row.
`A'`	Transposes matrix `A`.
`inv(A)`	Calculates the inverse of `A`.
`sum(A)`	Sums elements in each column of `A`.
`mean(A)`	Calculates the mean of each column in `A`.

Command	Description
`plot(x, y)`	Creates a line plot of `y` vs. `x`.
`title('Title')`	Adds a title to the current plot.
`xlabel('X-axis')`	Labels the x-axis.
`ylabel('Y-axis')`	Labels the y-axis.
`imshow(img)`	Displays an image.
`subplot(m, n, p)`	Creates a subplot grid of `m` by `n` and selects `p`.

Command	Description
`imread('file.png')`	Reads an image file into a matrix.
`imwrite(A, 'file.png')`	Writes matrix `A` to an image file.
`rgb2gray(img)`	Converts an RGB image to grayscale.
`imresize(img, scale)`	Resizes the image by a `scale` factor.

Command	Description
`if condition`	Begins an `if` statement.
`else`	Adds an alternative path in an `if` statement.
`for i = 1:n`	Begins a `for` loop from `1` to `n`.
`while condition`	Begins a `while` loop that runs while `condition` is true.
`break`	Exits a loop immediately.
`continue`	Skips to the next loop iteration.

Command	Description
`fopen('file.txt', 'r')`	Opens a file for reading (`'w'` for writing).
`fread` / `fwrite`	Reads/writes data in binary form.
`fprintf`	Writes formatted data to a file.
`fclose(fileID)`	Closes the opened file.

Name	Description
`Double`	Double-precision, floating-point number in the range approximately -10^308 to 10^308 (8 bytes)
`Uint8`	Unsigned 8-bit integers in the range [0, 255] (1 byte)
`Uint16`	Unsigned 16-bit integers in the range [0, 65,535] (2 bytes)
`Uint32`	Unsigned 32-bit integers in the range [0, 4,294,967,295] (4 bytes)
`Int8`	Signed 8-bit integers in the range [-128, 127] (1 byte)
`Int16`	Signed 16-bit integers in the range [-32,768, 32,767] (2 bytes)
`Int32`	Signed 32-bit integers in the range [-2,147,483,648, 2,147,483,647] (4 bytes)
`Single`	Single-precision floating-point number in the approximate range -10^308 to 10^308 (4 bytes)

Name	Description
zeros(m,n)	Creates an m-by-n matrix of zeros
ones(m,n)	Creates an m-by-n matrix of ones
true(m,n)	Creates an m-by-n matrix of logical ones
false(m,n)	Creates an m-by-n matrix of logical zeros
eye(n)	Returns an n-by-n identity matrix
magic(m)	Returns a magic square of order m
rand(m,n)	Creates an m-by-n matrix with entries uniformly distributed in the interval [0,1]
randn(m,n)	Creates an m-by-n matrix with entries from a normal (Gaussian) distribution with mean 0 and variance 1