MATLAB | Cheat Sheets Collection

💻 Basic Commands

Command	Description
`clc`	Clear command window
`clear`	Clear all variables from workspace
`clear x`	Clear specific variable
`close all`	Close all figure windows
`who / whos`	List variables / with details
`help func`	Get help for function
`doc func`	Open documentation
`pwd`	Current directory
`cd path`	Change directory
`ls / dir`	List files

🔢 Matrix Operations

Command	Description
`A = [1 2; 3 4]`	Create 2x2 matrix
`zeros(m, n)`	Matrix of zeros
`ones(m, n)`	Matrix of ones
`eye(n)`	Identity matrix
`rand(m, n)`	Random matrix (uniform)
`randn(m, n)`	Random matrix (normal)
`linspace(a, b, n)`	n evenly spaced points
`a:step:b`	Range with step
`A'`	Transpose
`A * B`	Matrix multiplication
`A .* B`	Element-wise multiplication
`A ./ B`	Element-wise division
`A .^ n`	Element-wise power
`inv(A)`	Matrix inverse
`det(A)`	Determinant
`eig(A)`	Eigenvalues
`rank(A)`	Matrix rank

📍 Indexing & Slicing

Command	Description
`A(i, j)`	Element at row i, column j
`A(i, :)`	Entire row i
`A(:, j)`	Entire column j
`A(end, :)`	Last row
`A(1:3, :)`	First 3 rows
`A(:)`	All elements as column vector
`size(A)`	Dimensions of matrix
`length(A)`	Largest dimension
`numel(A)`	Number of elements

📐 Math Functions

Command	Description
`sum(A)`	Sum of elements
`mean(A)`	Average
`std(A)`	Standard deviation
`max(A) / min(A)`	Maximum / minimum
`abs(x)`	Absolute value
`sqrt(x)`	Square root
`exp(x)`	Exponential
`log(x) / log10(x)`	Natural / base-10 log
`sin(x) / cos(x) / tan(x)`	Trigonometric functions
`floor(x) / ceil(x)`	Round down / up
`round(x)`	Round to nearest
`mod(a, b)`	Modulo

📈 Plotting

Command	Description
`plot(x, y)`	Basic 2D line plot
`scatter(x, y)`	Scatter plot
`bar(x, y)`	Bar chart
`histogram(data)`	Histogram
`subplot(m, n, p)`	Create subplot grid
`hold on / off`	Keep/clear current plot
`title('text')`	Add title
`xlabel('text')`	X-axis label
`ylabel('text')`	Y-axis label
`legend('a', 'b')`	Add legend
`grid on / off`	Toggle grid
`axis([xmin xmax ymin ymax])`	Set axis limits
`figure`	New figure window
`saveas(gcf, 'file.png')`	Save figure
`surf(X, Y, Z)`	3D surface plot
`mesh(X, Y, Z)`	3D mesh plot
`contour(X, Y, Z)`	Contour plot

⚙️ Programming

Command	Description
`if condition ... end`	Conditional statement
`for i = 1:n ... end`	For loop
`while condition ... end`	While loop
`function y = f(x)`	Define function
`break`	Exit loop
`continue`	Skip to next iteration
`return`	Return from function
`try ... catch ... end`	Error handling
`% comment`	Single-line comment
`%{ ... %}`	Block comment

⌨️ Editor Shortcuts

Shortcut	Description
`F5`	Run script
`F9`	Run selected code
`Ctrl` + `C`	Interrupt execution
`Ctrl` + `Enter`	Run current section
`Ctrl` + `R`	Comment selection
`Ctrl` + `T`	Uncomment selection
`Ctrl` + `I`	Smart indent
`Ctrl` + `D`	Open selected function
`Tab`	Autocomplete
`Up Arrow`	Previous command

📝 Common Patterns

 % Read data from file
data = readmatrix('file.csv');

% Anonymous function
f = @(x) x.^2 + 2*x + 1;

% Find indices where condition is true
idx = find(A > 5);

% Apply function to each element
result = arrayfun(@(x) x^2, A);

% Solve linear system Ax = b
x = A \ b; 