MATLAB Cheat Sheet
Key MATLAB syntax for matrices, control flow, function definitions, and plotting used in numerical computing.
2 PagesBeginnerApr 15, 2026
Basics
Variables and output.
matlab
% Variables and basic I/Ox = 42;name = 'MATLAB';disp(x)fprintf('Value: %d\n', x)y = 3.14 % without semicolon, prints result
Matrices
Creating and operating on matrices.
matlab
A = [1 2 3; 4 5 6; 7 8 9]; % 3x3 matrixB = zeros(3,3);C = A'; % transposeD = A * B; % matrix multiplicationE = A .* A; % element-wise multiplicationv = A(2,:); % second roww = A(:,1); % first columninvA = inv(A); % matrix inverse (if invertible)
Control Flow
Loops and conditionals.
matlab
for i = 1:5 fprintf('i = %d\n', i);endx = 10;if x > 5 disp('big')elseif x == 5 disp('equal')else disp('small')endwhile x > 0 x = x - 1;end
Functions
Defining and calling functions.
- function y = f(x)- Defines a function; typically one per .m file
- nargin / nargout- Number of input/output arguments actually supplied
- anonymous function- f = @(x) x^2; creates an inline function handle
- size(A) / length(v)- Dimensions of a matrix / length of a vector
- disp / fprintf- Print a value / print formatted text
Plotting
Basic 2D plotting.
matlab
x = linspace(0, 2*pi, 100);y = sin(x);plot(x, y)xlabel('x')ylabel('sin(x)')title('Sine Wave')grid on
Pro Tip
Preallocate arrays with zeros()/ones() before loops — growing arrays dynamically inside a loop is one of the most common MATLAB performance killers.
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