MATLAB Cheat Sheet updating

Basic commands

Commands	Description
clc	Clear command window
clear	Clear system memory
clear x	Clear x from memory
doc normally distributed numbers	Searching the documentation for a function that creates normally distributed numbers

Standard Matrix and vector operations

Commands	Description
x = [1, 2, 3] or x=[1 2 3]	1x3 (Row) vector defined
x = [1; 2; 3]	3x1 (Column) vector defined
x = [1, 2, 3; 4, 5, 6; 7, 8, 9]	3x3 matrix defined
x = 1:3 or x = 1:1:3	1x3 (Row) vector defined
x = linspace(1,3,3)	function to create vector linspace(_first_,_last_,_number_of_elements_)
x = x'	Transpose x from a row vector to a column vector using the transpose operator '
x = rand(3,3) or x = ones(3,3) or x = zeros(3,3)	Create a 3-by-3 matrix with (random, one, zero) numbers
size(x)	Get Rows and Columns
x(1,:)	Get first row of x matrix
x(:,1)	Get first colum of x matrix
x(end-1,1)	Get the second last row and 1st column
A = [5 6; 7 8] A(3)	If you use only one index with a matrix, MATLAB traverses down each column in order (this code returns the value 6)
density([1 3 6])	Indices can be nonconsecutive numbers to extract the first, third, and sixth elements of density

Operators

Operator	Purpose	Description
+	Addition	A+B adds A and B
+	Unary plus	+A rutruns A
-	Subtraction	A-B subtracts B from A
-	Unary minus	-A negates the elements of A
.*	Element-wise multiplication	A.*B is the element-by-element product of A and B.
.^	Element-wise power	A.^B is the matrix with elements A(i,j) to the B(i,j) power.
./	Right array division	A./B is the matrix with elements A(i,j)/B(i,j).
.\	Left array division	A.\B is the matrix with elements B(i,j)/A(i,j).
.'	Array transpose	A.' is the array transpose of A. For complex matrices, this does not involve conjugation.
~	Ignore output from a function	[~,ivMax] = max(v2) ~ ignore the first output from max() function