Matlab Cheat Sheet

• MATLAB–Python–Julia cheatsheet

Dependencies and Setup¶

In the Python code we assume that you have already run importnumpyasnp

Matlab Cheatsheet Marcel Neidinger [email protected] Basics Deﬁning variables and functions% Variables y = 42;% Function with one return function y = SomeFunc(p1,p2)% function definiton goes here% Assign return val by assigning% the variable y = 42; end% Function with multiple returns function A,z = SomeFunc(p1,p2)% Function body end. Download the MATLAB Cheat Sheet. PDF (recommended) PDF (2 pages) Alternative Downloads. PDF (black and white) LaTeX Please login or register so you can rate this cheat sheet! Latest Cheat Sheet. 1 Page (0) Unit 7 chp 23 notes Cheat Sheet. Automated Machine Learning (AutoML): automate difficult and iterative steps of. AMatlabCheat-sheet(MIT18.06,Fall2007) Basics: save'file.mat' savevariablestofile.mat load'file.mat' loadvariablesfromfile.mat diaryon recordinput/outputtofilediary.

In the Julia, we assume you are using v1.0.2 or later with Compat v1.3.0 or later and have run usingLinearAlgebra,Statistics,Compat

Creating Vectors¶

Operation

MATLAB

Python

Julia

Row vector: size (1, n)

Column vector: size (n, 1)

1d array: size (n, )

Not possible

or

Integers from j to n withstep size k

Linearly spaced vectorof k points

Creating Matrices¶

Operation

MATLAB

Python

Julia

Create a matrix

2 x 2 matrix of zeros

2 x 2 matrix of ones

2 x 2 identity matrix

Diagonal matrix

Uniform random numbers

Normal random numbers

Sparse Matrices

Tridiagonal Matrices

Manipulating Vectors and Matrices¶

Operation

MATLAB

Python

Julia

Transpose

Concatenate horizontally

or

or

Concatenate vertically

or

or

Reshape (to 5 rows, 2 columns)

Convert matrix to vector

Flip left/right

Flip up/down

Repeat matrix (3 times in therow dimension, 4 times in thecolumn dimension)

Preallocating/Similar

N/A similar type

Accessing Vector/Matrix Elements¶

Operation

MATLAB

Python

Julia

Access one element

Access specific rows

Access specific columns

Remove a row

Diagonals of matrix

Get dimensions of matrix

Mathematical Operations¶

Operation

MATLAB

Python

Julia

Dot product

Matrix multiplication

Inplace matrix multiplication

Not possible

Element-wise multiplication

Matrix to a power

Matrix to a power, elementwise

Inverse

or

or

Determinant

Eigenvalues and eigenvectors

Euclidean norm

Solve linear system(Ax=b) (when (A)is square)

Solve least squares problem(Ax=b) (when (A)is rectangular)

Sum / max / min¶

Operation

MATLAB

Python

Julia

Sum / max / min ofeach column

Sum / max / min of each row

Sum / max / min ofentire matrix

Cumulative sum / max / minby row

Cumulative sum / max / minby column

Programming¶

Operation

MATLAB

Python

Julia

Comment one line

Comment block

For loop

While loop

If

If / else

Print text and variable

Function: anonymous

Function

Tuples

Can use cells but watch performance

Named Tuples/Anonymous Structures

Closures

Inplace Modification

No consistent or simple syntaxto achieve this

fprintf

%4.2f in the formatSpec input specifies that the first value in each line of output is a floati­ng-­point number with a field width of four digits, including two digits after the decimal point. %8.3f in the formatSpec input specifies that the second value in each line of output is a floati­ng-­point number with a field width of eight digits, including three digits after the decimal point. n is a control character that starts a new line.

Line Properties

Color:
red = r
green = g
blue = b
cyan = c
magenta = m
yellow = y
black = k
white = w
none
LineStyle:
solid line = -
dashed line = --
dotted line = :
dash dotted line = -.
no line = none
Marker:
circle = o
plus sign = +
asterisk = * point = .
cross = x
square = square or s
diamond = diamond or d
none = none
Marker­Edg­eColor & Marker­Fac­eColor:
same as color
Marker­Indices

max fprintf

%d in the formatSpec input prints each value in the vector, round(a), as a signed integer.