- MATLAB/Octave Python Description; sqrt(a) math.sqrt(a) Square root: log(a) math.log(a) Logarithm, base $e$ (natural) log10(a) math.log10(a) Logarithm, base 10.
- Today's Pick comes to us from us. (Sounds circular, but power-user us apparently doesn't like capitals-or three-letter names!). In rex: a pedestrian regular expression operator synopsis generator, us has provided a very handy cheat sheet, of sorts, for creating Regular Expressions. For those of you who haven't yet delved the mysteries of.
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
All cheat sheets, round-ups, quick reference cards, quick reference guides and quick reference sheets in one page. A Matlab Cheat-sheet (MIT 18.06, Fall 2007.
Color:red = r
green = g
Matlab Cheat Sheet For Beginners
blue = bcyan = 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
mean
plot examples
plot examples
sum
fprintf
%d in the formatSpec input prints each value in the vector, round(a), as a signed integer.building arrays/loops
max loop
- MATLAB–Python–Julia cheatsheet
Dependencies and Setup¶
In the Python code we assume that you have already run importnumpyasnp
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 |
Regexp Matlab Cheat Sheet
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 | |||
Complex conjugate transpose(Adjoint) | |||
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 | ||
Broadcast a function over acollection/matrix/vector | Functions broadcast directly | Functions broadcast directly |
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¶
Matlab Quick Reference Sheet
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 |