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- 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 |
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 |
Python Cheat Sheet 2019 Ppr
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) |
Python List Cheat Sheet
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 Isnapshot 3 2 0. | 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 |
