How does one get polynomial features like in python but for MatLab?

13 vues (au cours des 30 derniers jours)
Brando Miranda
Brando Miranda le 16 Oct 2017
Is there code that gets the polynomial features of a vector like in:
e.g. for 1D 1,x,x^2 for degree 2. Ideally like the link I posted.
Ideally, is there no built in function in matlab that does this for me?

Réponses (2)

Sanjana Ramakrishnan
Sanjana Ramakrishnan le 19 Oct 2017
Modifié(e) : Walter Roberson le 11 Jan 2018
There is not a direct way of creating a polynomial matrix in MATLAB. Refer the below link for information on polynomial matrices:
However, you can create a vector of polynomial coefficients in MATLAB to represent a polynomial: https://www.mathworks.com/help/matlab/math/create-and-evaluate-polynomials.html
You can then append the vectors vertically to form a polynomial matrix

Steven Lord
Steven Lord le 12 Jan 2018
For one variable, I think you want the vander function.
For multiple variables, use the x2fx function from Statistics and Machine Learning Toolbox. If you want terms with a degree greater than 2 (like x1.^2.*x2, with a degree of 2+1 = 3) you'd have to build the model input rather than using one of the predefined options like 'quadratic'. I believe there are some discussions on Answers and some files on the File Exchange for generating all combinations of N numbers that add up to a particular value that you could use to help you build the model input in that case.

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