Some of Python's linalg commands in HP Prime

05082021, 01:49 PM
Post: #1




Some of Python's linalg commands in HP Prime
Matrix Format [ [ row ], [ row ], … [ row ] ]
linspace(start, stop, number of points desired + 1) arange(start, stop, step size); default step size: 1; returns a 1 row array from start to stop using step size identity(n): returns an identity matrix as n x n transpose(matrix): transpose of a matrix inv(matrix): inverse of a matrix shape(matrix): returns the dimensions of the matrix in an ordered pair (row, columns) rref(matrix): row reduced echelon form of a matrix det(matrix): determinant of a square matrix peval(array of coefficients, x): polynomial evaluation (order is from high to low), can take complex arguments horner(array of coefficients, x): polynomial evaluation using Horner’s method pceoff(array of roots): returns an array representing a polynomial’s coefficients, can take complex arguments proot(array of coefficients): returns an array of roots, can take complex arguments add(array, array) or add(matrix, matrix): addition element by element sub(array, array) or sub(matrix, matrix): subtraction element by element dot(array, array): dot product cross(array, array): cross product imag(complex number): imaginary part – works on arrays and matrices real(complex number): real part – works on arrays and matrices I believe that fft and ifft have to do with fast fourier transforms. 

05082021, 11:00 PM
Post: #2




RE: Some of Python's linalg commands in HP Prime
thanks Eddie.
(05082021 01:49 PM)Eddie W. Shore Wrote: I believe that fft and ifft have to do with fast fourier transforms. yup; the integrated Help has a few examples… Cambridge, UK 41CL/DM41X 12/15C/16C DM15/16 71B 17B/BII/bII+ 28S 42S/DM42 32SII 48GX 50g 35s 30b/WP34S Prime G2 & Casios, Rockwell 18R :) 

05092021, 05:36 PM
Post: #3




RE: Some of Python's linalg commands in HP Prime
Those sound like the function names from the Prime CAS and the 50g.
BTW, pcoeff is misspelled. 

05092021, 05:58 PM
Post: #4




RE: Some of Python's linalg commands in HP Prime  
05112021, 06:47 PM
Post: #5




RE: Some of Python's linalg commands in HP Prime
oops, sorry, my comment re Help of course refers to the CAS commands, whereas this thread is about Python… I need more coffee.
Cambridge, UK 41CL/DM41X 12/15C/16C DM15/16 71B 17B/BII/bII+ 28S 42S/DM42 32SII 48GX 50g 35s 30b/WP34S Prime G2 & Casios, Rockwell 18R :) 

09082021, 10:10 PM
Post: #6




RE: Some of Python's linalg commands in HP Prime
(05082021 01:49 PM)Eddie W. Shore Wrote: Matrix Format [ [ row ], [ row ], … [ row ] ] Hi, I found it difficult to transpose a matrix with PYTHON. For instance: transpose ([[1,2,3], [4,5,6]]) gives me this result: [[1,4], [3,2], [5,6]] The correct result is: [[1,4], [2,5], [3,6]]. Is there a bag perhaps? 

09102021, 04:55 AM
Post: #7




RE: Some of Python's linalg commands in HP Prime
There is indeed a bug in transpose for non square matrices.


09112021, 09:13 AM
Post: #8




RE: Some of Python's linalg commands in HP Prime
(09102021 04:55 AM)parisse Wrote: There is indeed a bug in transpose for non square matrices. Thanks for the answer, Parisse. Since I had to use the "transpose" command in my Python program, I had to write a subroutine to transpose the arrays: Code:


09112021, 10:36 AM
Post: #9




RE: Some of Python's linalg commands in HP Prime
(09112021 09:13 AM)robmio Wrote: Since I had to use the "transpose" command in my Python program, I had to write a subroutine to transpose the arrays ... Is matrix simply list of list ? If yes, we can transpose with a 1liner. >>> transpose = lambda a: [list(r) for r in zip(*a)] >>> transpose([[1,2,3], [4,5,6]]) [[1, 4], [2, 5], [3, 6]] 

09112021, 11:17 AM
Post: #10




RE: Some of Python's linalg commands in HP Prime
(09112021 10:36 AM)Albert Chan Wrote:(09112021 09:13 AM)robmio Wrote: Since I had to use the "transpose" command in my Python program, I had to write a subroutine to transpose the arrays ... Congratulations! This short solution you proposed works very well in my program 

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