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Taking part of a matrix. - Isai - 06-30-2021 01:25 PM
Is there any way of take part of a matrix? For example in Matlab it could be A(i:j,m:n) to take from i to j rows and m to n columns.
I know that in HP Prime we could take an element of a matrix, A(i,j).
RE: Taking part of a matrix. - ijabbott - 06-30-2021 02:54 PM
(06-30-2021 01:25 PM)Isai Wrote: Is there any way of take part of a matrix? For example in Matlab it could be A(i:j,m:n) to take from i to j rows and m to n columns.
I know that in HP Prime we could take an element of a matrix, A(i,j).
This operation is called "slicing" the matrix. I don't think there is anything built-in to do it, except in Python/Numpy.
RE: Taking part of a matrix. - robmio - 06-30-2021 03:22 PM
Hi, try using the "SUB" command:
"SUB (Matrix, {rowA, columnA}, {rowB, columnB})".
Look at the attachment.
RE: Taking part of a matrix. - Didier Lachieze - 06-30-2021 04:42 PM
(06-30-2021 01:25 PM)Isai Wrote: Is there any way of take part of a matrix? For example in Matlab it could be A(i:j,m:n) to take from i to j rows and m to n columns.
From the section "Matrix references" in the Prime manual:
Quote:M1({{1,1},{2,2}}) extracts a sub-matrix from the element in the first row and column to the element in the second row and column.
So your Mathlab example for A(i:j,m:n) would translate on the Prime to M1({{i,m},{j,n}})