HP 40gs how to get a submartix from a matrix
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08-31-2023, 11:56 PM
Post: #4
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RE: HP 40gs how to get a submartix from a matrix
Dear Thomas and Gilles,
Thank you both for your replies. I learnt two new things: In python, I learned a way of multiplying matrices: To illustrate: result = U @ M @ V Is not the same as result = U * M * V In the first statement, the "@" does matrix multiplication. But in the second statement, the "*" does element-by-element multiplication. Also learnt that result = V @ M @ U produces [[0 0 0] [0 0 0] [0 0 0]] For the HP 40GS, one can do subsets of matrices: [[1,2,3],[4,5,6],[7,8,9]] STO M1 MAKEMAT(M1,(I+1,J+1),2,2) STO M2. will produce a submatrix [[5,6],[8,9]] Question please Is there a general method to get any 2x2 submatrix from a 3x3 submatrix using MAKEMAT? Eg [[1,3],[7,9]] Thank you Anthony ofvSydney |
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Messages In This Thread |
HP 40gs how to get a submartix from a matrix - Anthony The Koala - 08-31-2023, 04:30 AM
RE: HP 40gs how to get a submartix from a matrix - Thomas Klemm - 08-31-2023, 02:40 PM
RE: HP 40gs how to get a submartix from a matrix - Gilles - 08-31-2023, 03:07 PM
RE: HP 40gs how to get a submartix from a matrix - Anthony The Koala - 08-31-2023 11:56 PM
RE: HP 40gs how to get a submartix from a matrix - Anthony The Koala - 09-01-2023, 02:31 AM
RE: HP 40gs how to get a submartix from a matrix - Thomas Klemm - 09-01-2023, 06:15 AM
RE: HP 40gs how to get a submartix from a matrix - Anthony The Koala - 09-01-2023, 07:27 AM
RE: HP 40gs how to get a submartix from a matrix - carey - 09-03-2023, 08:02 AM
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