Post Reply 
Multi-Dimensional Matrices
04-12-2017, 05:48 PM
Post: #1
Multi-Dimensional Matrices
The code below checks OK but doesn't run. Is it possible to have n-dimensional tables? If so, how do you access them?

Tom L

PHP Code:
EXPORT mattest()
BEGIN
local a
:=[[[1,2,3],[2,3,4],[19,20,21]],[[4,5,6],[7,8,9],[-1,-2,-3]],[[10,11,12],[13,14,15],[-5,-6,-7]]];
print(
a(2,1,1));
END

Tom L

My father was a man of the cloth. He was a tailor.
Find all posts by this user
Quote this message in a reply
04-12-2017, 06:31 PM
Post: #2
RE: Multi-Dimensional Matrices
The hp-prime supports only up to 2D,

In a next firmware the compiler should detect the validity of an array (maximum 2D)

You can work with n-dimensional arrays as a list

PHP Code:
EXPORT mattest()
BEGIN
    L1
:= { {{1,2,3},{2,3,4},{19,20,21}}, {{4,5,6},{7,8,9},{-1,-2,-3}}, {{10,11,12},{13,14,15},{-5,-6,-7}}};
    print(
L1(2,1,3)); // 6
END
Find all posts by this user
Quote this message in a reply
04-12-2017, 06:42 PM
Post: #3
RE: Multi-Dimensional Matrices
You can either use lists for non-CAS programs, or you can create a CAS program that will do what you want if you specifically want to use the [ ] delimiters for your data.

Graph 3D | QPI | SolveSys
Find all posts by this user
Quote this message in a reply
04-12-2017, 06:43 PM (This post was last modified: 04-12-2017 06:47 PM by toml_12953.)
Post: #4
RE: Multi-Dimensional Matrices
(04-12-2017 06:31 PM)compsystems Wrote:  The hp-prime supports only up to 2D,

In a next firmware the compiler should detect the validity of an array (maximum 2D)

You can work with n-dimensional arrays as a list

PHP Code:
EXPORT mattest()
BEGIN
    L1
:= { {{1,2,3},{2,3,4},{19,20,21}}, {{4,5,6},{7,8,9},{-1,-2,-3}}, {{10,11,12},{13,14,15},{-5,-6,-7}}};
    print(
L1(2,1,3)); // 6
END

Thanks! Now if only MAKELIST was extended to create multi-dimensional lists, it'd be great! Creating a 20x10x30 list will be a challenge the way it is now.

Tom L

Tom L

My father was a man of the cloth. He was a tailor.
Find all posts by this user
Quote this message in a reply
04-12-2017, 06:45 PM
Post: #5
RE: Multi-Dimensional Matrices
(04-12-2017 06:43 PM)toml_12953 Wrote:  Thanks! Now if only MAKELIST was extended to create multi-dimensional lists, it'd be great!

Tom L

Create a program that outputs the desired contents of a list, and have MAKELIST call that program.

Graph 3D | QPI | SolveSys
Find all posts by this user
Quote this message in a reply
08-31-2017, 04:44 AM
Post: #6
RE: Multi-Dimensional Matrices
I'm surprised it's limited at 2D. Tensor analysis is used in a lot of engineering applications (especially mechanical engineering)....so being able to get the inverse, multiplication, etc, etc...of multidimensional arrays shouldn't be that difficult to add to the firmware...
Find all posts by this user
Quote this message in a reply
08-31-2017, 05:22 AM
Post: #7
RE: Multi-Dimensional Matrices
Actually, I take that back....multidimensional array operations can get very complex and are dependent on what you want to do. Classical matrix algebra doesn't go beyond 2D anyways.
Find all posts by this user
Quote this message in a reply
Post Reply 




User(s) browsing this thread: 1 Guest(s)