Multi-Dimensional Matrices

[toml_12953]

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; 


[compsystems]

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; 


[Han]

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.

[toml_12953]

(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

[Han]

(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.

[webmasterpdx]

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...

[webmasterpdx]

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.