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Basic operations with matrix in a program ...
05-29-2020, 05:11 PM
Post: #1
Basic operations with matrix in a program ...
How can you get the average or quartile1 or covariance of a matrix in a program?

Hp Prime can get special functions like eigenvalues of any matrix in a program, but simple stat commands gives a "undef" message ...

EXPORT Destats()
BEGIN
LOCAL mat, res;
res:=[[1],[1]];
IF M0=[[0]] THEN
mat:=EDITMAT(M0);
//RETURN M0;
ELSE
INPUT({{M0,[4]}},"Matrix");
mat:=M0;
//RETURN mat;
END;
res(1,1):=23;
res(2,1):=quartile1(mat);
EDITMAT(res);
END;

Jesús Tamez
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05-29-2020, 06:02 PM
Post: #2
RE: Basic operations with matrix in a program ...
These are CAS commands, you can execute them in PPL three ways, as far as I know.

1. Use a "CAS." prefix. Ex.: CAS.covariance();

2. Execute the comand as a string with CAS("");

3. Make your program a CAS function by checking the box when creating it, this will automatically add #cas and #end to it.
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05-29-2020, 07:46 PM (This post was last modified: 05-29-2020 08:36 PM by StephenG1CMZ.)
Post: #3
RE: Basic operations with matrix in a program ...
If the built-ins don't help, you might find some of the Basic Linear Algebra Subprograms (BLAS Level 1) useful.

https://www.hpmuseum.org/forum/thread-13613.html

Stephen Lewkowicz (G1CMZ)
ANDROID HP Prime App broken offline on some mobiles
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