MaplePrimes - answers and comments on Question, Defining variables using matrix entries

Sorry, little typo, i goes

pirolafire — Sun, 14 Feb 2010 09:29:38 Z

Sorry, little typo, i goes from i to 200

Matrix

Robert Israel — Sun, 14 Feb 2010 12:20:25 Z

It's a really bad idea to use Matrix as the name of your Matrix. The name Matrix is protected in order to prevent this. Maple needs to use this name for its Matrix type.

Hello, its not really Matrix

pirolafire — Sun, 14 Feb 2010 17:28:24 Z

Hello, its not really Matrix i just made up a name. The real name of the matrix is Divisions. Anyway how would I define ΔX_ito be the ith entry in the single column "Divisions" matrix? Thank you

Vector version

gkokovidis — Sun, 14 Feb 2010 19:20:40 Z

Here is one way. I built an equation with 5 entries to demonstrate. If this works for you, then make the appropriate modifications.

restart:

eq:=DeltaX[i];

eq2:=[seq( eq, i=1..5 )];

Divisions:=Vector(5,eq2);

Regards,
Georgios Kokovidis

Dräger Medical

Hello, thank you for your

pirolafire — Sun, 14 Feb 2010 21:22:12 Z

Hello, thank you for your answer. Sorry I was not being clear. I have real world data I want to assign to a matrix. For example:

Divsions is a matrix (or a vector.. whichever works best)

| 29328 |
| 4328    |
| 4489     |
| 2138    |
| 48934   |

I want maple to know that ΔX1 is 29328, ΔX2 is 4328, and so on.

Any way to do that?

Thank you

Assignment of values

gkokovidis — Sun, 14 Feb 2010 22:14:14 Z

So, for example, if vector A is defined as below (your version of vector A would have 200 entries in it, i.e your real world data), then you can assign your DeltaX's to each of the elements of A. Is that accurate?

Adding to the previous example:

A:=Vector([29328,4328,4489,2138,48934]);

seq(DeltaX[j]=A[j],j=1..5);

or you can do it manually, for each value if you choose.

DeltaX[4]=A[4];

and so on.

Regards,
Georgios Kokovidis

Dräger Medical