[ti basic] matrix manipulation

[Loki]

How do you manipulate and access data in a matrix?

[kalan_vod]

For matrics:

:ClrHome
:[[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1][1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1][1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1][1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1][1,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1][1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1][1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1][1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1[A]
:For(A,1,8
:For(B,1,16
:Output(A,B,sub(" O",[A](A,B)+1,1
:End
:End
:2A:2B
:[A](A,B
:Repeat Ans=1
:Repeat Ans
:getKey
:End
:AC:BD
:B+(=26)-(=24B
:A+(=34)-(=25A
:If [A](A,B:Then
:CA:DB:End
:Output(C,D,"
:Output(A,B,"O

So you just want to change a number, then just [A](A,B
such as I want a 3 to be in the 1,1 position then I would 3->[A](1,1

[CompWiz]

There's a whole section in the manual about it. If you don't have a manual(or have the mini 84 series manual), here is the 83+/SE manual, and here is the complete 84+/SE manual. Chapter 10 deals with matrixes.

[Loki]

Aha, I got it now. Thanks! Never used matrices before, so...

[Liazon]

Aha, I got it now. Thanks! Never used matrices before, so...

You mean you've never used them in programming right? Because matrices have mathematical uses, or so they say...

[Loki]

Never used them period. Never really felt the need to...still dont, but i figured i'd learn now so i'll know when the time comes

[Loki]

Ok, so how exactly would you use them on an 89Ti?

[kalan_vod]

You might want to get help from http://www.unitedti.org, as they have many 68k programmers.

[Loki]

Wow, i thought I was the only one up at 2 30 posting about calc stuff o.o thanks, too

[KermMartian]

Ha! You thought wrong.

[DarkerLine]

Ok, so how exactly would you use them on an 89Ti?

Close to the same deal:

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[[1,2][3,4]]->mat1

another method of storing matrices:

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[1,2;3,4]->mat2

create a 2x3 matrix filled with zeroes:

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newMat(2,3)->mat3

you can use seq( commands to create matrices as well:

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seq(seq(i*j,j,1,2),i,1,2))->mat4

you can mix variable types in matrices:

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["hello",x+1;-5,"world]

get an element of a matrix:

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mat1[1,2]

you store to elements in the same way:

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"matrices are fun"->mat1[1,2]

stick two matrices together side-to-side:

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augment(mat1,mat2)

stick two matrices together top-to-bottom:

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augment(mat1;mat2)

Getting the size of a matrix:

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dim(mat1)

returns a list, in this case {2,2} of the row and column size

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rowDim(mat1)

returns the size of a row

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colDim(mat1)

returns the size of a column

you can't store to dim(), rowDim(), or colDim(). However, you can use augment to increase a matrix's size. To get a submatrix, use:

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subMat(mat1,startRow,StartCol,endRow,endCol)

There are many more functions like these, consult the TI-89 manual available from TI's website and Google.

You might want to get help from http://www.unitedti.org, as they have many 68k programmers.

We do visit maxcoderz occasionally as well.