## Gauss-Jordan reduction

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**1**of**1**- somebody1234
- Junior Member
**Posts:**1**Joined:**Sun Feb 09, 2014 12:15 am**Calculators:**Casio fx-9860G AU, Casio fx-9860G AU PLUS, Casio Classpad 300, Casio Classpad 330 plus, Casio fx-CG 10, Casio Classpad fx-cp400

### Gauss-Jordan reduction

I'm trying to get a program to do Gauss-Jordan reduction.

1. How do I find the number at a certain location in a matrix?

2. How are row operation commands used?

1. How do I find the number at a certain location in a matrix?

2. How are row operation commands used?

- helder7
- Senior Member
**Posts:**369**Joined:**Tue Jan 03, 2012 11:24 pm**Calculators:**Casio Afx 1.0, Casio fx-9860 GII SD, Casio Classpad 330, Casio fx-CG 20, Casio Classpad fx-cp400

### Re: Gauss-Jordan reduction

Welcome to the forum somebody1234. Thank you for joining us.

If you are working with ClassPad you can store the matrix to a variable name.

In fx9860g and fx-cg the matrix should be saved under matrix memory Mat [A-Z].

Exemple:

To obtain the value of a cell given x and y coordinates (for exemple 1,1), you can do:

The main difference between matrix in classpad and fx9860/fx-cg is the way how the matrix is stored. The operations are similar.

----------------------------

Regarding the second part of your question, the row commands are used in the following way:

Row+

This adds the contents of rowA to rowB, return a Matrix.

*Row+

This adds the contents of rowA to rowB factor times, return a matrix. The end result of B is (factor * A) + B.

*Row

This multiplies the specified row in the matrix by the value, return a matrix.

If you are working with ClassPad you can store the matrix to a variable name.

In fx9860g and fx-cg the matrix should be saved under matrix memory Mat [A-Z].

Exemple:

- Code: Select all
`In fx9860g/fx-cg:`

[[1,2,3],[4,5,6],[7,8,9]]→Mat A

In Classpad:

[[1,2,3],[4,5,6],[7,8,9]]⇒SOMENAME

To obtain the value of a cell given x and y coordinates (for exemple 1,1), you can do:

- Code: Select all
`In fx9860g/fx-cg:`

Mat A[1,1]

In Classpad:

SOMENAME[1,1]

The main difference between matrix in classpad and fx9860/fx-cg is the way how the matrix is stored. The operations are similar.

----------------------------

Regarding the second part of your question, the row commands are used in the following way:

Row+

- Code: Select all
`Row+ Mat [A-Z],rowA,rowB`

This adds the contents of rowA to rowB, return a Matrix.

*Row+

- Code: Select all
`*Row+ Factor,Mat [A-Z],rowA,rowB`

This adds the contents of rowA to rowB factor times, return a matrix. The end result of B is (factor * A) + B.

*Row

- Code: Select all
`*Row value,matrix,row`

This multiplies the specified row in the matrix by the value, return a matrix.

SiO2 + CaCO3 ----------> CaSiO3 + CO2

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