2-8-32

Using the Action Menu

ufill

Function: Creates a matrix with a specific number of rows and columns, or replaces the elements of a matrix with a specific expression.

Syntax: fill (Exp, number of rows, number of columns [ ) ] fill (Exp, Mat [ ) ]

Example: To create a 2 ⋅ 3 matrix, all whose elements are 2

Menu Item: [Action][Matrix-Create][fill]

Example: To replace all of the elements of the matrix [[1, 2] [3, 4]] with 3

Menu Item: [Action][Matrix-Create][fill]

usubMat

Function: Extracts a specific section of a matrix into a new matrix.

Syntax: subMat (Mat [,start row] [,start column] [,end row] [,end column] [ ) ]

•“1” is the default when you omit “[, start row]” and “[, start column]”.

•The last row number is the default when you omit “[, end row]”.

•The last column number is the default when you omit “[, end column]”.

Example: To extract the section from row 2, column 2, to row 3, column 3 from the matrix [[1, 4, 7] [2, 5, 8] [3, 6, 9]]

Menu Item: [Action][Matrix-Create][subMat]

udiag

Function: Returns a one-row matrix containing the elements from the main diagonal of a square matrix.

Syntax: diag (Mat[ ) ]

Example: To extract the diagonal elements of the matrix [[1, 2] [3, 4]]

Menu Item: [Action][Matrix-Create][diag]

ulistToMat

•For information about listToMat, see page 2-8-24.

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