![]() ![]() Also, using one index - matrix - returns the r th row of the matrix as a 1 by # matrix. You can access a certain element of the matrix by writing the coordinates of the element you want in brackets after it: matrix would access the element in the r th ROW and the c th COLUMN of the matrix (Matrices are always indexed first by the row, top to bottom, and second by the column, left to right). Using (this works because matrices are actually stored as lists of lists).] (this is a matrix with 2 rows - the row a,b,c above the row d,e,f). There are three ways to enter a matrix on the calculator: ![]() You can even mix and match variable types - it's perfectly all right to have a string in one element, and a number in the next. On the TI-68k calculators, matrices can contain any mix of any scalar (non-list) variable type that's valid in an expression: you can have matrices of numbers, matrices of strings, matrices of truth values or expressions. A matrix is a rectangular grid of elements.
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