Texas Instruments TI-89 User Manual - Page 793

ClrGraph CATALOG ClrGraph Clears any functions or expressions that were graphed with the Graph command or were created with the Table command. (See Graph or Table.) Any previously selected Y= functions will be graphed the next time that the graph is displayed. ClrHome CATALOG ClrHome Clears all items stored in the entry() and ans() Home screen history area. Does not clear the current entry line. While viewing the Home screen, you can clear the history area by pressing ƒ and selecting 8:Clear Home. For functions such as solve() that return arbitrary constants or integers (@1, @ 2, etc.), ClrHome resets the suffix to 1. ClrIO CATALOG ClrIO Clears the Program I/O screen. ClrTable CATALOG ClrTable Clears all table values. Applies only to the ASK setting on the Table Setup dialog box. While viewing the Table screen in Ask mode, you can clear the values by pressing ƒ and selecting 8:Clear Table. colDim( ) MATH/Matrix/Dimensions menu colDim(matrix) ⇒ expression colDim([0,1,2;3,4,5]) ¸ 3 Returns the number of columns contained in matrix. Note: See also rowDim(). colNorm( ) MATH/Matrix/Norms menu colNorm(matrix) ⇒ expression Returns the maximum of the sums of the absolute values of the elements in the columns in matrix. Note: Undefined matrix elements are not allowed. See also rowNorm(). [1,ë 2,3;4,5,ë 6]! mat ¸ [14 ë2 5 ë 63] colNorm(mat) ¸ 9 comDenom() MATH/Algebra menu comDenom(expression1[,var]) ⇒ expression comDenom(list1[,var]) ⇒ list comDenom(matrix1[,var]) ⇒ matrix comDenom(expression1) returns a reduced ratio of a fully expanded numerator over a fully expanded denominator. comDenom((y^2+y)/(x+1)^2+y^2+y) ¸ Appendix A: Functions and Instructions 793