Texas Instruments TI-89 User Manual - Page 831

imag(matrix1) ⇒ matrix Returns a matrix of the imaginary parts of the elements. imag([a,b;ic,id]) ¸ ImpDif() MATH/Calculus Menu, CATALOG ImpDif(equation, independentVar, dependentVar[,order ]) ⇒ expression where the order defaults to 1. Computes the implicit derivative for equations in which one variable is defined implicitly in terms of another. impDif(x^2+y^2=100,x,y)¸ [0c 0d] -x/y Indirection See #(), page 908. Input CATALOG Input Pauses the program, displays the current Graph screen, and lets you update variables xc and yc (also rc and qc for polar coordinate mode) by positioning the graph cursor. When you press ¸, the program resumes. Input [promptString,] var Input [promptString], var pauses the program, displays promptString on the Program I/O screen, waits for you to enter an expression, and stores the expression in variable var. If you omit promptString, "?" is displayed as a prompt. InputStr CATALOG InputStr [promptString,] var Pauses the program, displays promptString on the Program I/O screen, waits for you to enter a response, and stores your response as a string in variable var. If you omit promptString, "?" is displayed as a prompt. Note: The difference between Input and InputStr is that InputStr always stores the result as a string so that " " are not required. Program segment: © :¦ Get 10 points from the Graph Screen :For i,1,10 : Input : xc! XLIST[i] : yc! YLIST[i] :EndFor © Program segment: © :For i,1,9,1 : "Enter x" & string(i)! str1 : Input str1,#(right(str1,2)) :EndFor © Program segment: © :InputStr "Enter Your Name",str1 © Appendix A: Functions and Instructions 831