Texas Instruments TI86 User Manual - Page 303

Chapter 20: A to Z Function and Instruction Reference 291 Equal to: == TEST menu The == operator is used to compare arguments, while = is used to assign a value or expression to a variable. numberA == numberB matrixA == matrixB vectorA == vectorB stringA == stringB Tests whether the condition argumentA == argumentB is true or false. Numbers, matrices, and vectors can be real or complex. If complex, the magnitude (modulus) of each element is compared. Strings are case-sensitive. • If true (argumentA = argumentB), returns 1. • If false (argumentA ƒ argumentB), returns 0. listA == listB Returns a list of 1s and/or 0s to indicate if each element in listA is = the corresponding element in listB. Euler † graph format screen (scroll down to second screen) Euler In DifEq graphing mode, uses an algorithm based on the Euler method to solve differential equations. Typically, Euler is less accurate than RK but finds the solutions much quicker. eval MATH MISC menu eval xValue Returns a list containing the y values of all defined and selected functions evaluated at a real xValue. 2+2==2+2 b 1 2+(2==2)+2 b 5 [1,2]==[3N2,L1+3] b 1 "A"=="a" b 0 {1,5,9}=={1,L6,9} b {1 0 1} Remember that built-in equation variables y1 and y2 are case-sensitive: y1=x^3+x+5 b y2=2 x b eval 5 b Done Done {135 10}