Texas Instruments TI-86 - Manual (Page 303)

Chapter 20: A to Z Function and Instruction Reference
291
20ATOZ.DOC TI-86, Chap 20, US English Bob Fedorisko Revised: 02/13/01 2:42 PM Printed: 02/13/01 3:05 PM Page 291 of 118 20ATOZ.DOC TI-86, Chap 20, US English Bob Fedorisko Revised: 02/13/01 2:42 PM Printed: 02/13/01 3:05 PM Page 291 of 118
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 .
2+2==2+2 b 1
2+(2==2)+2 b 5
[1,2]==[3 N 2, L 1+3] b 1
"A"=="a" b 0
listA == listB
Returns a list of 1 s and/or 0 s to indicate if each element
in listA is = the corresponding element in listB.
{1,5,9}=={1, L 6,9} b {1 0 1}
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.
Remember that built-in equation variables y1
and y2 are case-sensitive:
y1=x^3+x+5 b Done
y2=2 x b Done
eval 5 b {135 10}