Texas Instruments TI-Nspire - Libraries

46 TI-Nspire™ Reference Guide
If BooleanExpr1 Then
Block1
ElseIf
BooleanExpr2 Then
Block2
©
ElseIf
BooleanExprN Then
BlockN
EndIf
Allows for branching. If BooleanExpr1 evaluates to true, executes
Block1. If BooleanExpr1 evaluates to false, evaluates
BooleanExpr2, and so on.
ifFn()
Catalog
>
ifFn(BooleanExpr,Value_If_true [,Value_If_false
[,
Value_If_unknown]]) ⇒ expression, list, or matrix
Evaluates the boolean expression BooleanExpr (or each element
from BooleanExpr ) and produces a result based on the following
rules:
• BooleanExpr can test a single value, a list, or a matrix.
• If an element of BooleanExpr evaluates to true, returns the
corresponding element from Value_If_true.
• If an element of BooleanExpr evaluates to false, returns the
corresponding element from Value_If_false. If you omit
Value_If_false, returns undef.
• If an element of BooleanExpr is neither true nor false, returns
the corresponding element Value_If_unknown. If you omit
Value_If_unknown, returns undef.
• If the second, third, or fourth argument of the ifFn() function is a
single expression, the Boolean test is applied to every position in
BooleanExpr.
Note: If the simplified BooleanExpr statement involves a list or
matrix, all other list or matrix arguments must have the same
dimension(s), and the result will have the same dimension(s).
Test value of 1 is less than 2.5, so its corresponding
Value_If_True element of 5 is copied to the result list.
Test value of 2 is less than 2.5, so its corresponding
Value_If_True element of 6 is copied to the result list.
Test value of 3 is not less than 2.5, so its corresponding
Value_If_False element of 10 is copied to the result list.
Value_If_true is a single value and corresponds to any selected
position.
Value_If_false is not specified. Undef is used.
One element selected from Value_If_true. One element
selected from Value_If_unknown.
imag()
Catalog
>
imag(Va lu e 1) ⇒ value
Returns the imaginary part of the argument.
imag(List1) ⇒ list
Returns a list of the imaginary parts of the elements.
If
Catalog
>