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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.

Catalog