if Reference

Conditional statement in if/then/else form

if

Description

Evaluates input according to a conditional statement specified in an if-then-else form.

Examples

Complex comparisons and results can be described in a single object

Arguments

if [symbol]

The arguments for the if object start with a conditional statement that uses the same syntax as expr. The word then follows the conditional statement, which is then followed by a message expression. After the message expression, there is an optional else and a second message expression.
if evaluates the conditional expression, and if the result is non-zero, evaluates the message expression after the word then. Otherwise, it evaluates the second message expression after the word else if an else message is provided.

then, else [symbol]

Message expressions are similar to what you type into a message box.

$i1, $f1, $s1 [symbol]

You use $i1, $f1, or $s1 instead of $1 for replaceable arguments. The number of inlets is determined by how many different changeable arguments are typed in. The maximum number of inlets is 9.

send [symbol]

No commas or semicolons are allowed. Messages can be sent to remote receive objects by preceding the message expression with send, followed by the name of the receive object.

out2 [symbol]

The keyword out2 in a message expression creates a second, right outlet for the if object. If out2 precedes a message expression, the result of the expression is sent out the right outlet instead of the left outlet.

Attributes

Common Box Attributes

Messages

bang

In left inlet: Evaluates the conditional statement using the values currently stored.

int

Arguments

input [int]
The number in each inlet will be stored in place of the $i or $f argument associated with it, and the expression will be evaluated.

  (inlet1)

Arguments

input [int]
Replace the $i1 value

  (inlet2)

Arguments

input [int]
Replace the $i2 value

  (inlet3)

Arguments

input [int]
Replace the $i3 value

  (inlet4)

Arguments

input [int]
Replace the $i4 value

  (inlet5)

Arguments

input [int]
Replace the $i5 value

  (inlet6)

Arguments

input [int]
Replace the $i6 value

  (inlet7)

Arguments

input [int]
Replace the $i7 value

  (inlet8)

Arguments

input [int]
Replace the $i8 value

  (inlet9)

Arguments

input [int]
Replace the $i9 value

float

Arguments

input [float]
The number in each inlet will be stored in place of the $i or $f argument associated with it, and the expression will be evaluated.

  (inlet1)

Arguments

input [float]
Replace the $f1 value

  (inlet2)

Arguments

input [float]
Replace the $f2 value

  (inlet3)

Arguments

input [float]
Replace the $f3 value

  (inlet4)

Arguments

input [float]
Replace the $f4 value

  (inlet5)

Arguments

input [float]
Replace the $f5 value

  (inlet6)

Arguments

input [float]
Replace the $f6 value

  (inlet7)

Arguments

input [float]
Replace the $f7 value

  (inlet8)

Arguments

input [float]
Replace the $f8 value

  (inlet9)

Arguments

input [float]
Replace the $f9 value

set

Arguments

set-input [list]
The word set, followed by one or more numbers, treats those numbers as if each had come in a different inlet, replacing the stored value with the new value, but the conditional statement is not evaluated and nothing is sent out the outlet. If there are fewer numbers in the message than there are inlets, the stored value in each remaining inlet is left unchanged.

symbol

Arguments

input [symbol]
Symbols can only be received in the first inlet. If received in the first inlet, a symbol will be stored in place of the $s argument associated with it, and the expression will be evaluated, with the exception that you cannot do comparisons or use other operators with symbols. If the symbol shares the name of a table object, you can specify a position in the table to be evaluated.

Output

anything

The message after the then or else portion of the arguments is sent out the outlet. If the word out2 is present as an argument, there will be two outlets, and messages following out2 will be sent out the right outlet. If the word send is present as an argument, the word that follows it is the name of a receive object, and the message that follows it will be sent to receive objects with that name.

See Also

Name Description
!=
<
<=
==
>
>=
expr
select
Max Basic Tutorial 22: Designing Equations Max Basic Tutorial 22: Designing Equations