A collection of arithmetic functions and operations, which other Watch Face Format elements use to resolve realtime attribute values and gyroscopic effects.
Introduced in Wear OS 4.
Example
An example expression for rotating a value up to 5 degrees in either direction, based on the $ x $value of the Wear OS device's accelerometer:
(5/90)*clamp([ACCELEROMETER_ANGLE_X],0,90) + (5/90)*clamp([ACCELEROMETER_ANGLE_X],90,0)
...which is equivalent to the following mathematical expression, where $ \theta_x $ represents the accelerometer angle in the $ x $direction:
Functions
The Watch Face Format recognizes the following string values as functions:
Function  Description  Return type  Availability 

round() 
Converts the input value to a floatingpoint value, then performs the standard
round() mathematical operation.

Integer  Version 1 
floor() 
Performs the standard floor() mathematical operation.

Float  Version 1 
ceil() 
Performs the standard ceil() mathematical operation.

Float  Version 1 
fract() 
Returns the fractional part of the input value; that is, the part of the floatingpoint value that appears to the right of the decimal point.  Float  Version 1 
sin() 
Performs the standard sin() trigonometric operation.

Float  Version 1 
cos() 
Performs the standard cos() trigonometric operation.

Float  Version 1 
tan() 
Performs the standard tan() trigonometric operation.

Float  Version 1 
asin() 
Performs the standard asin() trigonometric operation. The returned
value is always in the range $ [\frac{\pi}{2}, \frac{\pi}{2}] $.

Float  Version 1 
acos() 
Performs the standard acos() trigonometric operation. The returned
value is always in the range $ [0.0, \pi] $.

Float  Version 1 
atan() 
Performs the standard atan() trigonometric operation. The returned
value is always in the range $ [\frac{\pi}{2}, \frac{\pi}{2}] $.

Float  Version 1 
abs() 
Converts the input value to a floatingpoint value, then performs the standard
abs() mathematical operation.

Float  Version 1 
clamp(,,) 
Converts the input values to floatingpoint values, then performs the
clamp() Jetpack operation to fit the first value in the range defined by
the second and third values.

Float  Version 1 
rand(,) 
Generates a random floatingpoint value that fulfills the following conditions
at the same time:

Float  Version 1 
log() 
Performs the standard base$ e $ log() mathematical operation.

Float  Version 1 
log2() 
Simulates a base2 logarithm. This value is calculated by dividing the base10
log() of the input value) by the base10 logarithm of $ 2 $.

Float  Version 1 
log10() 
Performs the standard base10 log() mathematical operation.

Float  Version 1 
sqrt() 
Performs the standard sqrt() mathematical operation.

Float  Version 1 
cbrt() 
Performs the standard cbrt() mathematical operation.

Float  Version 1 
exp() 
Performs the standard exp() mathematical operation.

Float  Version 1 
expm1() 
Directly calls the expm1() mathematical operation if the input value
is $ 1 $. For any other input value, simulates the function by performing the
standard exp() mathematical operation, then subtracting 1.

Float  Version 1 
deg() 
Performs the standard toDegrees() mathematical operation.
$ \frac{\pi}{2} $ is defined as 90 degrees, and $ \pi $ is defined as 180
degrees.

Float  Version 1 
rad() 
Performs the standard toRadians() mathematical operation. 90 degrees
is defined as $ \frac{\pi}{2} $, and 180 degrees is defined as $ \pi $.

Float  Version 1 
pow(,) 
Performs the standard pow() mathematical operation. The output value
is always a floatingpoint number.

Float  Version 1 
numberFormat(,) 
Applies the number format in the first value to the second value. The first value can contain the following characters:

String  Version 1 
icuText() 
Converts the input date format string to a pattern that matches the expected locale format. If the parent For example, if the device is being used in the United States, an input value
of 
String  Version 1 
icuText(,) 
Converts the first argument input date format string to a pattern that matches the expected locale format. The second argument is a timestamp string in milliseconds. If the parent 
String  Version 2 
icuBestText() 
Converts the input date format string to the current time whose pattern matches the expected format. If the parent For example, if the device is being used in the United States on March 14, 2023
at 1:59 PM, an input value of 
String  Version 1 
icuBestText(,) 
Converts the first argument input date format string to the current time whose pattern matches the expected format. The second argument is a timestamp string in milliseconds. If the parent 
String  Version 2 
subText(,,) 
Extracts a substring from the first value. The second value indicates the 0based index into the first value where the substring should begin. The third value indicates the 0based index into the first value where substring extraction should stop ("from the second value up to, but not including, the third value"). Examples:

String  Version 1 
textLength() 
Calculates the length of the input string. Examples:

String  Version 1 
Operators
The Watch Face Format recognizes the following string values as operators:
+
 Unary plus, or addition of multiple values. Supports both integers and floatingpoint values.

 Unary minus, or subtraction of multiple values. Supports both integers and floatingpoint values.
*
 Multiplication of multiple integer or floatingpoint values.
/
Division of 2 integer or floatingpoint values.
If division of 2 integers results in a noninteger value, the decimal part is preserved in the floatingpoint result. For example, $ \frac{1}{2} = 0.5 $.
In addition, the expression $ \frac{x}{0} $ is evaluated as
0
, where $ x $ is any integer.%
Modular division of 2 integer or floatingpoint values.
If both operands are integers, the result is the remainder from dividing the 2 values. For example, $ 19 \bmod 7 = 5 $.
If at least one operand is a floatingpoint number, the result is a floatingpoint equivalent of the remainder; for example: $ 19.0 \bmod 7 = 5.0 $.
~
Bitwise "not" operator. Several examples:
~1
is $ 2 $~0
is $ 1 $
!
Logical "not" operator, which supports double negatives. Several examples:
 $ !2 $ is
false
 $ !!0 $ is
true

Bitwise "or" operator. Supports more than 2 input values. Several examples:
 $ 1  0 = 1 $
 $ 1  2  4 = 7 $

 Logical "or" operator.
&
 Bitwise "and" operator. Supports exactly 2 input values.
&&
 Logical "and" operator.
(
 Open parenthesis. Used for changing the standard order of operations, where multiplication and division ordinarily take priority over addition and subtraction.
)
 Closed parenthesis. Used for changing the standard order of operations, where multiplication and division ordinarily take priority over addition and subtraction.
<
 The "less than" comparison operator. When comparing an integer value with its
floatingpoint equivalent, the result is
false
. <=
 The "less than or equal to" comparison operator. When comparing an integer
value with its floatingpoint equivalent, the result is
true
. >
 The "greater than" comparison operator. When comparing an integer value with
its floatingpoint equivalent, the result is
false
. >=
 The "greater than or equal to" comparison operator. When comparing an integer
value with its floatingpoint equivalent, the result is
true
. ?
and:
Provides support for ternary operations. The general format is as follows:
condition ? value_if_true : value_if_false
Supports nested ternary operations using parentheses.
,
Separates values in functions that take more than 1 argument.
"
When placed at the beginning and end of a value, indicates that the Watch Face Format should interpret the value as a string.
==
Compare for equality. When comparing an integer value with its floatingpoint equivalent, the result is
true
.!=
Compare for inequality. When comparing an integer value with its floatingpoint equivalent, the result is
false
.
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