Page tree

You are viewing an old version of this page. View the current version.

Version 25

Trifacta Dataprep

Contents:

For input values between -1 and 1 inclusive, this function returns the angle in radians whose sine value is the input. This function is the inverse of the sine function. The value can be a Decimal or Integer literal or a reference to a column containing numeric values.

NOTE: While this function returns values outside of the range -1 <= x <= 1, those values are not considered valid.

Arc cosecant:

The arc secant function is computed as follows:

Input RangeOutput computation
x<=-1asin(1/x)
x>=1asin(1/x)
-1<x<1Not valid

Wrangle vs. SQL: This function is part of Wrangle , a proprietary data transformation language. Wrangle is not SQL. For more information, see Wrangle Language.

Basic Usage

Numeric literal example:

asin(0.5)

Output: Returns the computation of the arc sine of 0.5. Output value is in radians.

Column reference example:

asin(X)

Output: Returns the arc sine of the values in X column.

Syntax and Arguments

asin(numeric_value)

ArgumentRequired?Data TypeDescription
numeric_valueYstring, decimal, or integerName of column, Decimal or Integer literal, or function returning those types to apply to the function

numeric_value

Name of the column, Integer or Decimal literal, or function returning that data type to apply to the function.

• Missing input values generate missing results.
• Literal numeric values should not be quoted. Quoted values are treated as strings.
• Multiple columns and wildcards are not supported.

Usage Notes:

Required?Data TypeExample Value
YesString (column reference) or Integer or Decimal literal10

Examples

Example - Trigonometry Arc functions

This example illustrates how to apply the inverse trigonometric (Arc) functions to your transformations.

Functions:

NOTE: These functions are valid over specific ranges.

• ASIN. Arcsine
• ACOS. Arccosine
• ATAN. Arctangent

The following functions are computed using the above functions.

• Arccotangent. Computed using ATAN function. See below.
• Arcsecant. Computed using ACOS function. See below.
• Arccosecant. Computed using ASIN function. See below.

Source:

In the following sample, input values are in radians. In this example, all values are rounded to two decimals for clarity.

Y
-1.00
-0.75
-0.50
0.00
0.50
0.75
1.00

Transformation:

Arcsine:

Valid over the range (-1 <= Y <= 1)

Transformation Name New formula Single row formula round(degrees(asin(Y)), 2) 'asinY'

Arccosine:

Valid over the range (-1 <= Y <= 1)

Transformation Name New formula Single row formula round(degrees(acos(Y)), 2) 'acosY'

Arctangent:

Valid over the range (-1 <= Y <= 1)

Transformation Name New formula Single row formula round(degrees(atan(Y)), 2) 'atanY'

Arccosecant:

This function is valid over a set of ranged inputs, so you can use a conditional column for the computation. For more information, see ASIN Function.

Transformation Name Conditional column if...then...else (Y <= -1) || (Y >= 1) round(degrees(asin(divide(1, Y))), 2) 'acscY'

Arcsecant:

Same set of ranged inputs apply to this function. For more information, see ACOS Function.

Transformation Name Conditional column if...then...else (Y <= -1) || (Y >= 1) round(degrees(acos(divide(1, Y))), 2) 'asecY'

Arccotangent:

For this function, the two different ranges of inputs have different computations, so an else condition is added to the transformation. For more information, see ATAN Function.

Transformation Name Conditional column if...then...else Y > 0 round(degrees(atan(divide(1, Y))), 2) round(degrees(atan(divide(1, Y)) + pi()), 2) 'acotY'

Results:

YacotYasecYacscYatanYacosYasinY
-1.00-41.86180.00-90.00-45.00180.00-90.00
-0.75-49.99nullnull-37.00139.00-49.00
-0.50-60.29nullnull-27.00120.00-30.00
0.00nullnullnull0.0090.000.00
0.5063.44nullnull27.0060.0030.00
0.7553.13nullnull37.0041.0049.00
1.0045.000.0090.0045.000.0090.00

• Page:
• Page:
• Page:

• Page:
• Page:
• Page:
• Page:
• Page:
• Page:
• Page:
• Page:
• Page:
• Page:

• No labels