TRIG

Performs a trigonometric transformation on a NDF

Description:

This routine copies the supplied input NDF , performing a specified trigonometric operation (sine, tangent, etc.) on each value in the DATA array. The VARIANCE  component, if present, is modified appropriately. Pixels for which the required value is undefined, or outside the numerical range of the NDFs data type, are set bad in the output.

Usage:

trig in trigfunc out title

Parameters:

IN = NDF (Read)
The input NDF structure.
OUT = NDF (Write)
The output NDF structure.
TRIGFUNC = LITERAL (Read)
Trigonometrical function to be applied. The options are as follows.

  • "ACOS" –- arc-cosine (radians)

  • "ACOSD" –- arc-cosine (degrees)

  • "ASIN" –- arc-sine (radians)

  • "ASIND" –- arc-sine (degrees)

  • "ATAN" –- arc-tangent (radians)

  • "ATAND" –- arc-tangent (degrees)

  • "COS" –- cosine (radians)

  • "COSD" –- cosine (degrees)

  • "SIN" –- sine (radians)

  • "SIND" –- sine (degrees)

  • "TAN" –- tangent (radians)

  • "TAND" –- tangent (degrees)

TITLE = LITERAL (Read)
A title for the output NDF. A null value will cause the title of the NDF supplied for Parameter IN to be used instead. [!]

Examples:

trig sindata asind data
Take the arc-sine of the data values in the NDF called sindata, and store the results (in degrees) in the NDF called data.
trig sindata asin data
As above, but the output values are stored in radians.

Related Applications

KAPPA: ADD, CADD, CMULT, CDIV, CSUB, DIV, MATHS, MULT, SUB.

Implementation Status: