Campbell-scientific CR9000X Measurement and Control System Manual de usuario descargar pdf (Pagina 291)

Section 8. Processing and Math Instructions

Both have the same effect, X will be set to –1 if Temp(1) is greater than 50 and

Temp(3) is less than 20. X will be set to 0 if either expression is false.

ASIN (Source)

The ASIN function returns the arc sin of a number.

Syntax

x = ASIN (source)

Remarks

Source can be any valid numeric expression that has a value between -1 and 1

inclusive.

The ASIN function takes the ratio of two sides of a right triangle and returns the

corresponding angle. The ratio is the length of the side opposite to the angle

divided by the length of the hypotenuse. The result is expressed in radians and

is in the range -

π/2 to π/2 radians. If it is desired to use degrees instead of

radians for the inputs and results of the trig functions in a program, the

"AngleDegrees" declaration instruction can be used.

To convert degrees to radians, multiply degrees by

π/180. To convert radians to

degrees, multiply radians by 180/

π.

ASIN is the inverse trigonometric function of Sin, which takes an angle as its

argument and returns the length ratio of the side opposite the angle to the

hypotenuse.

ASIN Function Example

The example uses ASIN to calculate π. By definition, a full circle is 2

π radians.

ASIN(1) is

π/2 radians (90 degrees).

Public Pi 'Declare variables.

Pi = 2 * ASIN( 1 ) 'Calculate Pi.

ATN(Source)

Returns the arctangent of a number.

Syntax

Atn(source)

Remarks

The argument source can be any valid numeric expression.

The ATN function takes the ratio (source) of two sides of a right triangle and returns

the corresponding angle. The ratio is the length of the side opposite the angle

divided by the length of the side adjacent to the angle. The result is expressed in

radians and is in the range -

π/2 to π/2 radians. π is approximately 3.141593.

If it is desired to use degrees instead of radians for the inputs and results of the

trig functions in a program, the "AngleDegrees" declaration instruction can be

used.

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