Campbell-scientific CR9000X Measurement and Control System Instrukcja Użytkownika Pobierz pdf (Strona 297)

Section 8. Processing and Math Instructions

Remarks

Source can be any valid numeric expression measured in radians.

The COS function takes an angle and returns the ratio of two sides of a right

triangle. The ratio is the length of the side adjacent to the angle divided by the

length of the hypotenuse. The result lies in the range -1 to 1.

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. π is approximately 3.141593.

COS Function Example: The example uses COS to calculate the cosine of an angle

with a user-specified number of degrees.

Dim Degrees, Pi, Radians, Ans 'Declare variables.

BeginProg

Pi = 4 * Atn(1) 'Calculate π.

Degrees = Volts(1) 'Get value to convert.

Radians = Degrees * (Pi / 180) 'Convert to radians.

Ans = COS(Radians) ‘The Cosine of Degrees.

EndProg

CosH (Source)

The COSH function returns the hyperbolic cosine of an expression or value.

Syntax

return = COSH (X)

Remarks

The COSH function takes a value and returns the hyperbolic cosine [COSH(x)

= 0.5(e

+ e

-x

)] for that value.

COSH Function Example

The example uses COSH to calculate the hyperbolic cosine of a voltage input

and store the result in the Ans variable.

Public Volt1, Ans 'Declare variables.

BeginProg

Scan (1,Sec,3,0)

VoltDiff (Volt1,1,mV5000,1,True ,200,500,1.0,0)

Ans = COSH( Volt1 )

NextScan

EndProg

CovSpa(Dest,NumofCov, Size,CoreArray,DataArray)

The CovSpa instruction computes the covariance(s) of sets of data that are

loaded into arrays.

Syntax

CovSpa(Dest, NumOfCov, SizeOfSets, CoreArray, DataArray)

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