Campbell CR5000 Especificações descarregar pdf (Página 174)

Section 8. Processing and Math Instructions

8-2

ACOS (Source)

The ACOS function returns the arc cosine of a number.

Syntax

x = ACOS (source)

Remarks

The source can be any valid numeric expression that has a value between -1

and 1 inclusive.

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

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

To convert degrees to radians, multiply degrees by π/180. To convert radians

to degrees, multiply radians by 180/π.

ACOS is the inverse trigonometric function of COSINE, which takes an angle

as its argument and returns the length ratio of the side adjacent to the angle to

the hypotenuse.

ACOS Function Example

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

radians. ACOS(0) is π/2 radians (90 degrees).

Public Pi 'Declare variables.

Pi = 2 * ACOS( 0 ) 'Calculate Pi.

AND

Used to perform a logical conjunction on two expressions.

Syntax

result = expr1 And expr2

Remarks

If, and only if, both expressions evaluate True, result is True. If either

expression evaluates False, result is False. The following table illustrates how

result is determined:

If expr1 And expr2 The result

is is is

True True True

True False False

False True False

False False False

The And operator also performs a bit-wise comparison of identically

positioned bits in two numeric expressions and sets the corresponding bit in

result according to the following truth table:

1 2 ... 169 170 171 172 173 174 175 176 177 178 179 ... 237 238

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Campbell CR5000 Especificações Página 174