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100

101

15-14

ATN (Function) [Conforms to SLIM]

Function

Obtains an arc tangent.

Format

ATN (<Expression>)

Explanation

This statement obtains the arc tangent of the value in <Expression>.

The obtained value is expressed in degrees and ranges from -90 to 90.

If <Expression> includes a double precision real numeral, the obtained value

becomes double precision. Otherwise, a single precision value is obtained.

Explanation: The ATN function receives the ratio of 2 sides of a right

triangle as an argument (number) and returns the

corresponding angle. The 2 sides mentioned here

include the right angle. The ratio of the 2 sides is the

value of the opposite side length to the obtained angle

divided by the adjacent side (base, or side adjacent to

the obtained angle) length. The return value will range

from -π

ππ

π/2 to π

ππ

π/2 (expressed in radians). To convert

degrees to radians, multiply the degree by π

ππ

π/180. To

convert radians to degrees, multiply the radian by 180/π

ππ

π.

Memo: The ATN function is an inverse trigonometric function of

the Tan function. The Tan Function receives an angle as

an argument, and returns the ratio of the 2 sides that

include the right angle of a right triangle. Note the

difference between the ATN function and the cotangent

(1/tangent) of the reciprocal tangent.

Related Terms

SIN, COS, TAN, ASIN, ACOS, ATN2

Example

DEFSNG lf1, lf2, lf3, lf4, lf5, lf6, lf7

lf1 = ATN(0.5) 'Assigns the arc tangent value of 0.5 to lf1.

lf2 = ATN(lf4/2)

'Assigns the arc tangent value of (lf4/2) to lf2

lf3 = ATN(lf5/lf6) * lf7 'Assigns the arc tangent value of (lf5/lf6)

'multiplied by lf7 to lf3.

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Denso RC5 Specifiche Pagina 462

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