Remote-processing BASIC for the CX-10 Modbus Instrukcja Użytkownika Pobierz pdf (Strona 12)

BASIC PROGRAMMING GUIDE

2-3

ATN

Syntax: ATN(

expr

)

Where:

expr

= value between 0 and PI/2

Function: Returns a trigonometric arc-tangent of

expr

. Returned result is between -PI/2 and PI/2 radians.

Mode: Command, run

Use: PRINT 4*ATN(1)

DESCRIPTION

SIN, COS, and TAN operators use a Taylor series to calculate the function. These operators first reduce the

argument to a value that is between 0 and PI/2. The algorithm used to reduce the value will reduce accuracy

when

expr

is large. To maintain accuracy, keep the arguments for trig functions as small as possible.

ERRORS

ARITH. UNDERFLOW

expr

or result is less than BASIC-52's smallest floating-point value of ±1E-127

ARITH. OVERFLOW

expr

or result is greater than BASIC-52's largest floating-point value of

±.9999999E+127

DIVIDE BY ZERO Attempt to take TAN(X) when COS(PI/2) = 0

EXAMPLES

100 PRINT SIN(PI/2),COS(10001*PI),TAN(5*PI/4)

110 PRINT ATN(TAN(PI/4))/PI

>run

1 -1 1

.24999996

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 83 84

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Remote-processing BASIC for the CX-10 Modbus Instrukcja Użytkownika Strona 12