Remote-processing BASIC 52 Instrukcja Użytkownika Pobierz pdf (Strona 130)

RPBASIC-52 PROGRAMMING GUIDE

2-111

TAN

Syntax: TAN(expr)

Function: Returns the trigonometric tan gent (sin/cos) of expr which is assu med to be in radian s. expr must be

in the range of +/- 200,000.

Mode: Command, run

Use: PRINT TAN(PI/4)

Cards: All

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

ERRORS

ARITH. UNDERFLOW value or result is less than RPBASIC-52's smallest floating-point value of ± 1E-127

ARITH. OVERFLOW value or result is greater than RPBASIC-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 ... 125 126 127 128 129 130 131 132 133 134 135 ... 162 163

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