Remote-processing BASIC for the CX-10 Modbus User Manual download pdf (Page 78)

BASIC PROGRAMMING GUIDE

2-69

TAN

Syntax: TAN(

expr

)

Function: Returns the trigonometric tangent (sin/cos) of

expr

which is assumed to be in radians.

expr

must be

in the range of +/- 200,000.

Mode: Command, run

Use: PRINT TAN(PI/4)

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 BASIC-52's smallest floating-point value of ± 1E-127

ARITH. OVERFLOW

value

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 ... 73 74 75 76 77 78 79 80 81 82 83 84

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Remote-processing BASIC for the CX-10 Modbus User Manual Page 78