Texas Instruments TI-99/4A - Page 112

ABS - Absolute Value
ABS(numeric'expression)
The absolute value function gives you the dL~ulule value uf the
argument.
The argument is the value obtained when the numeric·
expression is evaluated. The normal rules for evaluating numeric
expressions (see "N UlUel ic Expressions") are used here. If the
argument is positive. then the absolute value function gives you
the
argument itself. If the argument is negative, the absolute
value function ~iv~ yuu the negative of the argument. Thus, for
an
argument, X:
_If X .2:0, ABS(X) =X
_If X <0, ABS(X) =-X
(e.g., ABS(-3) =-(-3)=3)
ATN - Arctangent
ATN (numeric'expression)
The arctangent function gives you the arctangent of the argument.
The argument i~ the value obtained when the numeric-expression is
evaluated. The normal rules for evaluating numeric expressions
are used here. Thus, ATN(x) gives you the angle (in radians)
whose tangent is x. If you want to get the equivalent angle ill
degrees, you need to multiply the answer you get by (1801
4*ATN(I))) or 57.295779513079 which is ISO!?r. The value
given for the arctangent function is always ill the range - 17/
2<ATN(x)<'7T/2.
11-92
Examples:
>N EW
>100 A=-27.36
>110 8=9_7
>120 PRINT ABSCA);ABSCB)
>130
PRINT ABSC3.8);ABS(-4.5)
>140 PRINT ABSC-3*2)
>150 PRINT ABSCA*(B-3.2»
>160 END
>RUN
27.36 9.7
3.8 4.5
6
177.84
** DONE **
>NEW
>100 PRINT ATNC.44)
>110 PRINT ATN(1E127)
>120 PRINT ATNC1E-129);ATNCO)
>130
PRINT ATNC.3)*57.2957795
13079
>140 PRINT ATN(.3)*C180/(4*AT
N(1»)
>150 END
>RUN
.4145068746
1.570796327
o 0
16.69924423
16.69924423
** DONE **
User's Reference Guide