Vector Basic Interpreter Basic 80 Reference Manual - page 129
of
190
If X>O, SGN(X) returns 1.
It
X-O, SGN(X) returns O.
It X ON SGN(X)+2 GOTO 100,200,300 branches to 100 if X is negative, 200 if X is 0 and 300 if X is positive. SK, Extended, Disk Returns the sine of X in calculated in COS(X)-S~(X+3.14159/2). PRINT SIN (1.5) .997495 Ok radians. single SIN (X) is precision.