Apple II manual Inverse Hyperbolic Secant, Error Messages, ?XX Error

FUNCTION	FUNCTION EXPRESSED IN TERMS OF BASIC FUNCTIONS
INVERSE HYPERBOLIC
SINE	ARGSINH(X) = LOG(X+SQR(X*X+1))
INVERSE HYPERBOLIC
COSINE	ARGCOSH(X) = LOG(X+SQR(X*X-1))
INVERSE HYPERBOLIC
TANGENT	ARGTANH(X) = LOG((1+X)/(1-X))/2
INVERSE HYPERBOLIC
SECANT	ARGSECH(X) = LOG((XQR(-X*X+1)+1)/X
INVERSE HYPERBOLIC
COSECANT	ARGCSCH(X) = LOG((SGN(X)*SQR(X*X+1)+1)/X)
INVERSE HYPERBOLIC
COTANGENT	ARGCOTH(X) = LOG((X+1)/(X-1))/2
A ERROR MESSAGES

If an error occurs, BASIC outputs an error message, returns to command level and displays the cursor. Variable values and the program text remain intact, but the program can not be continued and all GOSUB and FOR context is lost.

When an error occurs in a direct statement, no line number is printed.

Format of error messages:
Direct Statement	?XX	ERROR
Indirect Statement	?XX	ERROR	IN YYYYY

In both of the above examples, "XX" will be the error code. The "YYYYY" will be the line number where the error occured for the indirect statement.

The following are the possible error codes and their meanings:

ERROR CODE	MEANING
BS	Bad Subscript. An attempt was made to reference a matrix element
	which is outside the dimensions of the matrix. This error can occur
	if the wrong number of dimensions are used in a matrix reference;
	for instance, LET A(1,1,1)=Z when A has been dimensioned DIM
	A(2,2).
CN	Continue error, Attempt to continue a program when none exists, an
	error occured, or after a new line was typed into the program.

DDDouble Dimension. After a matrix was dimensioned, another DIM statement for the same matrix was encountered. This error often occurs if a matrix has been given the default dimension 10 because a statement like A(I)=3 is encountered and then later in the program a DIM A(100) is found,

FC	Function	Call error, The parameter passed to a math	or string func-
	tion was	out of range. FC errors can occur due to:

1.A negative matrix subscript (LET A(-1)=0)

2.An unreasonably large matrix subscript (>32767)

3.LOG-negative or zero argument

4.SQR-negative argument

5.A^B with A negative and B not an integer

6.A call to USR before the address of the machine language