Apple II User Manual

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.

    DD         Double 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