Chi
Hyperbolic cosine integral.
 
Loading        LOADSUB ALL FROM "EI.HTS"
or LOADSUB FROM "MATHLIB.HTS"
 
Usage                REAL X,Y
Y=FNChi(X)
 
Description                
FNChi returns the value of the hyperbolic cosine integral of x, Chi(x). Chi(x) is defined by the relation
         where γ is Euler's number; γ = 0.57721566490153...
 
The real version of Chi(x) is only defined for positive values of x. Large positive values of x may produce results greater than MAXREAL, the largest value representable.
 
Chi(x)
 
Errors
FNChi causes an HTBasic error if its argument is not of type REAL. It also causes an error if the value of x is negative or zero or if Chi(x) would be greater than MAXREAL.
 
See Also
Ei, Ci, Shi, Si