functions in gamma.i - l

             ln_gamma(z)  
 
     returns natural log of the gamma function.  
     Error is less than 1e-13 for real part of z>=1.  
     Use lngamma if you know that all z>=1, or if you don't care much about  
     accuracy for z<1.  
interpreted function, defined at i/gamma.i   line 16  

             lngamma(x)  
 
     returns natural log of the gamma function.  
     Error is less than 1e-13 for real part of x>=1.  
     Use ln_gamma if some x<1.  
interpreted function, defined at i/gamma.i   line 37