functions in dawson.i - d

             dawson(x)  
 
    return Dawson's integral, exp(-x^2)*integral[0 to x](exp(t^2)*dt)  
    maximum is dawson(0.9241388730) = 0.5410442246  
    inflection point is dawson(1.5019752682) = 0.4276866160  

interpreted function, defined at i/dawson.i   line 6