QCHISQ

qchisq
The chisquare inverse distribution function

         x = qchisq(p,d)
	Input	p	probability
		d	degree of freedom
		(p,d can be scalar or matrix with common size)

	Output	F	for each element of p, F is the value at p of an 
			inverse of the chisquare cumulative distribution 
			function  d degrees of freedom