SECTION 6.

PATERN

For description of the algorithm see R.Hooke and T.A.Jeeves,
Direct Search Solution of Numerical and Statistical Problems, *Journal
of the Association for Computing Machinery*, 8 (1961),212-21

STORAGE REQUIREMENTS

NQ = i2 = NP

TERMINATION FLAGS

IER = Greater than 0 if optimum is achieved

IER = 1 Attempted step size is less than ACC (absolutely)

IER = -1 Iteration limit exceeded

IER = -3 Input error

IER = -4 Not enough scratch storag

IER = -9 Function error in first FUNC call

IER =-13 No stopping criterion enabled

SECTION 6.1 OPTIONS

Besides the general options the following are available. The option which will most likely be of interest to the user is STPSIZ and its default value can be modified by the user.

COMMON/BPAT/STPSIZ,SHRINK

STPSIZ = Initial stepsize (normally set
greater than 1/20th of the probable range within which the true
value lies). Default value is 1

SHRINK = Shrinkage factor for STPSIZ (between 0.1 and 0.9)
Default = 0.5