public String toString() {
return Util.pretty(val, true);
}
// run optimzer
public void optimize(RTContext ctxt, OptimResults r, OptimCallbacks cbs) throws Xcept {
// initialization
res = r;
args = res.args;
this.cbs = cbs;
if (Util.hasNaNs(args.xmin) || Util.hasNaNs(args.xmax))
throw new Xcept(this, "xmin & xmax required");
// xstart defaults to min+max/2
for (int i = 0; i < args.nx(); i++)
if (Double.isNaN(args.xstart[i])) args.xstart[i] = (args.xmax[i] + args.xmin[i]) / 2;
// results and work area allocation
int n = args.nx();
int[] nfout = new int[2];
double[] tlout = new double[2];
int[] istat = new int[1];
double[] p = new double[n * (n + 1)];
double[] y = new double[n + 1];
int[] fnums = new int[n + 1];
double[] pbar = new double[n];
double[] pstar = new double[n];
double[] pdstar = new double[n];
// call native method (fortran)
try {
int threadInx = (ctxt == null) ? 0 : ctxt.threadInx;
simplx(
threadInx,
ctxt,
n, // int != jint, must calloc
args.xstart,
args.xmin,
args.xmax,
args.xistep,
new double[] {args.stepTol}, // saves calloc
args.maxCalls, // int != jint, must calloc
new double[] {args.errTol}, // saves calloc
res.bestX,
nfout,
tlout,
istat,
p,
y,
fnums,
pbar,
pstar,
pdstar);
// get simplex specific results
res.status = istat[0];
res.finalStep = tlout[1];
switch (istat[0]) {
case 4:
res.status = OptimResults.ERROR;
if (Util.isBlank(res.termMsg)) res.termMsg = "Optimiation canceled by user";
break;
case 3:
res.status = OptimResults.NORMAL;
res.termMsg = "Met # calls stopping criterion";
break;
case 2:
res.status = OptimResults.NORMAL;
res.termMsg = "All vertices have same func value";
break;
case 1:
res.status = OptimResults.NORMAL;
res.termMsg = "Met step size stopping criterion";
break;
case 0:
res.status = OptimResults.NORMAL;
res.termMsg = "Met mean sqr error stopping criterion";
break;
case -1:
res.status = OptimResults.ERROR;
res.termMsg = "Nonsensical parameters supplied";
break;
case -2:
res.status = OptimResults.CANCEL;
res.termMsg = "Error midway through optimization";
break;
case -3:
res.status = OptimResults.ERROR;
res.termMsg = "Error during first func evaluation";
break;
case -4:
res.status = OptimResults.ERROR;
res.termMsg = "Canceled during first func evaluation";
break;
default:
res.status = OptimResults.ERROR;
res.termMsg = "Undocumented error code (" + istat[0] + ")";
break;
}
// pretty up any errors
} catch (Exception e) {
if (e instanceof Xcept) {
Xcept xe = (Xcept) e;
res.termMsg = xe.cleanMessage();
throw xe;
} else {
res.termMsg = e.getMessage();
throw new Xcept(this, res.termMsg);
}
}
if (res.status == OptimResults.ERROR) throw new Xcept("Simplex optimizer: " + res.termMsg);
}
public RealConst(String sv) {
super();
val = Util.toDouble(sv);
unit = null;
}