// Test Spline2D_interp
System.out.println("Testing Spline2D_interp");
for(i=0;i<4;i++)
for(j=0;j<4;j++)
y[i][j]=xx1[i]+xx2[j];
Spline2D_interp z = new Spline2D_interp(x1,x2,y);
localflag = abs(z.interp(2.5,2.5)-5.0) > sbeps;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** Spline2D_interp: .");
}