When I minimize I get an error that “Edm is above max”.
This is because the estimated vertical distance to the minimum is above the max.
I am not sure how I can make this work.
thank you for your tests.
In the case of the Powell function, I found a problem in Simplex which I will fix now in CVS. In general, I would recommend you in this minimization problems to increase the parameter error to something larger like 0.1 or 1.
For the Woods function, I think the formula in the tutorial must have an error. When I run simplex on your example I get the minimum at
FVAL = -3.9, when the mimimum of the Wood function is at Zero.
FVAL = -3.92377
Edm = 3.41739e-10
Nfcn = 501
w = 0.584371 +/- 0.282853
x = 0.335878 +/- 0.159534
y = 0.985087 +/- 0.619821
z = -1.64947e-11 +/- 1.5409e-06
Minuit2 : minimum values for -3,-1,-3,-1
par0 = 0.584371
par1 = 0.335878
par2 = 0.985087
par3 = -1.64947e-11
I will try to find out the correct formula. I think it might be the one I modified in the attached script,