Hi, My values are coming different than the answers, even though I have typed the same code as given in the paper, could you please help me out? Notebook is attached. I was expecting k1=0.062959 and k2=0.0211523
2011IJMEST.pdf (1.38 MB)
parameters new.nb (17.6 KB)
It seems to me that your function SS vanishes on the two axes k1=0 and k2=0, and it is positive elsewhere. No wonder that the numerical minimization method converges to a point very close to k1=0. If you are expecting a minimum point elsewhere, then you may check again how you defined the functions.