I have been trying to derivate equation under to find the formula for 3 parameters Weibull distribution as same as picture. Can someone please help me fix it?
syms m sigma_i sigma_0 sigma_th i N
lnL = symsum(ln((m/sigma_0) * ((sigma_i – sigma_th) / sigma_0))^(m-1) * exp(-(((sigma_i – sigma_th) / sigma_0) ^m)), i, 1, N);
Df_m = diff(lnL,m)
Df_sigma_0 = diff(lnL,sigma_0)
Df_sigma_th = diff(lnL,sigma_th)syms m sigma_i sigma_0 sigma_th i N
lnL = symsum(ln((m/sigma_0) * ((sigma_i – sigma_th) / sigma_0))^(m-1) * exp(-(((sigma_i – sigma_th) / sigma_0) ^m)), i, 1, N);
Df_m = diff(lnL,m)
Df_sigma_0 = diff(lnL,sigma_0)
Df_sigma_th = diff(lnL,sigma_th) syms m sigma_i sigma_0 sigma_th i N
lnL = symsum(ln((m/sigma_0) * ((sigma_i – sigma_th) / sigma_0))^(m-1) * exp(-(((sigma_i – sigma_th) / sigma_0) ^m)), i, 1, N);
Df_m = diff(lnL,m)
Df_sigma_0 = diff(lnL,sigma_0)
Df_sigma_th = diff(lnL,sigma_th) derivatives of expressions with several variables MATLAB Answers — New Questions
