solve returns a list, so you need to use optimal_x[0] to get the first element.
But anyway, since you are solving for x, the result from solve does not contain x, so the subs would do nothing. Aaron Meurer On Sat, Jul 1, 2017 at 8:14 AM, Zing <[email protected]> wrote: > Hi, > > I am not able to do substitution of one expression into another. Can anyone > tell me why. The last line of the code is throwing an error. > > Thanks. > > Ankur Sinha > > P.S. I posted this message a while ago but am not able to see it in the > topics. Apologies if this attempt leads to two posts. > > from IPython.display import display, Math > from sympy import * > > #Production > x = symbols('x') > #Tax > t = symbols('t') > #Level of automation (varies between 0 and 1) > l = symbols('l') > > #Parameters > a,b,c,d,e,f,g,h = symbols('a b c d e f g h') > k,m,alpha = symbols('k m alpha') > > #Solving firm's problem with automation tax > priceF = a - b*x > #Cost without automation > costWoutAutomation = d*x**2 + e*x + f > > #Firm's profit > profitF = (1-alpha)*(priceF*x - costWoutAutomation) > > #Solving > foc_x = diff(profitF,x) > optimal_x = solve(foc_x,x) > > print(optimal_x) > > print(optimal_x.subs(x,k)) > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/7fe6b265-dc97-401f-aefc-86419c04164b%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6%2BTwzFjPHNOiP7hGjXvSt-LP7%3D7zCgu_sVWNrk0SH8wHA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
