2024-07-26 20:50:48 +0200 commented question Minimize function Dear Emmanuel can you write the code for a simple example (polynomial function) for instance over [0,1]x[0,1] using mini 2024-07-25 21:10:20 +0200 asked a question Minimize function Minimize function Dear all, how can I find the (approximate) minimum of a (polynomial) function f on [0,2]x[0,2]? I tri 2023-11-20 09:03:15 +0200 commented question Function defined with an integral Thanks, it works. But Sage seems unable to remove the integral and write the derivative in a simple way... It also fails 2023-11-18 14:15:24 +0200 commented question Function defined with an integral Thank you. So nothing wrong with this functionâ€¦ But why I receive an error message if I try to differentiate it?!? I und 2023-11-16 14:26:12 +0200 asked a question Function defined with an integral Function defined with an integral Dear all, I'm puzzled by this answer from Sage: sage: def f(x): ....: return inte 2023-10-27 22:08:12 +0200 marked best answer Problem with matrix echelon form Dear all, if we define A to be A = matrix([[1,-3,0,2],[-2,4,0,h],[0,-2,1,k],[3,-1,7,1]]) A.echelon_form()  gives diag(1,1,1,1). But this is wrong for some values of h and k.In some cases the last 1 could be 0. How can I fix this? Thanks, N 2023-09-10 10:15:11 +0200 commented question Problem with matrix echelon form diag not drag :-) 2023-09-10 10:13:37 +0200 commented question Problem with matrix echelon form I see. Thanks. But in this case I have to enter the values for h and k. That's not what I want... I'd like Sage to tell 2023-09-09 12:27:11 +0200 commented question Problem with matrix echelon form Sorry not clear enough for me â€¦ What do you mean? 2023-09-07 07:03:34 +0200 asked a question Problem with matrix echelon form Problem with matrix echelon form Dear all, if we define A to be A = matrix([[1,-3,0,2],[-2,4,0,h],[0,-2,1,k],[3,-1,7,1] 2023-06-04 10:51:05 +0200 asked a question Integral of a sum Integral of a sum Dear all, I don't understand why I got Infinity calculating the integral of a polynomial over the inte 2023-05-21 15:01:05 +0200 received badge ● Student (source) 2023-05-21 14:49:06 +0200 asked a question Trigonometric equations Trigonometric equations Hello Is it possible to find all the solutions of a simple trigonometric equation? For instance