2020-01-10 14:16:24 -0600 received badge ● Popular Question (source) 2018-04-16 08:02:15 -0600 received badge ● Nice Question (source) 2018-04-11 12:19:51 -0600 asked a question Non-linear regression with arbitrary precision arithmetic I'm looking to do something like this: R = RealField(1000) data = [[R(1),R(5)],[R(5),sqrt(R(6))],[R(8),R(9)]] var('a, b, c, x') model(x) = a*x*x + b*x + c find_fit(data, model)  However when I run this a,b and c seem to have been truncated to a double. How would I get arbitrary precision out of find_fit? 2015-12-31 11:01:07 -0600 received badge ● Supporter (source) 2015-12-30 18:58:16 -0600 asked a question Expanding cos(a*(x+y)) I'm having trouble finding out how to expand a*(x+y) when wrapped by cos(). The expression expand(a*(x+y)) expands as expected, but expand(cos(a*(x+y))) , leaves the expression unchanged. I would prefer a solution that scales for more complex expressions 2015-12-28 03:02:50 -0600 received badge ● Student (source) 2015-12-28 01:59:08 -0600 asked a question Converting expression to list of terms and back Given an expression how would I convert it to a list, and how would I convert a list to an expression? For example: x * b * cos(x^3) * sin(b)+b * cos(x)+h * sin(x) Would convert to: [x * b * cos(x^3) * sin(b),b * cos(x),h * sin(x)] 2015-12-28 01:59:08 -0600 commented question Trouble building sage from source inside a docker container You mentioned that the above doesn't work. Is there a specific error?