2020-11-25 11:43:19 +0200 received badge ● Notable Question (source) 2020-01-21 20:46:35 +0200 commented question matrix base ring changes by a complex multiplication Thank you very much. 2020-01-15 12:59:54 +0200 received badge ● Student (source) 2020-01-15 10:59:29 +0200 asked a question matrix base ring changes by a complex multiplication The complex multiplication of matrix changes the base ring. A = matrix(CDF,[[1,2],[3,4]]); print(A) B = 2*A C = I*A print(type(A)) print(type(B)) print(type(C))  The result is [1.0 2.0] [3.0 4.0]  So the multiplication by an imaginary number breaks the CDF property. This is very inconvenient for numerical calculations, because the symbolic computation is very slow. 2016-02-18 20:20:02 +0200 received badge ● Scholar (source) 2016-02-18 20:19:38 +0200 answered a question numerical value of hypergeometric function Thank you for telling me the correct usage. 2016-02-18 20:18:02 +0200 received badge ● Popular Question (source) 2016-02-13 09:01:57 +0200 commented question numerical value of hypergeometric function The special value of the hypergeometric 2F1 can be found in http://mathworld.wolfram.com/HypergeometricFunction.html (this page) or maybe its reference. By the way, 8/6 in my posting is typo.　Correctly, this is 8/5. 2016-01-31 21:07:42 +0200 asked a question numerical values of hypergeometric function fails? I want to compute the value of hypergeometric 2F1 like this. a=1/3; b=2/3; c=5/6; x=27/32 print n(hypergeometric([2,1],[a,b,c],x))  Sage math answered 16.9608452387059. But this should be 8.0/5=1.6000000. 2016-01-31 21:07:41 +0200 asked a question numerical value of hypergeometric function I want to compute the value of hypergeometric 2F1 like this a=1/3; b=2/3; c=5/6; x=27/32 print n(hypergeometric([2,1],[a,b,c],x)  Sagemath answered 16.9608452387059. But this should be 8/5=1.60000000. All the other numerical values are also unreliable. I hope this will be fixed in the next version.