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1d
awarded  Good Question
1d
awarded  Popular Question
1d
revised How do I get my equation to have the form $(x-a)^2 + (y-b)^2 + (z-c)^2-d = 0$?
added 2 characters in body
1d
answered How do I get my equation to have the form $(x-a)^2 + (y-b)^2 + (z-c)^2-d = 0$?
Mar
24
awarded  Popular Question
Mar
11
awarded  Notable Question
Mar
10
asked Reduce and roots of an irrational inequality
Feb
9
comment Calculate area under a polyline
@MichaelE2 If I change the code into tmp = {{0, 0}, {1, 1}, {2, 1}, {3, 2}, {1, 6}}; plot = ListLinePlot[tmp, Filling -> Axis]; Area@DiscretizeGraphics[plot] I got the answer is 8. My maple has the same result. But your code is 6. I don't understand why?
Feb
2
accepted How to convert cube root of this equation into TeX?
Feb
2
asked How to convert cube root of this equation into TeX?
Jan
24
accepted How can I get all solutions of a system of equations with Reduce?
Jan
24
revised How can I get all solutions of a system of equations with Reduce?
added 11 characters in body
Jan
24
asked How can I get all solutions of a system of equations with Reduce?
Jan
7
awarded  Popular Question
Dec
23
comment How to select a list from a list?
I am sorry. I did.
Dec
23
comment How to select a list from a list?
If each element contains four points, for example, {{-5, -1, -1}, {-5, -1, 3}, {-5, 4, -2}, {3, -1, -5}}. I tried Select[nonright, (12 == Length[Union @@@ #] &)] it does not correct. Please help me.
Dec
22
comment How to select a list from a list?
Thank you very much.
Dec
22
comment How to select a list from a list?
@ belisarius In line Select[lst, ( 9 == Length[Union @@ #] &)] If I want 9 numbers different from 0. How can I select?
Dec
21
revised How to select a list from a list?
deleted 2 characters in body
Dec
21
comment How to select a list from a list?
Yes. I will edit my question.