how to add x^0 or y^0 variable in the function(dblquad)!!

1 次查看（过去 30 天）
tony kevine
tony kevine 2015-4-20
评论： Star Strider 2015-4-20
i have question about how to automatic add x^0 in a3 for every item.Because i must need dblquad.when i use the command without add x^0 by hand .it will error!!
but actually i have a lot of things like a3 without x variable or y variable so i need help.
What command can automatic add x or y variable.
a3=((2*y)/3 - 1)^2*(5085106975559725/144115188075855872 + 3243695640608965i/18446744073709551616)
b3=matlabFunction(a3)
c3=dblquad(b3,-1,1-1,1)% it will error beacuse no x^0 so any one have good ideal about it

请先登录，再回答此问题。

回答（1 个）

Star Strider
Star Strider 2015-4-20
Your anonymous function ‘b3’ is a function of one variable. The MATLAB double integration functions want it to be a function of two variables. If you want to integrate it across ‘x’ as well, you would have to do something like this:
syms y x
a3=((2*y)/3 - 1)^2*(5085106975559725/144115188075855872 + 3243695640608965i/18446744073709551616)
c3 = vpa(int(int(a3, y, -1, 1), x, -1, 1), 10)
produces:
c3 =
0.1620497113 + 0.0008075665013i
Experiment to get the result you want.
  2 个评论
Star Strider
Star Strider 2015-4-20
The int function is in the Symbolic Math Toolbox.
The dblquad function will not work with your single-variable function ‘c3’.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Dates and Time 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by