Is there any way how to integrate a double variable

2014 10 9
2 个回答
回答已采纳
更新时间：2014 10 10
15 次查看（30 天）

0 个投票

Hi,
I have a script for calculating lots of variables with changing time and x_lateral position. I want to integrate one of these changing variables as related part shown below:
for i=1:ii
x=(i-1)*dx;
fikness=fik*sin(pi*x);
gap1(i)=(H1-0.5*fikness-A*(x-1/2));
end
massflux_first(i)=(int(gap1(i),x,0,1))
Inside gap1 function H1 and A varies in the whole program and x of course. so when I execute the error :
Undefined function 'int' for input arguments of type 'double'.
Error in ******* (line ***)
massflux_first(i)=(int(gap1(i),x,0,1))
When I look at workspace it says
gap1 is double.
Could anyone help me?

请先登录，再回答此问题。

 采纳的回答

Titus Edelhofer
Titus Edelhofer 2014-10-9

0 个投票

Hi,
for a vector gap1 you can use the function trapz as a simple way of integrating...
Titus

更多回答（1 个）

Meva
Meva 2014-10-10
编辑：Meva 2014-10-10

0 个投票

Many thanks Titus I will definitely use.

类别

在 帮助中心 和 File Exchange 中查找有关 Numerical Integration and Differentiation 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