Is there any way how to integrate a double variable

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?

Answer 1

[Titus Edelhofer]

Hi,

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

Titus

Answer 2

[Meva]

Many thanks Titus I will definitely use.