trapezoidal numerical integration within a function

Hello :)

I need to perform a trapezoidal intergration however i am unsure how to do this inside a fuction as i have only every done it with out. any help is very much apriacted.

[Ameer Hamza]

There is no difference in calling a function inside or outside a function. Have you written your own code for trapezoidal integration, or are you using trapz()?

[Rhea Gorringe]

trapz() i think. this is my first time trying to use matlab on my own i have this so far (i know it wrong)

function tarea = trapezint(inarray,llim,ulim)
    inarray=0;
    llim=1;
    ulim=100;
    h=(llim-inarray)/ulim;
    sum=0;
    f=@(x) x.*sin(x);
for i=1:1:n-1
    sum= sum + f(inarray+i*ulim);
   
    
    qt=sum((h*f((x(1:ulim)+x(2:ulim+1)))/2)

[Ameer Hamza]

Are you trying to integrate x*sin(x) from 1 to 100? What is the role of 'inarray' here?

Answer 1

[Nikhil Sonavane]

I would suggest you go through the documentation of trapz function as that would help you trapezoidal numerical integration efficiently.