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# trapezoidal numerical integration within a function

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Rhea Gorringe on 15 May 2020
Answered: Nikhil Sonavane on 19 May 2020
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.

#### 3 Comments

Ameer Hamza on 15 May 2020
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 on 15 May 2020
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 on 15 May 2020
Are you trying to integrate x*sin(x) from 1 to 100? What is the role of 'inarray' here?

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### Answers (1)

Nikhil Sonavane on 19 May 2020
I would suggest you go through the documentation of trapz function as that would help you trapezoidal numerical integration efficiently.

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