how to Integral function with two independent variables ?

Question

xiaoqian chang 2021-2-2

回答： Shubham Rawat 2021-2-8

I need to integrate my function with two variables,and the date is a matrix with two columns，the function is：

i=100,and the variables x and y is knowed.

I think maye i shoule use the function integral2,but i dont konw how to deal with the "i"

I try to write some code,maybe is it right? but the bold code ,i don't know how to write

for i=1:100

x=data(:,1);

y=data(:,2);

f=@(x,y)(x/y)(x+y) ;

q = integral2(fun,xmin,xmax,ymin,ymax,Name,Value)

anyone can help me ??

Thank you very much ！

Bjorn Gustavsson 2021-2-2

Your problem description is a bit unclear, you'll get better help if you make it clearer.

Answer 1

Shubham Rawat 2021-2-8

Hi,

You are using variables

and

but your limits are on i. So I am not able to figure out who are the variables which you want to integrate.

You may use summation here instead of using integration. You can use help from the following code:

x=data(:,1);
y=data(:,2);
sum = zeros(100,1);
for i=1:100
    sum(i) = (x(i)/y(i))*(x(i) + y(i));
end

Hope this Helps!