Hi, i’m new in Matlab and i can’t understand what is the problem using integral, the error occured is First input argument must ne a function handle, thanks for the help.

C1=zeros(1,np);

For j=1:np

x1=0;

x=delta; %delta just defined

R_px=@(x) sqrt((dxxp-(c*x+dxx)).^2+(dyyp-(d*x+dyy)).^2+(dzzp-(f*x)+dzz)).^2);

C1(j)=integral((exp(-R_px(x)*ck)./(R_px(x).^3)),x1,x2);

Answer 1

[Shrestha Kumar]

Hi,

You cannot directly give a expression as a parameter to the integral function.

So you need to define a new function with definition (exp(-R_px(x)*ck)./(R_px(x).^3)) and then provide the handle(name) of the function to the integral function.

[Antonio Sunseri]

C1=zeros(1,np);

For j=1:np

x1=0;

x=delta; %delta just defined

R_px=@(x) sqrt((dxxp-(c*x+dxx)).^2+(dyyp-(d*x+dyy)).^2+(dzzp-(f*x)+dzz)).^2);

fun=exp(-R_px(x)*ck)./(R_px(x).^3)

C1(j)=integral(fun,x1,x2);

[Antonio Sunseri]

Thanks for the answer but i think i made also a mistake because it gives me the same error

[Antonio Sunseri]

Ok thanks a lot i founded the other problem, now is Ok