Numerical integration using a quad function

I have created the following function

    function x = rZSum(y, z)
    y= load('delta.txt');
    z = load('aSqr.txt');
    x = y./z;
    end

I would now like to use this function in numerical integration, evaluating it between 0 and 0.9999.

I have tried both

    quad(rZSum,0,0.9999)

and

    quadl(rZSum,0,0.9999)

with the same error being thrown up each time

    Error using fcnchk (line 103)
    FUN must be a function, a valid string expression, or an inline function object.

Would anyone be able to guide me on where I am going wrong, or what the error means? As integrating in matlab is new to me. Thank you in advanced!

[Star Strider]

For what you’re doing you probably don’t need a function anyway.

I suggest you first load 'delta.txt' and aSqr.txt' (or use one of the file reading functions like textscan), depending on the kind of files those are. You need to get the numerical values into the workspace first.

Then create x.

The trapz function might be more appropriate here.

[Benjamin Avants]

If that is your actual code and function call, you need to pass parameters y and z to you function rZSum

func(rZSum(y,z),0,0.9999)

fcnchk is trying to validate your function call and failing.

[Amy]

Thank you for the help, however when I run

    func(rZSum(y,z),0,0.9999)

The following error is now being thrown up

 Undefined function or variable 'y'.

And when I try to use

    trapz(rZSum,0,0.9999)

the following error is being thrown up

    Error using trapz (line 55) 
    X must be a vector.

[Benjamin Avants]

I feel silly about not catching this earlier, but if you're still having problems, you need to change the definition of your function. Since you load y and z from inside the function, you need to remove them as parameters from the function definition.