Numerical integration using a quad function

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Amy 2014-3-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/121583-numerical-integration-using-a-quad-function

评论： Benjamin Avants 2014-5-15

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!

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Amy 2014-3-15

在 MATLAB Online 中打开

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 2014-5-15

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.

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