Numerical integration using a quad function
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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!
4 个评论
Star Strider
2014-3-14
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
2014-3-15
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
2014-3-15
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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2014-5-15
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