using arrayfun for a function with multiple inputs

I want to call my Before function with a 1 x 40 structure called struct for the s input, a value of 0 for the begins input, and a value of 20 for the ends input, but I can't figure out how to make it work with arrayfun correctly.

Here's what I have now, and the error that it gives me is at the bottom:

x = arrayfun(@Before, [struct,0,20]);

function v = Before(s,begins,ends)

        Numbers = s.H;

        firstColumn = Numbers(:,1);

        rowsUnder = (firstColumn>begins)&(firstColumn<ends);  

        sNumNew = Numbers(rowsUnder,:); 

        v = mean(sNumNew(:,3));         

end

Error using horzcat
The following error occurred
converting from double to
struct:
Error using struct
Conversion to struct from double
is not possible.

Error in ComparingMeans (line 22)
x = arrayfun(@Before,[struct,0,20]);

Answer 1

[Matt J]

Multiple arrayfun arguments should not be concatenated. You need to do

x = arrayfun(@Before, myStructure, 0 , 20);

Since "struct" is also the name of a built-in MATLAB function, you will minimize coding hazards if you use a different name for it, like I did.

[Michael]

oh yes yes I didn't realize that, but now, when I try to run:

x = arrayfun(@Before, myStructure, 0, 20);

it gives me this error:

Error using arrayfun All of the input arguments must be of the same size and shape. Previous inputs had size 43 in dimension 2. Input #3 has size 1.

Error in ComparingMeans (line 22) Mean(1,:) = arrayfun(@BeforeMean, myStructure, 0, 20);

[Matt J]

Instead of passing scalars for 0 and 20, you'll have to pass vectors of the same length as myStructure

d=size(myStructure);
a=zeros(d); 
  b=a;
b(:)=20;

x = arrayfun(@Before, myStructure, a, b);

That's very strange. I thought arrayfun did scalar expansion. That might be only for gpuArrays....

[Michael]

ah thanks, it works now

Answer 2

[Andrei Bobrov]

b1=0;
e1=20;
x = arrayfun(@(x1)Before(x1,b1,e1), your_structure)

[Michael]

Yes, this also works, thanks

[Anik Hirenkumar Shah]

this worked for me as well. Thanks