Having trouble with functions

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Matthew Benjamin 2014-2-10

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评论： Matthew 2014-2-10

So I have this problem for school and I don't know how to take an element out of an array or matrix and put it into another one. Here is the question:

Create a function meancomp that compares the mean value of the odd numbered elements with the mean value of the even numbered elements and returns:
0, if they are equal
1, if the mean of the odd numbered elements is greater,
2, if the mean of the even numbered elements is greater"

This is what I have:

for m=1:length(x)
 if mod(x,2)==0    % code end

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Answer 1

Image Analyst 2014-2-10

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No. Just extract them like this

oddElements = A(1:2:end);

same for even but you start at 2 instead of 1, though you can still end at "end". To find the mean of an array, use mean

oddMean = mean(oddElements);

I trust you can take it from there because you know how if/else statements work.

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Matthew 2014-2-10

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This was extremley helpful, thank you.

My problem now is making the if/else statements into one function called meancomp. This is what I have and it only displays '2'.

function p=meancomp(A)
oddElements=A(1:2:end);
evenElements=A(2:2:end);
oddMean=mean(oddElements);
evenMean=mean(evenElements);
if evenMean==oddMean
  disp('0');
elseif evenMean<oddMean
  disp('1');
else
  disp('2');
end
end