Using an if statement to differentiate between odd and even numbers

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Given two Qbar matricies and the number of ply layers in a composite, I am trying to calculate the A,B, and D stress matricies.
My first error is calculating h. Given an even number of ply, h is calculated one way, and given an odd number of ply, h is calculated another way. I have tried coding that below but all my attempts have been unsuccessful.
My second problem is figuring out how to tell matlab that the odd numbered layers draw their values from one Qbar matrix and the even numbered layers draw their values from a different Qbar matrix and all the values are summed.
function[A B D] = ABD(Qbar1,Qbar2,n)
x = 0:1:n;
if n == 2*x+1 % odd number of ply
h = -(n/2):1:(n/2);
elseif n == 2*x % even number of ply
h = -n:1:n;
end
disp(h)
for k = 1:n; i = 1:3; j = 1:3;
for k = [1 3 5]
Qbar(i,j,k) = Qbar1;
end
for k = [2 4]
Qbar(i,j,k) = Qbar2;
end
A(i,j) = Qbar(i,j,k)*(h(k+1)-h(k));
B(i,j) = (1/2)*Qbar(i,j,k)*((h(k+1)^2)-(h(k)^2));
D(i,j) = (1/3)*Qbar(i,j,k)*((h(k+1)^3)-(h(k)^3));
end

Risposte (1)

Jon Brenner
Jon Brenner il 26 Nov 2013
In order to determine if a number is odd or even in MATLAB, use the mod function.
if mod(x, 2) == 0
% x is even
else
% x is odd
end
  2 Commenti
Christopher Marlar
Christopher Marlar il 26 Nov 2013
I'm not trying to determine if x is odd of even. I'm trying to tell matlab that if n is odd, h = something and if n is even, h is something else.
Jon Brenner
Jon Brenner il 26 Nov 2013
Modificato: Jon Brenner il 26 Nov 2013
If you replace x with n and copy what you were trying to do into my if statement, you get this:
if mod(n, 2) == 0
% n is even
h = -n:1:n;
else
% n is odd
h = -(n/2):1:(n/2);
end

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