Why is the If Statement Not Working?

Hi guys,

I am trying to create a simple If Statement within a for loop, but I am not getting the correct results.

I am running a loop 6 times, and for i = 1 and i = 4 I want a different computation. Here is the code

Kc = [1 0 0 -1 0 0
      0 12 6*L 0 -12 6*L
      0 6*L 4*L^2 0 -6*L 2*L^2
      -1 0 0 1 0 0
      0 -12 -6*L 0 12 -6*L
      0 6*L 2*L^2 0 -6*L 4*L^2]

for i = 1:6
       if i 1 | 4
       Kc(i,:) = Kc(i,:)*(E*A)/L
else
       Kc(i,:) = Kc(i,:)*(E*I)/L^3

end
end

The above code does everything for

Kc(i,:) = Kc(i,:)*(E*A)/L

and not i = 2,3,5,6 for

Kc(i,:) = Kc(i,:)*(E*I)/L^3

Can someone explain and help please?

Many Thanks.

Answer 1

[Stephen23]

This code

if i 1 | 4

is exactly equivalent to writing

if i
    1 | 4

where the second line is calculated and the result immediately discarded, i.e. it does nothing useful at all.

You probably intended this:

if i==1 || i==4

or this:

if any(i==[1,4])

or this:

if ismember(i,[1,4])

[Scott Banks]

Brilliant, Stephen, Thank you!