Using if statement to redefine results during for loop

Ok so I am trying to perform a vortex panel method calculation for a school project and am running two iterations for two different number of panels (i.e. 8 panels & 16 panels). Since I can't just store the results in a final matrix due to each iteration resulting in different matrix dimensions, I am trying to run an if elseif loop within the overall for loop as seen below that would redifine the results of each iteration in variables labeled for that specific panel count. For some reason though when I run the code and try to call the redefined variables it tells me that they are all unrecognizable. Hopefully this is a minor fix that I am just not seeing but I am overall very confused as to what the issue is. It's almost as if the second if loop is being passed over which doesn't make sense since i am using a similar method to change the panel geometries at the beginning of the for loop as shown and that works.

for p = 1:2
if p == 1 %Wing Geometry for 8 Panels
        XLE = [0.0; 0.0; 5.52; 12.0; 20.01; 28.06; 36.10; 44.25; 48.61];
        YLE = [0.0; 6.87; 12.88; 20.00; 30.00; 40.00; 50.00; 60.00; 65.56];
        XTE = [33.03; 33.03; 33.03; 36.15; 41.01; 45.64; 50.43; 55.11; 57.80];
        YTE = [0.0; 6.87; 12.88; 20.00; 30.00; 40.00; 50.00; 60.00; 65.56];
    elseif p == 2 %Wing Geometry for 16 Panels
        XLE = [0.0; 0.0; 0.0; 2.76; 5.52; 8.76; 12.0; 16.005; 20.01; 24.035; 28.06; 32.08; 36.1; 40.175; 44.25; 46.43; 48.61];
        YLE = [0.0; 3.435; 6.87; 9.875; 12.88; 16.44; 20.0; 25.0; 30.0; 35.0; 40.0; 45.0; 50.0; 55.0; 60.0; 62.78; 65.56];
        XTE = [33.03; 33.03; 33.03; 33.03; 33.03; 34.59; 36.15; 38.58; 41.01; 43.325; 45.64; 48.035; 50.43; 52.77; 55.11; 56.455; 57.80];
        YTE = [0.0; 3.435; 6.87; 9.875; 12.88; 16.44; 20.0; 25.0; 30.0; 35.0; 40.0; 45.0; 50.0; 55.0; 60.0; 62.78; 65.56];
    end 

... a bunch of code that works...

if p == 1; 
        y_8p = C(:,2); %8x1 matrix
        Gamma_8p = Gamma; %8x1 matrix
        CL_8p = CL; %value
        CDv_8p = CDv;
        GammaIdeal_8p = GammaIdeal;
        CL_Ideal_8p = CL_Ideal;
        CDv_Ideal_8p = CDv_Ideal
    elseif p == 2;
        y_16p = C(:,2);
        Gamma_16p = Gamma;
        CL_16p = CL;
        CDv_16p = CDv;
        GammaIdeal_16p = GammaIdeal;
        CL_Ideal_16p = CL_Ideal;
        CDv_Ideal_16p = CDv_Ideal
    end
p = p + 1;
end

[David Fletcher]

The variables referred to in the second if block aren't defined anywhere in this code segment - presumably they are defined elsewhere? C, Gamma, CL, CDv ... etc. (maybe in that bit that says ...a bunch of code that works?)

Also, it's probably nothing to do with the issue, but I'm not sure why you are incrementing p near the end? It's a for loop - it increments itself.

[Ryan Coney]

all variables are defined and calculated before being redefined. I just didn't want to post my entire code but they are there and when I unhide them from the code they display correctly the value for the 8 panel and then the 16 panel. The issue is that for some reason those values are not being redefined by the if statement in the second block.

[Ryan Coney]

I need to compare the Gamma results from both 8 panel and 16 panel cases and figured this would allow me to do that since if I did not redefine them, the 2nd iteration would just overwrite all values and I would just be left with the results of the 16 panel case that is ran last

[David Fletcher]

Ok, but without those definitions nobody else can run the code. If I take out that second if block that I don't have the definitions for, when I run it the first block correctly allocates the XLE, YLE, XTE and YTE values on each iteration - so the problem would seem to be somewhere in the bit that is omitted. Maybe someone else can see something I can't.

[Ryan Coney]

I ended up figuring it out. i thought i needed the incrementing within the for loops and that actually is what was causing the problem. By doing that in multiple for loops prior to reaching that end block the values ended up being 8 and 16 instead of the 1 and 2 i had expected.