I need to plot an airfoil and it is just not looking right

It should be easy since I am just plotting the points but it isnt working and this is a little bit beyond my matlab experience

x1 = [.0028 .0139 .0359 .0682 .1102 .1609 .2191 .2837 .3530 .4257 .5000 ...
    .5743 .6470 .7163 .7809 .8391 .8898 .9318 .9641 .9861 .9972];
zu1 = [.0064 .0188 .0301 .0399 .0480 .0541 .0580 .0596 .0590 .0566 .0525 ...
    .0471 .0410 .0343 .0275 .0209 .0147 .0093 .0050 .0020 .0004];
zl1 = [-.0064 -.0188 -.0301 -.0399 -.0480 -.0541 -.0580 -.0596 -.0590 -.0566 ...
    -.0525 -.0471 -.0410 -.0343 -.0275 -.0209 -.0147 -.0093 -.0050 -.0020 -.0004];
ax=plotyy(x1,zl1,x1,zu1)
axis equal
axes(ax(2))
axis ij

When I plot it i get something vaugley wing shaped but its definitely not right.

Answer 1

[Joseph Cheng]

just curious why you are doing the plotyy?

 ax=plot(x1,zl1,x1,zu1)
 axis equal

should work just fine unless the y axis on zl1 and zu1 are not the same?

why it didn't look not right is that the y axis (left) and y axis (right) were not on the same scale.

[Chris]

haha wow I am dumb. I was following what the teacher gave to us. I just put in regular plot and it works fine. I figured I was overthinking it. Thank you! This community is so great with dumb questions!

[Joseph Cheng]

No problem and glad to help! dumb questions are welcome because we all make them. Especially if you've been staring at the same bit of code for ages.