MATLAB: Plotting between 2 points in 2017b

MATLABplotting line segments

clear all; close all force; clc;
% inputs
AR=5;
L=.5;
Swp_25=45;
%Calcs
b=1; % unit length here
Cr=(2*b)/(AR*(L+1));
Ct=L*Cr;
S=((Cr+Ct)/2)*b;
Swp_LE=atand(tand(Swp_25)+(4/AR)*(.25*((1-L)/(1+L))));
xpc=[0,.25,.50,.75,1.00];
% [Swp0,Swp25,Swp50,Swp75,Swp100]
Swp=atand(tand(Swp_LE)-(4/AR)*(xpc.*((1-L)/(1+L))));
qc=.25*Cr;%length of quarter chord
y11=0;
y12=.125*b;%1/8 of total wingspan
y21=y12;
y22=.25*b;%1/4 of total wingspan
y31=y22;
y32=.375*b;%3/8 of total wingspan
y41=y32;
y42=.5*b;% 1/2 of total wingspan
x11=qc;
x12=x11+y12*tand(Swp(2))*b;
x21=x12;
x22=x11+y22*tand(Swp(2))*b;
x31=x22;
x32=x11+y32*tand(Swp(2))*b;
x41=x32;
x42=x11+y42*tand(Swp(2))*b;
y1m=(y11+y12)/2;
y2m=(y21+y22)/2;
y3m=(y31+y32)/2;
y4m=(y41+y42)/2;
x75=qc*3;%x at 3/4 of root chord
x1m=x75+y1m*tand(Swp(4))*b;
x2m=x75+y2m*tand(Swp(4))*b;
x3m=x75+y3m*tand(Swp(4))*b;
x4m=x75+y4m*tand(Swp(4))*b;
%table
f=uifigure;
headers={'Panel','Xm','Ym','X1n','Y1n','X2n','Y2n'};
data=[1 x1m y1m x11 y11 x12 y21 
    2 x2m y2m x21 y21 x22 y22
    3 x3m y3m x31 y31 x32 y32
    4 x4m y4m x41 y41 x42 y42];
t=uitable(f,'Data',data,'ColumnName',headers);
%plot
y=0:.01:y42;
xLE=y.*tand(Swp(1));
xTE=Cr+y.*tand(Swp(5));
xle=xLE(end);
xte=xTE(end);
plot(xLE,y)
hold on
plot(xTE,y)
plot([Cr 0], [0 0])
TC1=[xle,y42];
TC2=[xte,y42];    % my issue is right here
plot(xle,y42,'x') % this works

plot(xte,y42,'x') % this works
plot(TC1,TC2)     % this does not work, plots line in wrong place
plot(x1m,y1m,'*')
plot(x2m,y2m,'*')
plot(x3m,y3m,'*')
plot(x4m,y4m,'*')
plot(x11,y11,'o')
plot(x21,y21,'o')
plot(x31,y31,'o')
plot(x41,y41,'o')
legend('Leading Edge','Trailing Edge','Root Chord','Tip Chord','CP1','CP2','CP3','CP4')
legend('Location','northwest')
I'm having some kind of problem with plotting one of my line segments. I can plot both end points of my line but when I try and plot the line between them it's in the wrong place. I'm so confused

Best Answer

Assuming your variable names are reasonable, TC1 and TC2 are both a 1x2 array containing x-data for the first element and y-data for the second element. So you are calling:
plot([x1 y1], [x2 y2])
But plot requires the first argument to be all the x-data, and the second argument to be all the y-data:
plot([x1 x2], [y1 y2])
So you have to rearrange how you make that call:
plot([TC1(1) TC2(1)], [TC1(2) TC2(2)])
-Cam
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