MATLAB: Is the line in the figure not showing up

linespecmultiple plot

I have multiple plots in same axes so i want to have 2 separate lines connecting the plots respectively. However my line is not showing eventhough my x and 0 marker shows up. What is the problem in my linespec?
for i=1:20;
    %TR1 is my output 1 and TY is my output 2  %
plot(i,TR1(i),'-rx',i,TY(i),'-bo','LineWidth',2)
    if i == 1
       hold on
    end
end
hold off
Here is the figure i get
P/S: my matlab version is R2018a

Best Answer

Create the plot after your loop (or dont use a loop at all) as so:
... end
figure(1))
x = 1:length(TR1);
plot(x,TR1,'-rx',x,TY,'-bo','LineWidth',2)
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