Store plot values in a variable and then plot it

I am trying to save the values of the first figure in a variable and then plot it.

But as you can see my code doesn't plot the same thing in the first figure and in the second one.

I don't know if plotdata.XData(index) and plotdata.YData is what doesn't work or if it is the greiddedInterpolant.

M=200; %Slope of my lines

x=linspace(0,M,127);

y=linspace(0,1,127);

x1=linspace(M,255,127);

y1=linspace(1,0,127);

hold on

plotdata=plot(x,y)

plotdata1=plot(x1,y1);

hold off

[~, index] = sort(plotdata.XData);

F = griddedInterpolant(plotdata.XData(index), plotdata.YData(index));

[~, index] = sort(plotdata1.XData);

F1 = griddedInterpolant(plotdata1.XData(index), plotdata1.YData(index));

F2=[F.Values F1.Values];

figure

plot(F2)

Answer 1

[Simon Chan]

F.Values and F1.Values are those y-values only and hence the plot does not have any information about the corresponding x-values.

The x-value are stored in F.GridVectors and F1.GridVectors so modifying the last line is able to plot the 2nd figure correctly,

M=200; %Slope of my lines
x=linspace(0,M,127); 
y=linspace(0,1,127);
x1=linspace(M,255,127); 
y1=linspace(1,0,127);
plotdata=plot(x,y);
hold on
plotdata1=plot(x1,y1);
hold off

[~, index] = sort(plotdata.XData);
F = griddedInterpolant(plotdata.XData(index), plotdata.YData(index));
[~, index] = sort(plotdata1.XData);
F1 = griddedInterpolant(plotdata1.XData(index), plotdata1.YData(index));
figure
plot([F.GridVectors{1},F1.GridVectors{1}], [F.Values, F1.Values]);