# Draw a curve in matlab figure

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Rudolf on 26 Apr 2021
Commented: Rudolf on 27 Apr 2021
I need to draw a curve for illustration purposes in a figure together with some other more specific values. I'm looking for something like this: I need it to be smooth like that one, and have the ability to adjust it. How could i do that?
DGM on 26 Apr 2021
Edited: DGM on 26 Apr 2021
If you have a few waypoints, you might just be able to do something like this:
x = [0 1 2 2.5 3 4 5 6 6.2 7 8];
y = [0 0.5 1 0.95 0.65 0.25 0.8 1.3 1.3 0.7 0.1];
xf = linspace(0,8,100);
yf = interp1(x,y,xf,'spline');
plot(xf,yf)
axis equal There are also ROI drawing tools (drawfreehand, imfreehand), but I don't know how you'd easily go about making such an object into an open curve. Depending on how it needed to be integrated into the figure content, I'd probably just export the figure and add the curve in an image editor that can do practical bezier curves interactively.
Rudolf on 27 Apr 2021
Thank you, your code is a good way to do it, and makes it easy to adjust the curve. I guess the code is the fastest way to a satisfying result.

Jan on 26 Apr 2021
figure;
x = linspace(0, 2*pi, 1000);
y = sin(x).^2 + sin(x / 2).^2 .* x / 10;
plot(x, y) Rudolf on 27 Apr 2021
Thank you, this is definately a way to do it if good at math.