Plot or mark a single point in App Designer

Hey, i know how to plot lines and functions etc. and am struggling on a real simple step.

I'd like to mark or plot a single point like "y=0 x =100" in a certain color.

It would be even great to write a short Text over or under this point like (X_CP).

Hope someone can solve this Problem.

Have a nice day and best regards,

Ermanno

Answer 1

[Cris LaPierre]

You have to add a second plot to your figure using hold on, and plot just the single point with your desired color and line style.

Using the x,y coordinates of that point, you can use the text function to add a custom label for that point to your figure.

[Ermanno Manca]

hey, yeah i know but how do i plot a single point with coordinates, with my desired color etc. would you mind giving me a short example? i can't find any command.

[Cris LaPierre]

The same way you plot a line, which you said you knew how to do, but with a single x and single y coordinate. If you need a refresher, check out the documentation for plot.

[Ermanno Manca]

Unfortunately that doesn't work.

x_CG is a point.

I tried " line (app.UIAxes,x_CG,0,'r'); " before and it always gives me an error.

[Cris LaPierre]

Perhaps a simple example adapted from here.

x = 0:pi/100:2*pi;
y = sin(x);
plot(x,y)
hold on
plot(1.5,0,'rs')
hold off
text(1.5,0.1,"x_CG","Interpreter", "none")

[Ermanno Manca]

Thanks a lot. It really helped me out!