Error when plot loaded .mat file in app designer

Hi !

I'm trying to plot data got from a .mat file but the following error pops up:

Error using plot
Unrecognized property x for class Line.

Error in app1/draw (line 25)
plot(app.UIAxes, t,x_grad(:,1))

Here are the code what I use:

I save the variables in two separate files

save('w_gradiens_lotka','w')
save('x_gradiens_lotka','x')

where x is a 61x2 matrix and w 61x1 vector

Then I load the two files and plot:

t=0:0.05:12;
 
w_grad = load('w_gradiens_lotka.mat','w');
x_grad = load('x_gradiens_lotka.mat','x');

%I have three charts:

drawnow
plot(app.UIAxes, t,x_grad(:,1))
drawnow
plot(app.UIAxes2, t,x_grad(:,2))
drawnow
plot(app.UIAxes3, t,w_grad)
drawnow

I dont know what did I miss here ...

Thank you for your help !

Answer 1

[Geoff Hayes]

Aron - I suggest you use the MATLAB debugger to step through the code and see what the variables

w_grad = load('w_gradiens_lotka.mat','w');
x_grad = load('x_gradiens_lotka.mat','x');

look like. I suspect that both are structures and that x_grad might have a field named x. In which case, your code would need to look like

plot(app.UIAxes, t,x_grad.x(:,1))

[Aron Horvath]

Yes, it was a struct, not a vector that was the thing what I missed, Thank you !