MATLAB: How to produce number labelling and annotations as shown below

label;numberplot

Hey guys, Question is obvious. I've tried googling this to no avail. Your help is appreciated.

My plots are similar to the one shown below. MATLAB's default colour labelling nor symbols isn't helpful when many of the plots are too close to each other.

Thanks Z

Best Answer

Here is an example of one approach.

figure('units','pix','pos',[624   474   672   504])
x = 0:.01:1; 
plot(x,cos(x).*exp(-x)+sqrt(x),'-',x,cos(x).*exp(-x) + sqrt(x).*exp(-x/12),'.')
annotation('textarrow',[.4 .5],[.5 .6],'String','1')
annotation('textarrow',[.6 .5],[.8 .68],'String','2')

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MATLAB: How to plot real and imaginary parts on one graph(figure)? And how to do that separately

No need for symbolics here...I'd use function handles instead--

xred=@(x) 6*pi*10.^8./x;  % make a simplification by defining the reduced x variable
epsilon =@(x) 1-(9.1./(xred(x).^2+0.005184)) + i*(5.96232./(xred(x).^3+0.005184*xred(x)));
a = @(x) 42592*pi*((1.1025*(epsilon(x)+4.205) + 0.16765*(epsilon(x)-2.1025))./ ...
                   (4.1025*(epsilon(x)+4.205) + 0.07102*(epsilon(x)-2.1025)));
x=400:600;   % independent variable range
y=a(x);      % evaluate over that range
plotyy(x,real(y),x,imag(y)) % plot the two components

NB: the Im components are near machine eps while the Re components are large but their magnitude only changes by a very small amount over the range.

MATLAB: Hi, how to overcome the error “Vectors must be the same length?”. Am trying to run a simulation, but with maximum time 25 the code works fine, however if I extend the final time it is responding the earlier error stated

There's not enough information here to say for certain, but I have a hunch.

When you specify t0 and tf, the ode solver automatically determines the number of points in the solution. Where you are running 4 different solutions, it is likely at least one of them has a different number of points in the output. This becomes an issue because you overwrite t each time you call ode45. Each plot will use the final value of t as the input for x, and when the number of x and y points are not the same, you will get this error message.

Assuming this is your error - I'd have to see the complete error message to say for certain - you have a couple options.

Use different variables to capture the output of each call to ode45 (i.e. [t1, y1], [t2, y2], etc.)
Specify a time vector for tspan. You can read more about this input argument here.

Best Answer

Related Solutions

MATLAB: How to plot real and imaginary parts on one graph(figure)? And how to do that separately

MATLAB: Hi, how to overcome the error “Vectors must be the same length?”. Am trying to run a simulation, but with maximum time 25 the code works fine, however if I extend the final time it is responding the earlier error stated

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