Adding a Legend with Variables as inputs

Im very new to MATLAB and Ive got a script which takes in an array determined by the user, does some calculations and then plots it on a graph with the x-axis being in the range chosen by the user. So, naturally the number of curves in my graph will be a variable so how do I get it to show what on the legend. This is what Ive got so far but it is not working. (lambda is a constant).

hold on
for  r = (minr : incrr : maxr) %start the plotting
    z = (r./lambda).*((r./lambda).^(r-1)).*(exp(-(x./r).^r)); %The equation
    plot(x,z)
    xlabel('x');
    ylabel('f(x)');
    title('GRAPH__1');
end

for i = minr : incrr : maxr
    labelr = sprintf('r = %.2f',r);
end
for j = lambda
    label_lambda = sprintf('lambda = %.2f',lambda);
end
legend(labelr,label_lambda);

hold off

[Adam Danz]

@JDM_master, I've formatted your code so that it's correctly indented. To easily smart-indent you code from the Matlab Editor, highlight all of it (ctrl+a) and smart indent (ctrl+i). Its so much more readable this way.

Answer 1

[Adam Danz]

Try this.

hold on
for  r = minr : incrr : maxr %start the plotting
    z = (r./lambda).*((r./lambda).^(r-1)).*(exp(-(x./r).^r)); %The equation
    plot(x,z,'DisplayName',sprintf('r = %.2f',r))
    xlabel('x');
    ylabel('f(x)');
    title('GRAPH__1');
end

% I'm not sure what this section is about....    
% for j = lambda
%    label_lambda = sprintf('lambda = %.2f',lambda); end
% end
legend(); % no need for inputs if you're using DisplayName
hold off

[Travis Malouf]

@Adam Danz beat me to it. Displayname is a great tool to add to your Matlab plotting knowledgebase

[JDM_master]

Thanks Adam!!! That displays the values perfectly but it doesn't show the corresponding colours of the graph next to it. Any idea how to display the corresponding colours next to it?

[Adam Danz]

Really? That's hard to imagine. Could you add a screenshot of your figure? How does your code differ from the demo code?

[JDM_master]

The code is not different from the demo code, I have attached the graph so you can see what it looks like. : )

[Walter Roberson]

What does

opengl info

Show for you?

[JDM_master]

opengl info
                          Version: '4.5.13572 Compatibility Profile Context 19.11.3 26.20.13031.18002'
                           Vendor: 'ATI Technologies Inc.'
                         Renderer: 'AMD Radeon(TM) Vega 8 Graphics'
            RendererDriverVersion: '26.20.13031.18002'
        RendererDriverReleaseDate: '15-Nov-2019'
                   MaxTextureSize: 16384
                           Visual: 'Visual 0x08, (RGBA 32 bits (8 8 8 8), Z depth 16 bits, Hardware acceleration, Double buffer, Antialias 8 samples)'
                         Software: 'false'
             HardwareSupportLevel: 'full'
        SupportsGraphicsSmoothing: 1
    SupportsDepthPeelTransparency: 1
       SupportsAlignVertexCenters: 1
                       Extensions: {303×1 cell}
               MaxFrameBufferSize: 16384

This is what it shows when I type that in

[Adam Danz]

Is the problem fixed after running this command?: opengl software