MATLAB: How do i change the X-axis to measure a different variable in simulink scopes

axesgraphscopesimulinkvariables

I am in need to plot a graph of speed vs voltage. In simulink, I am able to get the outputs for voltage and speeds separately but they are all set against the time variable, is there any way I can change this so that voltage appears on the x-axis and speed stays on the y-axis and this graph is plotted ?

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See X-Y graph block in Simulink: https://www.mathworks.com/help/simulink/slref/xygraph.html

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MATLAB: Changing Simulink Graph axis

The Simulink XY Graph block might help for this.

MATLAB: What are variable scopes

Consider that inside some function you define some variable, e.g.:

X = 3;

You might then ask yourself, now that I have defined it, where can I use that variable?

Can I use it from inside the same function? (yes, once it has been defined)

Can I use it from the base workspace? (in general, no)

Can I use it from inside another function? (in general no, but in some cases yes...).

The "variable scope" refers to the set of rules that let you know where that variable can be used:

https://www.mathworks.com/help/matlab/matlab_prog/check-variable-scope-in-editor.html

For example, nested functions are very useful in many situations, and one of their main features is that variables defined in the "parent" workspace can be use in the nested functions' workspace/s:

function mymain()
X = 3; % the scope of X includes both MYMAIN and MYNEST.

...
    function mynest()
        X = X+1 % the scope of X includes both MYMAIN and MYNEST.
        Y = 0;  % the scope of Y is MYNEST only.
    end
...
end

https://blogs.mathworks.com/loren/2008/01/16/nested-functions-and-variable-scope/

A similar concept also applies to functions (which can be saved on the MATLAB Search Path, or saved in a private folder, or as a function handle within some workspace/s, etc).

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MATLAB: Changing Simulink Graph axis

MATLAB: What are variable scopes

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