First plot x y.
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Aquatris on 9 Jun 2018
Why do you want to do it in simulink but not in script? Given the simplicity of the thing you want, script is a better option. Simulink is more convenient when trying to solve time dependent equations. To explain the observed behaviour, I am gonna guess the Re1 block you have contains a vector. Re1 block is a constant block so no matter what, it outputs the same values. That is why you have flat lines in your scope where the values corresponds to elements of Re1 block as well as the output of Lc block. The Scope uses time values for x-axis, and when you supply two inputs to it, both are shown in y-axis with different colors. In your case, both signals are vectors, hence you have a lot of flat lines. What you are trying to do, this is my guess and is not clear in your question, is for Re1 block to spit out different scalar values in each time step so that you can create a nice xy plot. For simulink you can try something like this;
However, the same thing is much easier in script;
Re1 = 0:0.1:20;
Lc = 1; output = sqrt(1./Re1)*Lc;
plot(Re1,output),axis([0 10 0 10])