Non numeric data X plot

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Tiago Araujo
Tiago Araujo on 17 Apr 2021
Commented: Tiago Araujo on 19 Apr 2021
I need help to solve this plot:
syms X L
X = 0:L/16:L;
Y = 1 + 2*X;
plot (X,Y);
This is just an example, the function I am trying to solve is a bit complicated.

Accepted Answer

Walter Roberson
Walter Roberson on 17 Apr 2021
In this particular case, you can plot something meaningful. In most cases, you cannot plot with unresolved symbolic variables unless you use fplot() or fplot3() or fsurf() to have MATLAB automatically substitute specific numeric values for the unresolved values.
You cannot, for example, plot a family of curves expecting it to show you abstract curves such as "s", "s/2", "s/4", "3s/2" and so on. Plotting always requires that something replaces all symbolic variables with particular numeric values.
syms X L
X = 0:L/16:L;
Y = 1 + 2*X;
fplot3(L, X, Y, [0 20]); xlabel('L'); ylabel('X'); zlabel('Y');
  5 Comments
Walter Roberson
Walter Roberson on 18 Apr 2021
Edited: Walter Roberson on 18 Apr 2021
syms X L
X = 0:L/16:L;
for i=1:length(X)
Y(i) = 1 + 2*(X(i)/L);
end
figure
plot(X/L, Y);
xticklabels(string(sym(xticks)) + " L")
Tiago Araujo
Tiago Araujo on 19 Apr 2021
Great man, you are great!!!
THANKS!

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