Trouble with using plot because of wrong data type

Question

Minh Hoang 2024-3-7

0
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https://ww2.mathworks.cn/matlabcentral/answers/2091731-trouble-with-using-plot-because-of-wrong-data-type

回答： Mathieu NOE 2024-3-7

I am trying to plot the hydrogen radial probability by just simply using plot and inserting manually the wave function. Here is my code:

syms r
a0 = 0.529177 * 10^(-10); %Bohr radius
R = 2*(1/2*a0)^(3/2)*exp(-r/a0); %wave function for n = 1, l = 0 
line = (r^2)*(R^2); %corresponding radial probability
plot(r/a0,line) %I am trying to scale the plot in units of Bohr radius 𝑎0
Error using plot
Data must be numeric, datetime, duration, categorical, or an array convertible to double.

However, the system tells me that my data is not one of the types that can be used in plot. Could anyone help me point out how to fix this? Thanks a lot!