Plotting with a symbolic expression

Hi,

I have a symbolic expression kappa and I am sweeping a variable omega from -4*kappa to 4*kappa. What I want to do is get a plot whose x axis corresponds to omega. In other words my x axis should go from -4 to 4 and the unit should be kappa. When I try to plot I am getting the following error:

Error using plot Conversion to double from sym is not possible.

Error in eqn_1 (line 55) plot(omega_f(:),trans(:))

Thanks in advance.

[Sean de Wolski]

Please provide a full minimal working example.

Answer 1

[Walter Roberson]

That is not possible. The plotting functions need specific numeric data to work with. You can substitute in 1 for kappa and plot that way and then change the xticklabel . And the datacursormode callback if that's important to you.

[Kivanc Bugan]

How about ezplot? Would it work?

[Walter Roberson]

No. See http://www.mathworks.com/help/symbolic/ezplot.html and notice that if you do not specify a range then ranges will be assumed for both variables, and if you do specify a range then the range will be used for both variables. There is no provision to keep one of the variables symbolic.