Plotting with a symbolic expression

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Kivanc Bugan
Kivanc Bugan 2015-7-2
评论： Walter Roberson 2015-7-3
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.

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回答（1 个）

Walter Roberson
Walter Roberson 2015-7-2
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.
  2 个评论
Walter Roberson
Walter Roberson 2015-7-3
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.

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