I'm trying to plot a function with ez plot where my variable x is a symbolic object and I would like to make the boundaries of my plot symbolic objects also. I'm new to matlab

syms c l u x

f =

(c+1)^3*x^5-3*(c+1)^4*x^4+((c+1)^2*l+u+3*(c+1)^5)*x^3-(2*(c+1)^3*l+(3*c+3)*u+(c+1)^6)*x^2+(3*(c+1)^2*u+(c+1)^4*l)*x

this is my function and when I try to plot it using ezplot

this is what I get: ezplot(f) ??? Error using ==> char Cell elements must be character arrays.

Error in ==> ezplot at 158 fmsg = char(f);

Error in ==> sym.ezplot at 46 h = ezplot(f.s);

I don't understand what this means. Can someone help me plot this function please

[Christopher Creutzig]

I get “Error using sym/ezplot (line 45) The number of variables must not exceed two when plotting an equation.” Which makes sense.

[RahulTandon]

the error message that i get is : ezplot cannot have more than two variable and you have four!!!

Answer 1

[Walter Roberson]

The boundaries for ezplot and related functions cannot be symbolic; they must be numeric values. You can plot with numeric values and change the xticklabel and yticklabel to show symbols.