the use of ezplot function

Would you please explain the use of ezplot function. Why it is giving a warning in this case? Thanks

>> d

d =

    'x^2 –6*x – 12'

>> ezplot(d)
Error using inlineeval (line 14)
Error in inline expression ==> x.^2 –6.*x – 12
 Error: The input character is not valid in MATLAB statements or expressions.

Error in inline/feval (line 33)
        INLINE_OUT_ = inlineeval(INLINE_INPUTS_, INLINE_OBJ_.inputExpr, INLINE_OBJ_.expr);

Error in ezplotfeval (line 51)
    z = feval(f,x(1));

Error in ezplot>ezplot1 (line 482)
    [y, f, loopflag] = ezplotfeval(f, x);

Error in ezplot (line 154)
                [hp, cax] = ezplot1(cax, f{1}, vars, labels, args{:});

Answer 1

[Star Strider]

You need to use the (-) sign, not char(8211) for the minus sign.

Also, character arrays are no longer usable with the Symbolic Math Toolbox.

Try this instead:

syms x 
d = x^2 - 6*x - 12;

figure
ezplot(d)

figure
fplot(d)

Bothe of these work with your function.

[Star Strider]

The ezplot and fplot functions are slightly diffrerent.

I want to introduce you to fplot because ezplot will likely be depricated (no longer supported) in the not distant future.

Answer 2

[metin yilmaz]

But what is the diffence between

syms x 
d = x^2 - 6*x - 12;
figure
ezplot(d)

and

syms x 
d = x^2 - 6*x - 12;
figure
ezplot(d)
figure
fplot(d)

?

Thank you.