the use of ezplot function

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metin yilmaz
metin yilmaz 2020-11-7
评论： Star Strider 2020-11-7
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{:});

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回答（2 个）

Star Strider
Star Strider 2020-11-7
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.
  1 个评论
Star Strider
Star Strider 2020-11-7
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.

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metin yilmaz
metin yilmaz 2020-11-7
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.

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