Re: plotting even function

[Steve C. Thompson]

John,

Could this be it?

  x^(2/3) is equal to (x^(1/3))^2 which isn't even.

  x^(2/3) is not equal to (x^2)^(1/3) which is even.


Steve


On Mar 19 16:20PM, John B. Thoo wrote:
> Hi.  I hope that I'm not embarrassing myself by asking the following.
> 
> I believe that
> 
>        3       2/3    1
>   y = --- (2 x)    + ---
>        4              2
> 
> is an even function, yet
> 
> x = -1:0.04:1;
> plot (x, 0.75 * (2 .* x).^(2 / 3) + 0.5)
> 
> is not symmetrical about the y-axis.  What is wrong with my thinking?
> 
> TIA.
> ---John.
> 
> 
> 
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