Help me about plot and linspace in matlab ?

for example I plot the graph y = 2/x by plot command :

x = linspace(1,10,100);
y = 2./x;
plot(x,y,'linewidth',4,'color','r')

It run normally and doesn't have error. But now I plot the graph y = (2/x)^3 by plot:

x = linspace(1,10,100);
y = (2./x)^3;
plot(x,y,'linewidth',4,'color','r')

It appear the error : ??? Error using ==> mpower Inputs must be a scalar and a square matrix. Help me fix it. I think I put the dot wrong. thanks very much.

Answer 1

[Azzi Abdelmalek]

It should be

x = linspace(1,10,100);
y = (2./x).^3;
plot(x,y,'linewidth',4,'color','r')

[Nguyen Trong Nhan]

Why I have to that without y = (2./x)^3 .

[Azzi Abdelmalek]

If x=[1 2 3] , x^3 is not possible, what you need is x.^3, operation element by element

[Nguyen Trong Nhan]

Ok, I see. thanks you very much.