MATLAB: Help me about plot and linspace in matlab

plot

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.

Best Answer

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