### ploting problems

I want to do the plot of: log (y) vs log (x), when y = log (x) and x is between (1,150), so I tried:

sage: var ('x,y')
(x, y)
sage: y = function ('y',x)
sage: y = x^2
sage: plot (log(y), (log(x), 1,150))

but the final result that I found is wrong (I did the real plot using openoffice and gnuplot), so finally someone could you help me to solve this problem?