MATLAB: Plot only for positive y

MATLABplot

I have
      plot(x,y)
      hold on
      plot(x,z)
      hold on
      plot(x,w)
I need to have a plot for only positive y and z. I try to write
ylim([0,yMax])
But I do not know how to set for yMax. Please advise.

Best Answer

 NEW ANSWER
 ylim([0 inf])  %Will automatically compute the limit where "inf" is used
 OLD ANSWER
 ylim([0, max([y(:); z(:); w(:)]))
 %will plot positive values of y axis from 0 to the maximum of either your y or z or w values.
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