Plot only for positive y

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alpedhuez
alpedhuez 2018-6-12
评论： Jack 2023-5-14
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.
  2 个评论
OCDER
OCDER 2018-6-12
编辑：OCDER 2018-6-12
ylim([0,max(y)])
?
Curious, why do you have to plot(x, z) twice? Also, do you want to plot the maximum of y or z?
ylim([0, max([y(:); z(:)]))
alpedhuez
alpedhuez 2018-6-12
I have sought a simpler way to specify Y axis so that the figure only shows positive part of the Y-axis.

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OCDER
OCDER 2018-6-12
编辑：OCDER 2018-6-13
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.
  3 个评论
显示 1更早的评论
OCDER
OCDER 2018-6-13
Actually, there was an easier solution. I'll update the answer:
ylim([0 inf]) %will automatically compute the limit where "inf" is used
https://www.mathworks.com/help/matlab/ref/ylim.html#buob47u-limits
Jack
Jack 2023-5-14
this doesnt seem to work on my graph bit confused any ideas how I could be messing it up? im putting it after the plot(x,y) and have tried after title labels and after hold on so bit confused.

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