how to find max and min values of the plot

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captainmariah
captainmariah 2016-7-21
评论： captainmariah 2016-7-22
Hi,
Im plotting some data and I want to separate sections with colours. I am doing that with 'patch' but i want it to fill to maximal and minimal value of the plot window, for a section of the x-axis that I choose. My code:
figure; hold on;
I1 = power(7000:end);
t1 = time(7000:end);
plot(t1,I1,'.'); grid;
time1 = '15:48:30';
time2 = '15:51:30';
p=patch([datenum(time1,'HH:MM:SS') datenum(time2,'HH:MM:SS') ...
datenum(time2,'HH:MM:SS') datenum(time1,'HH:MM:SS')],...
[0.06 0.06 0.105 0.105],'r'); % x, Y coord
set(p,'FaceAlpha',0.1);
I don't want to enter these numbers manually. How can it find the max and min the plot with plot the data with and automatically size the patch to fill along the y-axis for entered x values?

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回答（1 个）

Guillaume
Guillaume 2016-7-21
You can get the axis range from its XLim and YLim properties, which you can query with either get(gca, 'YLim') or simply ylim:
p = patch([datenum(time1,'HH:MM:SS') datenum(time2,'HH:MM:SS') ...
datenum(time2,'HH:MM:SS') datenum(time1,'HH:MM:SS')],...
reshape([ylim; ylim], 1, []),'r');
  1 个评论
captainmariah
captainmariah 2016-7-22
Hi, Im getting the following error when using this code: reshape([ylim; ylim], 1, []),'r');
Error: File: processdata.m Line: 46 Column: 48 Expression or statement is incorrect--possibly unbalanced (, {, or [.

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