Creating a series of x-y plots

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Lin
Lin 2014-9-29
评论： Image Analyst 2014-10-3
Hey, I want to make a set of x-y plots based on data with the following format:
"Tag Property-A Property-B
X1 A11 B11
X1 A12 B12
...........................
X2 A21 B21
..........................."
Properties A and B are the x and y variables. Each tag is matched with several pairs of A and B, and each plot should include data with a specific tag. Since there are a good many tags, it is impossible to manually separate the data. So is there any commands in Matlab that can be used to create such plots? I hope I have clearly stated my question. Thanks. Lin
P.S. I just realized the format couldn't display properly, so I'll briefly describe the data: there are three columns of data: Tag, Property A, Property B. Each tag encompasses a certain amount of x-y pairs, and the purpose is to make every one of the tags a plot showing the scattered x-y relationship.
A sample data file is attached.
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Lin
Lin 2014-9-29
Thanks. This is helpful. I'm still trying to get a hang of the formatting rules here.

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采纳的回答

Chad Greene
Chad Greene 2014-9-29
If you have three columns, call them station, depth, and salinity, you could plot all the station 1 data as red pentograms, station 2 as blue squares, etc, like this:
plot(salinity(station==1),depth(station==1),'rp-');
hold on
plot(salinity(station==2),depth(station==2),'bs-');
plot(salinity(station==3),depth(station==3),'mo-');
plot(salinity(station==4),depth(station==4),'k^-');
plot(salinity(station==5),depth(station==5),'gx-');
legend('station 1','station 2','station 3','station 4',...
'station 5','location','southwest')
legend boxoff
box off
ylabel('depth (m)')
xlabel('salinity (psu??)')
set(gca,'ydir','reverse')
axis tight
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Chad Greene
Chad Greene 2014-9-30
Don't manually type plot lines 70 stations! If you want to do all of them on the same plot, this would work:
stationColors = jet(70); % creates 70 colors;
hold on;
for k = 1:70
plot(salinity(station==k),depth(station==k),...
'.-','color',stationColors(k,:));
end
box off
ylabel('depth (m)')
xlabel('salinity (psu??)')
set(gca,'ydir','reverse')
axis tight
Similarly, you could skip the loop and use scatter. You could even make the colors reflect something physically meaningful, rather than simply the station number. The profiles could be colored by latitude, or distance from the center of some gyre, or whatever interesting variable you're investigating.
If you only want to plot a single station, say, station number 15, you could use the example above like this:
k = 15; % <-- enter station number here
plot(salinity(station==k),depth(station==k),...
'.-','color',stationColors(k,:));
box off
ylabel('depth (m)')
xlabel('salinity (psu??)')
set(gca,'ydir','reverse')
axis tight
Lin
Lin 2014-10-3
Thanks dude! I guess I can pretty much figure it out now. REALLY appreciate it!

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Image Analyst
Image Analyst 2014-9-29
Just use readtable
t = readtable(xlsFullFileName);
Then extract the columns, use unique() to find unique tag names, then use logical indexing in a loop to extract rows for each tag in turn and plot. Let us know if you can't figure it out. Sorry, but I have to run off somewhere now.
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Lin
Lin 2014-10-3
OK, I think I get the point. I may need to dig it a little more later on, as I haven't figured out the commands to query the columns with a certain tag. But it's OK since I've done with the work by doing it manually. Thanks for the information anyway.

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