scatter plotting color coded

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shobhit mehrotra
shobhit mehrotra 2014-7-17
编辑： Alfonso Nieto-Castanon 2014-7-18
I have question regarding creating a scatter plot with three variables (lat, lon, ch4). They are all vectors of the same length. I want to plot lon and lat on the x and y axis and show ch4 color coded.
attached is an image of what im trying to create
Thanks!
  2 个评论
Sara
Sara 2014-7-17
What do you want to know? How to select only certain indexes in an array like:
index = 12000:34000;
scatter(lat(index), lon(index),[],ch4(index))
or how to find index?
shobhit mehrotra
shobhit mehrotra 2014-7-17
I want to know how to create a color coded scatter plot, with lat and lon on the axis and ch4 on the spectrum. Thanks

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回答（2 个）

Image Analyst
Image Analyst 2014-7-18
Use scatter() - with that function you can control the color and size of every marker.
Alfonso Nieto-Castanon
编辑：Alfonso Nieto-Castanon 2014-7-18
perhaps something along these lines:
% your data (assuming column vectors)
lat = convn(randn(1e3,1),hanning(100));
lon = convn(randn(1e3,1),hanning(100));
ch = convn(randn(1e3,1),hanning(100));
% plot one line for each pair of consecutive points
h = plot([lat(1:end-1) lat(2:end)]',[lon(1:end-1) lon(2:end)]','-');
% decide the color of each line
cmap = jet(128);
color = convn(ch,[1;1],'valid');
color = (color-min(color))/(max(color)-min(color));
color = cmap(round(1+color*127),:);
% assign colors
for n = 1:numel(h),
set(h(n),'color',color(n,:));
end
You could get more sophisticated and use patches instead of lines (this works better when your points are far apart because it allows you to smoothly interpolate the color between two points), or simpler and plot individual dots instead of lines (this works just fine if your points are very close and do not have to worry about connecting the points) depending on your particular dataset.

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