How to make data-dependent plot symbols?
in [Matlab]
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From: Aram on 21 Apr 2010 12:26 Good morning. Suppose I have a table of data with multiple columns. The first column has X values, and the second (say) has Y values to be plotted against X. The remaining columns have other data associated with X, but I'm not going to plot those. Now suppose I want to plot X against Y, but I want the markers to vary in shape, color, or some other visible characteristic depending on the values of data in columns that I am not plotting. Now granted, I could write a series of loops to parse the data array into smaller arrays, and plot each. But that's a lot of work, and it would be more compact and readable if I could use the other data columns parametrically to set marker characteristics. I'm still fairly new to Matlab, but as a long-time Mathematica user, this is a fairly common thing to do. Is it straightforward in Matlab? Thanks, my searches have come up short. Oh yeah. Ideally, I could create a legend containing each symbol type, even though only only y-series is being plotted. Appreciate any help I can get... Aram : )
From: us on 21 Apr 2010 12:52 "Aram " <tkdawacs_removeme_(a)yahoo.com> wrote in message <hqn8us$5hf$1(a)fred.mathworks.com>... > Good morning. Suppose I have a table of data with multiple columns. The first column has X values, and the second (say) has Y values to be plotted against X. The remaining columns have other data associated with X, but I'm not going to plot those. > > Now suppose I want to plot X against Y, but I want the markers to vary in shape, color, or some other visible characteristic depending on the values of data in columns that I am not plotting. Now granted, I could write a series of loops to parse the data array into smaller arrays, and plot each. But that's a lot of work, and it would be more compact and readable if I could use the other data columns parametrically to set marker characteristics. > > I'm still fairly new to Matlab, but as a long-time Mathematica user, this is a fairly common thing to do. Is it straightforward in Matlab? Thanks, my searches have come up short. > > Oh yeah. Ideally, I could create a legend containing each symbol type, even though only only y-series is being plotted. > > Appreciate any help I can get... > > Aram : ) well... there's not a ML stock function, which does what you want, and, as you said, you'd have to write a loop... however, the code for such a loop is very simple to write in ML, especially if you use one of the columns as a grouping index... us
From: Steven Lord on 21 Apr 2010 13:42 "Aram " <tkdawacs_removeme_(a)yahoo.com> wrote in message news:hqn8us$5hf$1(a)fred.mathworks.com... > Good morning. Suppose I have a table of data with multiple columns. The > first column has X values, and the second (say) has Y values to be plotted > against X. The remaining columns have other data associated with X, but > I'm not going to plot those. > > Now suppose I want to plot X against Y, but I want the markers to vary in > shape, color, or some other visible characteristic depending on the values > of data in columns that I am not plotting. Now granted, I could write a > series of loops to parse the data array into smaller arrays, and plot > each. But that's a lot of work, and it would be more compact and readable > if I could use the other data columns parametrically to set marker > characteristics. > > I'm still fairly new to Matlab, but as a long-time Mathematica user, this > is a fairly common thing to do. Is it straightforward in Matlab? Thanks, > my searches have come up short. > > Oh yeah. Ideally, I could create a legend containing each symbol type, > even though only only y-series is being plotted. Varying in color is easy -- SCATTER. Varying in marker shape is a little trickier, though I believe you can still do it using SCATTER and modifying a property of the object whose handle is returned. -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
From: Bjorn Gustavsson on 21 Apr 2010 16:24 "us " <us(a)neurol.unizh.ch> wrote in message <hqne04$gbk$1(a)fred.mathworks.com>... > [major snip] > > yes, SCATTER... > if(f) the OP does not want to connect the data by lines with different attributes as well... > > us > For plotting a curve that varies in colour there is 2-3 functions on the file exchange that gets the work done. Two are called cline (or if it was cplot, one of them I've used with sattisfactory results). HTH, Bjoern
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