Asked by Brad
on 15 May 2013

I’m searching for a method to plot groups of data on a scatter plot. I thought I found a way on the MATLAB Documentation Center (small car example is very similar to what I’m hoping to do).

Unfortunately, my work center doesn’t have the Statistics Toolbox containing the gscatter command.

To make matters more interesting, the groups of data are dynamic, changing from one set to the next.

Does anyone aware of such a method in MATLAB?

Answer by per isakson
on 16 May 2013

Edited by per isakson
on 16 May 2013

Accepted answer

*"small car example"* is this what you refer to?

load carsmall gscatter(Weight,MPG,Model_Year,'','xos')

*"annotate a group"* I don't understand what you mean. `gscatter` does not have an *annotate* option, or does it?

When posing a question try to make it simple to answer.

.

Something similar to the carsmall plot can be created with

plot( x1, y1, ... ) hold on plot( x2, y2, ... ) plot( x3, y3, ... ) legend( ..... )

The two subsequent plots might(?) change the range of the axes. My way of fixing that is

axh = gca; set( axh, 'Xlim', [0,2] ) set( axh, 'Ylim', [0,2] )

However, there is a special command

xlim([xmin,xmax])

which operates on the current axes.

.

There is also a low level way:

- create an axes (handle graphic ) object
- create three line objects, which are children to the axes
- ...

Answer by per isakson
on 15 May 2013

Did you search the File Exchange? Generate Data for Clustering

per isakson
on 16 May 2013

IMO:

- with Matlab one typically achieves a result with a code that contains several lines or more
- the File Echange is a great source of ideas (and ready made solutions)
- browsing the File Exchange is worth while

The contribution I picked does not deliver what the picture promises. However, there might be others.

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