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Is there a way to create and annotate a group scatter plot, without using the gscatter command?

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?

0 Comments

Brad

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2 Answers

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
  • ...

0 Comments

per isakson
Answer by per isakson on 15 May 2013

Did you search the File Exchange? Generate Data for Clustering

2 Comments

Brad on 16 May 2013

Per, I did take a look at this. The data I am working with is already generated in groups based on a specific ID for multiple platforms. So Nuno's function won't quite work.

Looks like I will be spec'ing out the Statistics Toolbox.

Thanks for pointing me in this direction.

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.

per isakson

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