Color Scatter plot based on values in another column

I have a .csv file with some columns of data. I want to scatter plot 2 columns X and Y, with colors based on their respective values in colimn Z.

These are the groupings for coloring:-

0.5-1.5

1.5-2.0

2.0-2.5

2.5-3.0

3.0-3.5

>3.5

I also want to know how the code will change with the number of groupings. I would also like to know how to create a legend with color and the range and a trendline for the graph.

Answer 1

[dpb]

You can't use such a grouping as is, create a grouping variable...

edges=[0.5 1.5:0.5:3.5 inf];
g=discretize(Z);
hSC=scatter(X,Y,[],g);

I illustrated the idea of a legend correlated with color just yesterday -- the legend is associated with an object handle, not a property, so you'll have to supply a color for each bin -- the <example> used a fixed color for each scatter object instead so it needed the RGB triplet form instead of being able to use the indexing into a colormap, but the code logic is the same idea as there.