How to make brush ignore certain variables

Hi there,

I am required to manually filter a large amount of data over multiple years. I would like to plot two variables at once, the "raw" data in red, then the "clean" data in blue. I would like to be able to modify the "clean" data with the brush tool without modifying the "raw" data (so that any changes I make are clearly visible). For example:

%imagine 

x = 1:5;
y_raw = rand(5,1)
y_clean = y_raw 

%notice the "clean" and "raw" data are the same initially, 
%I would like to overlay them and use the brush tool to manually remove outliers
%from the "clean" variable, then save the new "clean" points. 

plot(x,y_raw,'-or')
hold on 
plot(x,y_clean,'-ob')

brush on

Afterwards, I would save the clean values with "save y_clean.mat y_clean"

The brush works on the "clean" blue variables if I only select one point at a time. However, I want to select many points at once by clicking and dragging the brush over the plot. Unfortuntely, this selects all the data and not just the top y_clean (blue) values. I have tried this:

a = plot(x,y_raw,'-or')
hold on
b = plot(x,y_clean,'-ob')

brush(a,'on')

but no luck. Thanks a ton!

-Devon