#117 Control plotting of specific data points
Often you have data points which you know are not valid for some reason and would like to exclude them from a plot. The only way I know of to do this is to edit the data file, but it can be much more difficult to distinguish those points when looking at numbers than when looking at a graph. I propose a way to exclude specific points from within Gnuplot. I imagine a new keyword such as "except" which takes a list of record numbers to exclude, unlike the "every" keyword which can only exclude data at regular intervals.
Then, the feature that would _really_ make this useful would be to have a mouse command that adds points to this list. For example, click the mouse to exclude the point nearest the cursor, or draw a box and exclude all points inside it.
Logged In: YES
user_id=235620
The example you request is already possible. Please see the
"mousevariables" demo for an example of how to obtain
coordinates using the mouse. Let us assume that you have
used the mouse to obtain the corners of an exclusion
rectangle X1,Y1,X2,Y2. Then you replot the data excluding
all points in this region using a command sequence such as:
exclude(x,y) = (x > X1 && x < X2 && y > Y1 && y < Y2) ? 1 : 0
plot "data" using ($1) : (exclude($1,$2) ? 1/0 : $2) with
points
Logged In: YES
user_id=1122417
This is very clever, and I thank you for taking the time to
show how to do it. The only additional thing one might want
would be multiple excluded areas, or irregularly shaped
areas. Now that I have read your method, I'll see if I can
make that work, too.
Logged In: YES
user_id=235620
I'm closing this one, since the basic functionality is
already present. I think all the fancy variants you mention
can be handled in a loadable script without requiring any
new program features.