Best way to graph a discontinuous data set?
| gseaborn | August 29, 2008 - 12:49 | ||
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I have a numeric data set that is interspersed with "-1" values. Wherever there is a "-1", I would like the graph not to plot the point, and to make a gap between the two adjacent points (not join them up). Is there any easy way to do this? I know I can use DeletePoints to remove the points that have a value of "-1", but I'm not sure how I can make it so that the line graph is plotted discontinuously. Thanks |
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Joined: 2007-03-01
Location: United States
Igor plots a gap where the value of a wave is NaN (not a number), so you just need to replace all -1 values in your wave with NaN and then display the wave.
Something like:
foo = foo[p] == -1 ? NaN : foo[p]
should work for the replacement.
Joined: 2008-08-01
Location: Canada
Thanks - that's perfect.
Joined: 2008-07-08
Location: United States
aclight, where can I learn more about the syntax that you used? That functionality looks interesting, but I don't follow it.
Joined: 2007-09-12
Location: Australia
It's in the IGOR help browser. Look for ?: in the index.
On the LHS you have a "True or false" question.
Part 1:
foo[p]==-1? which points in foo are equal to -1?
Part 2:
foo= ....... NaN : foo[p]
where the question in part 1 equates to True, set the value of foo to NaN. Where the question equates to False, leave the point as it is.
Something like:
foo = foo[p] == -1 ? NaN : foo[p]
should work for the replacement.