% HISTOGRAM: Keyword parameter NAN not allowed in call to: HISTOGRAM
This parameter is used, for example, by HIST_EQUAL IDL procedure. In
HISTOGRAM has a green color, so maybe this KEYWORD has been not noticed by anyone yet.
thanks for the report. I will see if we can improve it. At the beginning, the green was only to say that the main feature of a pro/func was available, and you have to click on the GDL key (column 2) to look at the keywords really available, sorry.
I also would like to mention that, as a very old user of IDL, new keywords are added, releases after releases (e.g.: NaN were delivered for a large of pro/func, /center for FFT) but I did not notice because they did not exist years ago …
We need feedback for such "tricks"
A preliminary version of /Nan is now in the CVS for HISTOGRAM. It did work on some basic cases I tested. I am not sure to have saw all the side effects, don't hesitate to post pbs (with simple codes please).
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