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Re: xref-find-matches and stuff

From: Helmut Eller
Subject: Re: xref-find-matches and stuff
Date: Sat, 09 May 2015 11:06:45 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

On Sat, May 09 2015, Eli Zaretskii wrote:

> Back-ends that mis symbols make no sense, IMO.  They should be fixed
> not to miss them.

There are many situations where it's desirable to show fewer than more
symbols; irrelevant symbols should be filtered out.  In other words:
most people prefer high Precision[*] over high Recall[*].  Ideally we
would like to have both high Precision and high Recall, but in practice
a trade-off is needed.  E.g. the etags backend has relatively high
Recall but very low Precision.  IMO a bad trade-off compared to the much
better Precision of the elisp/find-func backend.

Also I think that the generic/naive merging of backends as proposed so
far will (always?) increase Recall but usually decrease Precision.



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