New transformations to locate data values (extending `@LOC`)

[karlmsmith]

Reported by steven.c.hankin on 20 Nov 2003 00:42 UTC The transformation @LOC finds "crossing" locations. It returns the world coordinate that corresponds to the point where a piecewise continuous function hits a particular value. But some types of data are inherently not continuous -

• discrete functions. For these functions we want a transformation that will locate the coordinate (or index?) where the value is matched exactly. Also, in many cases we want to know the index, rather than the coordinate value.

Suggested enhancements: yes? LIST v[i=@cloc:val] -- renamed version of the current "loc" -- old name "@LOC" deprecated yes? LIST v[i=@iloc:val] -- returns the fractional index, rather than the coordinate yes? LIST v[i=@cxpt:val] -- "coordinate of exact point" -- returns the coordinate at which the exact value match first occurs yes? LIST v[i=@ixpt:val] -- "index of exact point" -- returns the index at which the exact value match first occurs

yes? LIST v[i=i

Migrated-From: http://dunkel.pmel.noaa.gov/trac/ferret/ticket/725

[karlmsmith]

Comment by steven.c.hankin on 20 Nov 2003 20:43 UTC better (simpler) transform names might be @IPT and @CPT (dropping the "X") -- the idea is to locate the point (pt) where the given value occurs.

[karlmsmith]

Comment by @AnsleyManke on 2 Dec 2003 22:03 UTC Move to Ferret Tasks

[karlmsmith]

Comment by @AnsleyManke on 5 Nov 2004 19:19 UTC Changing Component of bugs in "Ferret Tasks" from All to Main