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remove.pro


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remove, index, v1, v2, v3, v4, v5, v6, v7

NAME: REMOVE PURPOSE: Contract a vector or up to 7 vectors by removing specified elements CALLING SEQUENCE: REMOVE, index, v1,[ v2, v3, v4, v5, v6, v7] INPUTS: INDEX - scalar or vector giving the index number of elements to be removed from vectors. Duplicate entries in index are ignored. An error will occur if one attempts to remove all the elements of a vector. INPUT-OUTPUT: v1 - Vector or array. Elements specifed by INDEX will be removed from v1. Upon return v1 will contain N fewer elements, where N is the number of values in INDEX. OPTIONAL INPUT-OUTPUTS: v2,v3,...v7 - additional vectors containing the same number of elements as v1. These will be contracted in the same manner as v1. EXAMPLES: (1) If INDEX = [2,4,6,4] and V = [1,3,4,3,2,5,7,3] then after the call IDL> remove,index,v V will contain the values [1,3,3,5,3] (2) Suppose one has a wavelength vector W, and three associated flux vectors F1, F2, and F3. Remove all points where a quality vector, EPS is negative IDL> bad = where( EPS LT 0, Nbad) IDL> if Nbad GT 0 then remove, bad, w, f1, f2, f3 METHOD: If more than one element is to be removed, then HISTOGRAM is used to generate a 'keep' subscripting vector. To minimize the length of the subscripting vector, it is only computed between the minimum and maximum values of the index. Therefore, the slowest case of REMOVE is when both the first and last element are removed. REVISION HISTORY: Written W. Landsman ST Systems Co. April 28, 1988 Cleaned up code W. Landsman September, 1992 Major rewrite for improved speed W. Landsman April 2000

Parameters

index
v1
v2
v3
v4
v5
v6
v7

File attributes

Modification date: Tue Oct 1 14:16:37 2013
Lines: 167