[ADMB Users] extraction of array elements using selection logic

[Fowler, Mark]

I'm looking for an ADMB form of  R-style logical selection from arrays.
Ignore if this should be regarded as just a C programming question and
shouldn't be here.

I currently use a bulky loop-based method to accomplish this, looking
for something more efficient. For example say I have a matrix BEFORE of
index and value columns and I want to remove rows with values of zero to
obtain matrix AFTER. Anybody know how to do this in a few lines without
looping? 

	BEFORE			AFTER
1 	34.58641 		1 	34.58641 	
2 	0 		3 	42.54367 	
3 	42.54367 		4 	46.27856 	
4 	46.27856 		5 	49.85982 	
5 	49.85982 		6 	53.29379 	
6 	53.29379 		7 	56.58652 	
7 	56.58652 		8 	59.74382 	
8 	59.74382 		9 	62.77126 	
9 	62.77126 		10 	65.67418 	
10 	65.67418 				


		Mark Fowler
		Population Ecology Division
		Bedford Inst of Oceanography
		Dept Fisheries & Oceans
		Dartmouth NS Canada
		B2Y 4A2
		Tel. (902) 426-3529
		Fax (902) 426-9710
		Email Mark.Fowler at dfo-mpo.gc.ca
		Home Tel. (902) 461-0708
		Home Email mark.fowler at ns.sympatico.ca


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