Dear R-users, On behalf of my colleague I would like to ask you for a help: I have to produce a 3D graphs from several two-column files. Each file has around 20-30k of lines. EXAMPLE OF TWO_COLUMNS_FILE - col_names:(EPS, UPS) 8 725 8 825 3 1025 10 9950 9 10000 8 10350 8 10500 10 6950 3 1000 7 11125 5 11200 5 11425 10 7050 2 950 5 11775 10 7100 4 400 3 900 3 400 6 12325 9 7250 4 625 4 575 3 550 3 325 Histograms for EPS bins (2,5,10)[=>X-axis] which are nested in histogram of UPS bins (500,1000,5000)[=>Y-axis]. The Z-axis values are the number of occurences of the binned pairs. Need to process large amount of these files (no fixed number of rows). Endproduct 3D histograms for each file (see example here: ftp://ftplmu.jrc.it/outgoing/rado/histo.JPG) I proceeded like this, but maybe there are already utilities that can handle something like that: Sort for UPS: 3 325 4 400 3 400 3 550 4 575 4 625 8 725 8 825 3 900 2 950 3 1000 3 1025 10 6950 10 7050 10 7100 9 7250 10 9950 9 10000 8 10350 8 10500 7 11125 5 11200 5 11425 5 11775 6 12325 Histogram: 1st bin UPS(0<y<500) 3 325 4 400 3 400 = 3 in EPS bin(2<x<5) ; 0 in all other EPS bins => Z values 2nd bin UPS(500<y<1000) 3 550 4 575 4 625 8 725 8 825 3 900 2 950 = 1 in EPS bin(0<x<2) ; 4 in EPS bin(2<x<5) ; 2 in EPS bin(5<x<10) => Z values Thanks in advance, Rado (for Jens) -- Radoslav Bonk Ph.D European Commission - DG Joint Research Centre (JRC) Institute of Environment and Sustainability (IES) LM Unit - Natural Hazards Via E. Fermi, TP 261, 210 20 Ispra (VA), ITALY tel: 0039 0332 78 6013 fax: 0039 0332 78 6653 http://natural-hazards.jrc.it/floods