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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by RaiKna[/i] [br]Hello to all! Hope someone can help me with this mathematical problem. I have about 1 Mln data records wich represent telephone calls. Each record gives me the date, start time, duration and end time of a call. I would like to plot a graph wich shows me the number of simultaneous telephone calls (Y axis) distributed over the time of day (X axis). Everey suggestion is appreciated. Thanks! Rainer [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.