Path: news.mathworks.com!not-for-mail From: "Sadik " <sadik.hava@gmail.com> Newsgroups: comp.soft-sys.matlab Subject: Re: Double Numerical Integration Date: Wed, 14 Jan 2009 17:31:01 +0000 (UTC) Organization: The MathWorks, Inc. Lines: 12 Message-ID: <gkl7gl$lu0$1@fred.mathworks.com> References: <gkl6sh$97r$1@fred.mathworks.com> Reply-To: "Sadik " <sadik.hava@gmail.com> NNTP-Posting-Host: webapp-02-blr.mathworks.com Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit X-Trace: fred.mathworks.com 1231954261 22464 172.30.248.37 (14 Jan 2009 17:31:01 GMT) X-Complaints-To: news@mathworks.com NNTP-Posting-Date: Wed, 14 Jan 2009 17:31:01 +0000 (UTC) X-Newsreader: MATLAB Central Newsreader 1666517 Xref: news.mathworks.com comp.soft-sys.matlab:511519 "V" <javiar@rediffmail.com> wrote in message <gkl6sh$97r$1@fred.mathworks.com>... > Hi All, > I am trying to numerically evaluate a double integral function, z = f(x,y) over the limits (0,75000). The typical values of z are in the range 0 to 10^5. So the volume calculated under the surface plot is very large. This integration step takes several minutes (typically 15-20 mins) but when the step is repeated 75 times (for varying limits - still in 10^3 units), the whole process can take several hours to complete. > I am wondering if anyone knows of a simpler way of solving the problem which takes large limits that takes reasonable to solve as opposed to the current time of a few hours. > > Cheers... Hello V, :) I believe the answer to your question depends on your function f(x,y). Could you give a few more details about it? Thanks.