Path: news.mathworks.com!not-for-mail From: "John D'Errico" <woodchips@rochester.rr.com> Newsgroups: comp.soft-sys.matlab Subject: Re: root (cube, 4th, nth) Date: Thu, 18 Feb 2010 15:15:09 +0000 (UTC) Organization: John D'Errico (1-3LEW5R) Lines: 38 Message-ID: <hljlht$jc8$1@fred.mathworks.com> References: <hljkjs$i04$1@fred.mathworks.com> Reply-To: "John D'Errico" <woodchips@rochester.rr.com> NNTP-Posting-Host: webapp-05-blr.mathworks.com Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Trace: fred.mathworks.com 1266506109 19848 172.30.248.35 (18 Feb 2010 15:15:09 GMT) X-Complaints-To: news@mathworks.com NNTP-Posting-Date: Thu, 18 Feb 2010 15:15:09 +0000 (UTC) X-Newsreader: MATLAB Central Newsreader 869215 Xref: news.mathworks.com comp.soft-sys.matlab:609300 "Riyman " <r_iman_2008@hotmail.com> wrote in message <hljkjs$i04$1@fred.mathworks.com>... > Hi, > > what are the commands to find: > cube root, > 4th root > nth root > > Thanks for your help, > R. The trick here is to use the capabilities of matlab. The lookfor function helps you to find the name of a function that you know must exist, but you simply don't know what it might be called. You want to compute some root of a number. So why not try this: lookfor root If you did that, you would have found a few functions that compute roots. Next, you might benefit from looking at some of the elementary functions in matlab. So try this: help elfun Look there. You will find a few functions to compute roots. Finally, you should recognize that a root is simply a power. So lookfor power might give something interesting. John