MATLAB Central > MATLAB Newsreader > Obtaining real answers with lsqcurvefit

Thread Subject: Obtaining real answers with lsqcurvefit

Subject: Obtaining real answers with lsqcurvefit

From: geg1633 Mona

Date: 2 Jul, 2009 23:00:03

Message: 1 of 1

Reply to this message

Add author to My Watch List

View original format

Flag as spam

Hello all,

I'm fit a dataset to F=A.x^2+log(Bx+C). My lower bounds for A, B and C are Zero, and my upper bounds vary between 10 and .1.

After a few iterations, lsqcurvefit outputs imaginary estimates for A,B, and C.

My question is:
1- How can I force it to output only real values?
2-How can I impose 0< Bx+C <.1?

Thanks!

Tags for this Thread

Add a New Tag:

Separated by commas
Ex.: root locus, bode

What are tags?

A tag is like a keyword or category label associated with each thread. Tags make it easier for you to find threads of interest.

Anyone can tag a thread. Tags are public and visible to everyone.

Feed for this Thread

MATLAB Central Terms of Use

NOTICE: Any content you submit to MATLAB Central, including personal information, is not subject to the protections which may be afforded information collected under other sections of The MathWorks, Inc. Web site. You are entirely responsible for all content that you upload, post, e-mail, transmit or otherwise make available via MATLAB Central. The MathWorks does not control the content posted by visitors to MATLAB Central and, does not guarantee the accuracy, integrity, or quality of such content. Under no circumstances will The MathWorks be liable in any way for any content not authored by The MathWorks, or any loss or damage of any kind incurred as a result of the use of any content posted, e-mailed, transmitted or otherwise made available via MATLAB Central. Read the complete Terms prior to use.