What is the syntax for this atan2 formula ?
in [Matlab]
|
From: Lauren Gavy on 15 Jun 2010 01:43 "Bruno Luong" <b.luong(a)fogale.findmycountry> wrote in message <hv73ag$fnd$1(a)fred.mathworks.com>... > "Lauren Gavy" <laurengavy(a)gmail.com> wrote in message <hv7315$rie$1(a)fred.mathworks.com>... > > "Bruno Luong" <b.luong(a)fogale.findmycountry> wrote in message <hv71vc$mgu$1(a)fred.mathworks.com>... > > > "Lauren Gavy" <laurengavy(a)gmail.com> wrote in message <hv70o0$2qs$1(a)fred.mathworks.com>... > > > > I tried almost everything, but with no success. Any ideas ? > > > > Here's the link for the formula in a jpg format : > > > > > > > > http://forum.bgu.co.il/uploads/monthly_06_2010/post-24033-12765479851708.jpg > > > > > > > > Thank you > > > > > > Try > > > > > > theta = 0.5*atan2(2*I11, I20-I02) > > > > > > Read the doc is also sometime helpful. > > > > > > Bruno > > > > Thank you for your answer and I'm sorry for the double post. I read the doc but couldn't get it to work, It's the exact thing I tried. The error I'm getting is: > > > > ??? Undefined function or method 'atan2' for input arguments of type 'uint8'. > > Convert your image to *double* before doing any computation. > > Im = imread(somefile); > Im = double(Im); > % ... > > % Bruno Problem solved, thank you and have a great day!
From: Steven Lord on 15 Jun 2010 10:02 "Lauren Gavy" <laurengavy(a)gmail.com> wrote in message news:hv70o0$2qs$1(a)fred.mathworks.com... >I tried almost everything, but with no success. Any ideas ? Here's the link >for the formula in a jpg format : > > http://forum.bgu.co.il/uploads/monthly_06_2010/post-24033-12765479851708.jpg > > Thank you Are you certain that the equation you posted is actually a call to ATAN2? The spacing between the first A and the T as well as the N and the 2 makes me a little suspicious as to whether it's asking you to compute (a/2)*tan(2*...). You might want to double-check with the source of that equation to determine if it intends you to call ATAN2 or to call TAN. -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ To contact Technical Support use the Contact Us link on http://www.mathworks.com
From: Bruno Luong on 15 Jun 2010 10:31 "Steven Lord" <slord(a)mathworks.com> wrote in message <hv815t$oup$1(a)fred.mathworks.com>... > > "Lauren Gavy" <laurengavy(a)gmail.com> wrote in message > news:hv70o0$2qs$1(a)fred.mathworks.com... > >I tried almost everything, but with no success. Any ideas ? Here's the link > >for the formula in a jpg format : > > > > http://forum.bgu.co.il/uploads/monthly_06_2010/post-24033-12765479851708.jpg > > > > Thank you > > Are you certain that the equation you posted is actually a call to ATAN2? > The spacing between the first A and the T as well as the N and the 2 makes > me a little suspicious as to whether it's asking you to compute > (a/2)*tan(2*...). Steve it looks like this formula computed the phase angle (thus the name "theta") from intensity (perhaps from some interferometer data). Bruno
First
|
Prev
|
Pages: 1 2 Prev: What is the syntax for this atan2 formula ? Next: mathlab with interactive language ( flash) |