Large Scale Problem: lsqnonneg vs lsqlin
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From: Dushyant on 25 May 2010 15:31 My problem is: I am not able to make "lsqlin" run till lower value of "resnorm" is obtained (from 10^-5 to say 10^-8). I think that I am not able to set the options.
From: Alan Weiss on 26 May 2010 08:19 On 5/25/2010 3:28 PM, Dushyant wrote: > Any Response ... > My problem is: > I am not able to make "lsqlin" run till lower value of "resnorm" is > obtained (from 10^-5 to say 10^-8). > > I think that I am not able to set the options. Can you post some output? Why did lsqlin stop? You don't have many options to set, but there are some possibilities. For example, you can set TolFun to 10*eps, instead of the default 100*eps, but this might not help, depending on the reason lsqlin stopped. Alan Weiss MATLAB mathematical toolbox documentation
From: Dushyant Kumar on 26 May 2010 11:43 Alan Weiss <aweiss(a)mathworks.com> wrote in message <htj3l1$4mb$1(a)fred.mathworks.com>... > On 5/25/2010 3:28 PM, Dushyant wrote: > > Any Response ... > > My problem is: > > I am not able to make "lsqlin" run till lower value of "resnorm" is > > obtained (from 10^-5 to say 10^-8). > > > > I think that I am not able to set the options. > > Can you post some output? Why did lsqlin stop? You don't have many > options to set, but there are some possibilities. For example, you can > set TolFun to 10*eps, instead of the default 100*eps, but this might not > help, depending on the reason lsqlin stopped. > > Alan Weiss > MATLAB mathematical toolbox documentation Thanks Alan for responding to my message.. This is the return message.. resnorm = 1.3057e-007 exitflag = 3 Also, the code is located at: http://docs.google.com/leaf?id=0B0Ah9soYnrlIN2MzN2QyNDctYWVmYy00OWE4LWI2ZTUtMDZkMTRmYTBjZDRi&hl=en Once downloaded, you can call: [x2_3D,residual, resnorm,exitflag] = Test_LSQNONNEG_n_SpatialReg() Dushyant
From: Dushyant Kumar on 26 May 2010 11:48 Also, can someone tell me how can I control resnorm by changing in tolfun?
From: Alan Weiss on 26 May 2010 11:50 On 5/26/2010 11:43 AM, Dushyant Kumar wrote: > Alan Weiss <aweiss(a)mathworks.com> wrote in message > <htj3l1$4mb$1(a)fred.mathworks.com>... >> On 5/25/2010 3:28 PM, Dushyant wrote: >> > Any Response ... >> > My problem is: >> > I am not able to make "lsqlin" run till lower value of "resnorm" is >> > obtained (from 10^-5 to say 10^-8). >> > >> > I think that I am not able to set the options. >> >> Can you post some output? Why did lsqlin stop? You don't have many >> options to set, but there are some possibilities. For example, you can >> set TolFun to 10*eps, instead of the default 100*eps, but this might >> not help, depending on the reason lsqlin stopped. >> >> Alan Weiss >> MATLAB mathematical toolbox documentation > > Thanks Alan for responding to my message.. > This is the return message.. > > resnorm = > > 1.3057e-007 > > > exitflag = > > 3 > > Also, the code is located at: > http://docs.google.com/leaf?id=0B0Ah9soYnrlIN2MzN2QyNDctYWVmYy00OWE4LWI2ZTUtMDZkMTRmYTBjZDRi&hl=en > > > Once downloaded, you can call: > [x2_3D,residual, resnorm,exitflag] = Test_LSQNONNEG_n_SpatialReg() > > Dushyant Exitflag 3 means "Change in the residual was smaller than the specified tolerance." So you could try setting TolFun to 10*eps, as I suggested above. You could even set it a little smaller, but don't set it less than eps. Did you misname your tes function above, or did you really use lsqnonneg instead of lsqlin? Alan Weiss MATLAB mathematical toolbox documentation
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