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MathGroup Archive 2006

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Re: 3 second question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg70965] Re: 3 second question
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Fri, 3 Nov 2006 01:39:11 -0500 (EST)
  • Organization: The Open University, Milton Keynes, UK
  • References: <eicn1n$fri$1@smc.vnet.net>

kevin_jazz wrote:
> I've been away from Mathematica for a couple of months and I feel like
> I've forgotten everything.  Here's a basic question:
> I've copied the following from my notebook:
> 
> In[9]:=
> vals =
> Import["/Users/kbowman/TES/Limb/RetrievalOutputAtomicVals.asc","List"]
> 
> Out[9]=
> {TES_File_ID,=,L2_RetrievalOutput,Diagnostic,Atomic,Values,Creation_Date,=,\
> Tue,03-Oct-2006,14:10:53,Data_Size,=,0,x,0,NumCompletedIterations,=,5,\
> BestIterationNumber,=,4,Converged,=,YES,BestResidualNorm,=,1.02662,\
> BestPointingAngle,=,1.12479,BestCloudODFactor,=,0,ErrorSurfaceLinearity(rho),=\
> ,1.1324,IncrementSizeControlParameter(lambda),=,0.,TrustRegion,(delta),=,2.\
> 07864,CostFunctionDerivative,=,1.04831,StateVectorChange,=,0.0000974532,\
> CostFunctionChange,=,0.0000585313,StopCode,=,3,StopCodeDescription,=,\
> Convergence,reached:,costFuncDerivative,<=,sqrt(threshold),AND,\
> stateVectorChange,<=,sqrt(threshold),AND,costFuncChange,<=,threshold,(Stop,\
> Code,3).,End_of_Header,****,End_of_Header,****,End_of_Header,****,End_of_\
> Header}
> 
> In[29]:=
> retfiles =
> FileNames["RetrievalOutputAtomicVals*","/Users/kbowman/TES/",3]
> 
> Out[29]=
> {/Users/kbowman/TES/Limb/RetrievalOutputAtomicVals2.asc,/Users/kbowman/TES/\
> Limb/RetrievalOutputAtomicVals.asc}
> 
> In[32]:=
> vals=Map[Import[#,"List"]&,retfiles]
> 
> Out[32]=
> {{TES_File_ID,=,L2_RetrievalOutput,Diagnostic,Atomic,Values,Creation_Date,=,\
> Tue,03-Oct-2006,14:10:53,Data_Size,=,0,x,0,
> 
> NumCompletedIterations,=,5,BestIterationNumber,=,4,Converged,=,YES,\
> BestResidualNorm,=,1.02662,BestPointingAngle,=,
>     1.12479,BestCloudODFactor,=,0,ErrorSurfaceLinearity(rho),=,
> 
> 1.1324,IncrementSizeControlParameter(lambda),=,0.,TrustRegion,(delta),=,
>     2.07864,CostFunctionDerivative,=,1.04831,StateVectorChange,=,
>     0.0000974532,CostFunctionChange,=,0.0000585313,StopCode,=,3,\
> StopCodeDescription,=,Convergence,reached:,costFuncDerivative,<=,sqrt(\
> threshold),AND,stateVectorChange,<=,sqrt(threshold),AND,costFuncChange,<=,\
> threshold,(Stop,Code,3).,End_of_Header,****,
>     End_of_Header,****,End_of_Header,****,End_of_Header},{
> 
> TES_File_ID,=,L2_RetrievalOutput,Diagnostic,Atomic,Values,Creation_Date,=,\
> Tue,03-Oct-2006,13:48:52,Data_Size,=,0,x,0,NumCompletedIterations,=,2,\
> BestIterationNumber,=,2,Converged,=,YES,BestResidualNorm,=,0.990839,\
> BestPointingAngle,=,1.12538,BestCloudODFactor,=,0,ErrorSurfaceLinearity(rho),=\
> ,0.925106,IncrementSizeControlParameter(lambda),=,0.,TrustRegion,(delta),=,37.\
> 0709,CostFunctionDerivative,=,0.285889,StateVectorChange,=,0.000286536,\
> CostFunctionChange,=,0.00382743,StopCode,=,3,StopCodeDescription,=,\
> Convergence,reached:,costFuncDerivative,<=,sqrt(threshold),AND,\
> stateVectorChange,<=,sqrt(threshold),AND,costFuncChange,<=,threshold,(Stop,
>     Code,3).,End_of_Header,****,End_of_Header,****,End_of_Header,****,
>     End_of_Header}}
> 
> \!\(p\_res = \([vals, "\<BestResidualNorm\>"]\)\)
> 
> Out[33]=
> {{1,26},{2,26}}
> 
> All I want to do right now is to use p_res to extract the elements in
> the list vals given the positions provided in p_res.  I tried several
> things including the following:
> 
> \!\(p\_res /. {x_, y_} \[Rule] vals[\([x, y]\)]\)
> 
> It doesn't work.  Can someone tell me how to do this?
> 
> Thanks for your forbearance,
> 
> Kevin
> 
Hi Kevinn,

Extract[vals, p_res]

should do it.

Regards,
Jean-Marc


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