https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/Dual-quasi-newton/m-p/67810#M416 Can any one direct me to read papers about (Dual) quasi newton algorithm that is used when running the CALL NLPQN code, as I need to understand this algorithm Fri, 20 May 2011 12:16:25 GMT aya123 2011-05-20T12:16:25Z https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/Dual-quasi-newton/m-p/67810#M416 Can any one direct me to read papers about (Dual) quasi newton algorithm that is used when running the CALL NLPQN code, as I need to understand this algorithm Fri, 20 May 2011 12:16:25 GMT https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/Dual-quasi-newton/m-p/67810#M416 aya123 2011-05-20T12:16:25Z https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/Dual-quasi-newton/m-p/67811#M417 I assume you've already read the documentation:<BR /> <A href="http://support.sas.com/documentation/cdl/en/imlug/63541/HTML/default/viewer.htm#imlug_langref_sect207.htm" target="_blank">http://support.sas.com/documentation/cdl/en/imlug/63541/HTML/default/viewer.htm#imlug_langref_sect207.htm</A><BR /> <BR /> This includes references to paper, articles, and books.<BR /> <BR /> For a general understanding of numerical optimization, read<BR /> Fletcher, R. (1987), Practical Methods of Optimization, Second Edition, Chichester, UK: John Wiley &amp; Sons. <BR /> <BR /> or<BR /> <BR /> Gill, E. P., Murray, W., and Wright, M. H. (1981), Practical Optimization, New York: Academic Press. Fri, 20 May 2011 12:28:31 GMT https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/Dual-quasi-newton/m-p/67811#M417 Rick_SAS 2011-05-20T12:28:31Z