https://communities.sas.com/t5/Statistical-Procedures/Newton-Rhapson-in-SAS-IML/m-p/64371#M3060 Need code to solve the following equation using Newton-Rhapson for a system of equations in SAS IML?<BR /> <BR /> ∑ (t=1)^T (Yj-Xj)/<BR /> (1+r)^t -c=0<BR /> <BR /> Y is the income stream of the jth student from time, t=1, until the end. X is the income stream of the control group. r is the discount rate or the percentage money declines in value each year. <BR /> <BR /> I have R code to do this but I know very little about R and can’t understand what is going on so any help for SAS will be greatly appreciated. Sorry about the equation. I tried to copy in and the format went nuts. Tue, 10 May 2011 14:26:43 GMT nickb 2011-05-10T14:26:43Z https://communities.sas.com/t5/Statistical-Procedures/Newton-Rhapson-in-SAS-IML/m-p/64371#M3060 Need code to solve the following equation using Newton-Rhapson for a system of equations in SAS IML?<BR /> <BR /> ∑ (t=1)^T (Yj-Xj)/<BR /> (1+r)^t -c=0<BR /> <BR /> Y is the income stream of the jth student from time, t=1, until the end. X is the income stream of the control group. r is the discount rate or the percentage money declines in value each year. <BR /> <BR /> I have R code to do this but I know very little about R and can’t understand what is going on so any help for SAS will be greatly appreciated. Sorry about the equation. I tried to copy in and the format went nuts. Tue, 10 May 2011 14:26:43 GMT https://communities.sas.com/t5/Statistical-Procedures/Newton-Rhapson-in-SAS-IML/m-p/64371#M3060 nickb 2011-05-10T14:26:43Z https://communities.sas.com/t5/Statistical-Procedures/Newton-Rhapson-in-SAS-IML/m-p/64372#M3061 If you have the code in R to do this, why do you need the code in SAS to do this? Can't you just run the R code and get your answer? Tue, 10 May 2011 15:16:09 GMT https://communities.sas.com/t5/Statistical-Procedures/Newton-Rhapson-in-SAS-IML/m-p/64372#M3061 Paige 2011-05-10T15:16:09Z