Hi I have a code that calculate maximisation using optimx and it is working just fine. I want to extend the code to run several colomns of R_j where j runs from 1 to 200. If I am to run the code in its current state, it means I will have to run it 200 times manually. May you help me adjust it to accomodate several rows of R_j and print the 200 results.
***Please do not get intimidated by the maths in the code.*** my code ###### afull=read.table("D:/hope.txt",header=T) library(optimx) llik = function(x) { al_j=x[1]; au_j=x[2]; sigma_j=x[3]; b_j=x[4] sum(na.rm=T, ifelse(a$R_j< 0, log(1 / ( sqrt(2*pi) * sigma_j) )- (1/( 2*sigma_j^2 ) ) * ( (a$R_j+al_j-b_j*a$R_m)^2 ) , ifelse(a$R_j>0 , log(1 / ( sqrt(2*pi) * sigma_j) )- (1/( 2*sigma_j^2 ) ) * ( (a$R_j+al_j-b_j*a$R_m)^2 ) , log(ifelse (( pnorm (au_j, mean=b_j * a$R_m, sd= sqrt(sigma_j^2))- pnorm(al_j, mean=b_j * a$R_m, sd=sqrt (sigma_j^2)) ) > 0, (pnorm (au_j,mean=b_j * a$R_m, sd= sqrt(sigma_j^2))- pnorm(al_j, mean=b_j * a$R_m, sd= sqrt(sigma_j^2) )), 1) ) ) ) ) } start.par = c(-0.01,0.01,0.1,1) #looping now runs=133/20+1 out <- matrix(NA, nrow = runs, ncol = 4, dimnames = list(paste("Qtr:", 1:runs , sep = ''), c("al_j", "au_j", "sigma_j", "b_j"))) ## Estimate parameters based on rows 0-20, 21-40, 41-60 of afull for (i in 1:runs) { index_start=20*(i-1)+1 index_end= 20*i a=afull[index_start:index_end,] out[i, ] <- optimx(llik,par = start.par,method = "Nelder-Mead", control=list(maximize=TRUE) )[[1]][[1]] } ## Yields > out al_j au_j sigma_j b_j Qtr:1 0.0012402032 0.001082986 0.012889809 1.14095125 Qtr:2 0.0011302178 0.582718275 0.009376083 0.06615565 Qtr:3 0.0013349347 0.417495301 0.013286103 0.60548903 Qtr:4 -0.0016659441 0.162250321 0.015088915 0.67395511 Qtr:5 0.0043159984 0.004315976 0.013153039 1.17341907 Qtr:6 0.0027333033 0.527280348 0.018423347 0.53905153 Qtr:7 -0.0009214064 0.749695104 0.008730072 0.02108032 > -- View this message in context: http://r.789695.n4.nabble.com/Extend-my-code-to-run-several-data-at-once-tp3688823p3688823.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.