Assigning values of an object to a column in Loop through R -

this snippet of r code. trying assign value of resultsdata[i] column error values not assigning. results coming in console somehow not able assign required column

resultsdata=foreach(i=1:length(xyzarr)) %dopar% {       xyzred[xyzsred$loopn==xyzarr[i],]$setpoint-xyzred[xyzred$loopn==xyzarr[i],]$temp } foreach(i=1:length(xyzarr)) %dopar%{   xyzred[xyzred$loopn==datapointsarr[i],]$error=resultsdata[[i]] }  results in console: [[1]]  [1] 1.186 1.186 1.186 1.186 1.186 1.186 1.186 1.186 1.186 1.186 1.186 1.186 1.186 2.266 2.266 2.266 2.266 2.266 [19] 2.266 2.266 2.266 2.266 1.384 2.392 2.392 

i typically use combine feature. general approach calculate column, output entire row. lastly, row binding logic puts together.

xyzarr$var_name_here <- numeric(nrow(xyzarr)) resultsdata <- foreach(i=1:length(xyzarr), .combine=rbind) %dopar% {     xyzarr[i,]$var_name_here <- xyzred[xyzsred$loopn==xyzarr[i],]$setpoint-xyzred[xyzred$loopn==xyzarr[i],]$temp xyzarr[i,] }