r - combine data frames after for loop -

i have list. start loop, in loop first convert variable names strings , assign list contend strings right name right content. after loop has finished want combine item#1 #4 list, item#2 , #5 ect. when combining items following:

error in [.data.frame(loopvariable, , "f_corrected_normed_error") : undefined columns selected

later 1 when want calculations inorganicnostdcondition

here code example:

residuallist = list(iaea_c2_nostdcondition = iaea_c2_nostdcondition,                     iaea_c2_eastd = iaea_c2_eastd,                     iaea_c2_ststd = iaea_c2_ststd,                     iaea_c2_bothstd = iaea_c2_bothstd,                     tiri_i_nostdcondition = tiri_i_nostdcondition,                     tiri_i_eastd = tiri_i_eastd,                     tiri_i_ststd = tiri_i_ststd,                     tiri_i_bothstd = tiri_i_bothstd                     )            c = 8  for(j in 1:c) {  #convert list variable string later usage in filename unique identifier!!      subnamestring = names(residuallist)[j] subnamestring = paste0(subnamestring, "residuals")  #print(subnamestring) subnamestring = residuallist[[j]]    subnamestring[ ,"f_corrected_normed"] = round(subnamestring[ ,"f_corrected_normed"] /       mean(subnamestring[ ,"f_corrected_normed"]),                                               digit = 5                                               )  subnamestring[ ,"f_corrected_normed_error"] = round(subnamestring[ ,"f_corrected_normed_error"] / mean(subnamestring[ ,"f_corrected_normed_error"]),                                                     digit = 5                                                     ) #view(subnamestring[ ,"f_corrected_normed"]) #print(subnamestring)  }       view(subnamestring)       inorganicnostdcondition = data.frame(cbind(iaea_c2_nostdconditionresiduals,                                                   tiri_i_nostdconditionresiduals                                                  )                                            ) 

if wanted change names of residuallist, do:

   names(residuallist) <- paste0(names(residuallist), 'residuals') 

if want use for loop

for(j in 1:c){    names(residuallist)[j] <- paste0(names(residuallist[j]), 'residuals')    residuallist[[j]][ ,"f_corrected_normed"] <- round(residuallist[[j]][       ,"f_corrected_normed"] / mean(residuallist[[j]][ ,"f_corrected_normed"]),                                            digit = 5)    residuallist[[j]][ ,"f_corrected_normed_error"] <- round(residuallist[[j]][     ,"f_corrected_normed_error"] / mean(residuallist[[j]][     ,"f_corrected_normed_error"]),digit = 5)                                       }     names(residuallist)   #[1] "iaea_c2_nostdconditionresiduals" "iaea_c2_eastdresiduals"            #[3] "iaea_c2_ststdresiduals"          "iaea_c2_bothstdresiduals"          #[5] "tiri_i_nostdconditionresiduals"  "tiri_i_eastdresiduals"             #[7] "tiri_i_ststdresiduals"           "tiri_i_bothstdresiduals"     

for combining list elements 1 5, 2 6 etc.

res <- lapply(1:4, function(i) do.call(`cbind`,residuallist[c(i, i+4)])) 

it not clear how want column names named in each list element of res

data

 set.seed(29)  iaea_c2_nostdcondition <- data.frame(f_corrected_normed=rnorm(10),      f_corrected_normed_error=runif(10))  iaea_c2_eastd <- data.frame(f_corrected_normed=rnorm(10),       f_corrected_normed_error=runif(10))  iaea_c2_ststd <- data.frame(f_corrected_normed=rnorm(10),       f_corrected_normed_error=runif(10))  iaea_c2_bothstd <- data.frame(f_corrected_normed=rnorm(10),       f_corrected_normed_error=runif(10))  tiri_i_nostdcondition <- data.frame(f_corrected_normed=rnorm(10),       f_corrected_normed_error=runif(10))  tiri_i_eastd <-   data.frame(f_corrected_normed=rnorm(10),       f_corrected_normed_error=runif(10))  tiri_i_ststd <- data.frame(f_corrected_normed=rnorm(10),       f_corrected_normed_error=runif(10))  tiri_i_bothstd <- data.frame(f_corrected_normed=rnorm(10),       f_corrected_normed_error=runif(10))        residuallist <- list(iaea_c2_nostdcondition = iaea_c2_nostdcondition,                    iaea_c2_eastd = iaea_c2_eastd,                    iaea_c2_ststd = iaea_c2_ststd,                    iaea_c2_bothstd = iaea_c2_bothstd,                    tiri_i_nostdcondition = tiri_i_nostdcondition,                    tiri_i_eastd = tiri_i_eastd,                    tiri_i_ststd = tiri_i_ststd,                    tiri_i_bothstd = tiri_i_bothstd                 )