R for Loop Add Value to New Column - r

Question

I am trying to run a for loop in a R data frame to pull the Last Price of dataframe of stocks. I am having trouble appending the result to the original dataframe and using it as a second column. Here is the code I am working with thus far. I can get it to print but not add to a new column. I tried to set the loop value equal to a new column but I get an error
for (i in df_financials$Ticker){
df_financials$Last_Price=(bdp(i,'PX_LAST'))
}
Error in `$<-.data.frame`(`*tmp*`, "Last_Price", value = list(PX_LAST =
NA_real_)) :
replacement has 1 row, data has 147
Print(df_financials)
Ticker
1 ENH Equity
2 AXS Equity
3 BOH Equity
4 CNA Equity
5 TRH Equity

Answer 1

You first need to specify the order to apply your command to the stated vector and when to stop [i.e., use 1:length(df$Var) within for()]. Second, specify which row (i) of your new column to replace (i.e.,df$var[i]). Give the code below a try and see if that works.
for (i in 1:length(df_financials$Ticker)){
df_financials$Last_Price[i]=(bdp(i,'PX_LAST'))
}
I'm not familiar with the bdp() function itself. However, I suspect the
problem is that you are trying to pull data from a list with more stocks than you are interested in. If this is the case you need to reference the stock in row i that you want to obtain the last price for. If I'm understanding this correctly the code below should do the trick.
I'll assume that the list is something like
Stock<-data.frame(other_stocks = c("ENH","AXS","Rando1","BOH","CNA","TRH","Rando2","Rando3"),
PX_LAST=c(1,2,3,4,5,6,7,8))
Stock
for (i in 1:length(df$Ticker)){
df$Last_Price[i]=(bdp(df$Ticker[i],'PX_LAST'))
}