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Resolve the Error “attempt to set ‘colnames’ on an object with less than two dimensions” - TutoPal

Resolve the Error “attempt to set ‘colnames’ on an object with less than two dimensions”

R is a software environment as well as a programming language used for graphics reporting and representation, and statistical analysis. R is an open-source and free language that interprets the code and makes coding simpler for programmers and developers. When working with R, you may encounter the error “attempt to set ‘colnames’ on an object with less than two dimensions”.

How the error pops up

When you attempt to add a new row for open price at the end of the data frame ‘SPY’ that is produced using package quantmod, you get the following error warning:

Error in `colnames<-`(`*tmp*`, value = c("SPY.Open", "SPY.High", "SPY.Low",  : 
  attempt to set 'colnames' on an object with less than two dimensions # creating the column names

This error appears when you use the following code to rbind new row:

# rm(list = ls())  # generally considered as bad manner in an MWE
require(quantmod)
options(scipen=999)
spy <- getSymbols(("SPY") , src = 'yahoo', from = '2016-01-01', auto.assign = T)
spy<-cbind(SPY)
tail(SPY)
           SPY.Open SPY.High SPY.Low SPY.Close SPY.Volume SPY.Adjusted
2016-01-14   189.55   193.26  187.66    191.93  240795600       191.93
2016-01-15   186.77   188.76  185.52    187.81  324846400       187.81
2016-01-19   189.96   190.11  186.20    188.06  190196000       188.06
2016-01-20   185.03   187.50  181.02    185.65  280016900       185.65
2016-01-21   186.21   188.87  184.64    186.69  189174000       186.69
2016-01-22   189.78   190.76  188.88    190.52  163849600       190.52

When you manually try to add a new row into the dataset spy for creating a new xts object to later use the function rbind, you typed the following lines:

q <- c("2016-01-25",100,200,200,200,200,200) # creating the data
colnames(q) <- colnames(SPY) # creating column names as in SPY

All of these code scripts return an error to make you think about what could be the best solution to handle it. Well, check out the next section to know it

The Solution to Handle the Error “attempt to set ‘colnames’ on an object with less than two dimensions”

The error appears when setting ‘colnames’ on an object that has dimensions of more than two. To fix the error efficiently, we bring an amazing solution. Take a look at it

Solution

The code you are trying to execute is somehow like this:

q <- data.frame(100,200,200,200,200,200)
colnames(q) <- colnames(SPY)
q <- xts(q, as.Date("2016-01-26"))
#            SPY.Open SPY.High SPY.Low SPY.Close SPY.Volume SPY.Adjusted
# 2016-01-26      100      200     200       200        200          200

class(SPY)
# [1] "xts" "zoo"
class(q)
# [1] "xts" "zoo"

tail(rbind(SPY, q))
#            SPY.Open SPY.High SPY.Low SPY.Close SPY.Volume SPY.Adjusted
# 2016-01-19   189.96   190.11  186.20    188.06  190196000       188.06
# 2016-01-20   185.03   187.50  181.02    185.65  280016900       185.65
# 2016-01-21   186.21   188.87  184.64    186.69  189174000       186.69
# 2016-01-22   189.78   190.76  188.88    190.52  163849600       190.52
# 2016-01-25   189.92   190.15  187.41    187.64  122676200       187.64
# 2016-01-26   100.00   200.00  200.00    200.00        200       200.00

Conclusion

We discussed a short and simple solution to help you fix the error “attempt to set ‘colnames’ on an object with less than two dimensions”. It is easy to implement as well as really effective.

I hope you find it interesting and helpful!

If you need further assistance, feel free to write to us in the comment box below and we will get back to you with tips and solutions to address your issue.

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