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I want to calculate RMSE using predicted and actual values. Is there any R library that can be used instead of writing my own function?

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There is an R library, "Metrics". Its rmse() function can be used to calculate the RMSE. 

Here is an example:

# Install and load the Metrics package

if (!require("Metrics")){

  install.packages("Metrics")  

}

library(Metrics)

preds <- c(0.02, 0.04, 0.06, 0.65, 0.1)

trus <- c(0.012, 0.104, 0.206, 0.165, 0.21)

rmse(trus, preds)

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