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I'm playing around with R and trying to get the average of a column. Just mean(V1) doesn't work.
Could anybody give me an advice?
Thank you!
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The mean() is a built-in R function that takes an input vector as an argument and returns the mean of the vector elements. The mean is calculated by taking a sum of the values and dividing by the number of values in the data.
Average is the sum divided by n, the number of elements in the vector.
You can get an average R-value of a mixed surface by multiplying their respective U-value by the percentage of their area, then sum them. U-value is the inverse of R-value. A material with R-value of 10 has a U-value of 1/10 = 0.1.
Average in R Programming To compute the average of values, R provides a pre-defined function mean(). This function takes a Numerical Vector as an argument and results in the average/mean of that Vector.
A: mean(D$V1) ... column names are not first class objects. They are part of a data.frame with a name that needs to be used.
Q: es, thanks. So $ is like the dot-operator? – user1170330 4 mins ago
A: Perhaps (depending on which language is being compared.) it is possible to construct list objects with cascaded calls to $<- and then obj$V1$subV1 to extract. Review ?Extract very carefully.
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