ZJAY ZJAY - 19 days ago 5
R Question

Taking a mean of two vectors in R

I would like to take the mean of the two vectors below and store the value in vector B2. Note that I am trying to take the mean value by ROW.

When I use:

B2 <-mean(Macro$X1372C,Macro$X5244C)


I get the error: Error in mean.default(Macro$X1372C, Macro$X5244C) :
'trim' must be numeric of length one. What code should I be using?

enter image description here

The mean vector would look like:

Mean

2.960409952

3.012362779

3.920078183

3.286110877

3.994996196

3.916488088

5.071798314

3.745693115

4.852409799

4.438490606

5.256816758

4.174125673

5.076089227

4.532386721

Answer

You want to use rowMeans(), which produces a vector of the mean of several columns for each row. The input must be an array (i.e., matrix) or data frame.

The code you want is:

 B2 <-rowMeans(cbind(Macro$X1372C,Macro$X5244C))

cbind() puts the two vectors into an array.