This is because your vector is recycled:
data.frame(1)*1:4 = data.frame(1)*c(1,2,3,4)
only the first element is needed since the data frame has nothing else
to multiply with c(2,3,4)
(x<-data.frame(1:2, 3:4))
X1.2 X3.4
1 1 3
2 2 4
(y<-x*5:7)
y[1,1] = x[1,1] * 5
y[2,1] = x[2,1] * 6
y[1,2] = x[1,2] * 7
y[2,2] = x[2,2] * 5
since you have e vector with length 3, for the 4th entry in the
data.frame the first element in the vector is recycled.
hope this helps
On 03-04-2014 08:42, Spencer Graves wrote:
Hello, All:
What's the logic behind "data.frame(1)*1:4" producing a scalar
1? Or the following:
data.frame(1:2, 3:4)*5:7
X1.2 X3.4
1 5 21
2 12 20
I stumbled over this, because I thought I was multiplying a
scalar times a vector, and obtaining a scalar rather than the
anticipated vector. I learned that my "scalar" was in fact a
data.frame with one row and one column.
What am I missing?
Thanks,
Spencer
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