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I want to subtract 2 from the first two columns and the last column.
In R I'd do
first = c(1, 4, 2, 3, 6)
second = c(2, 5, 3, 4, 4)
third = c(2, 4, 4, 5, 6)
fourth = c(3, 5, 5, 6, 7)
df = data.frame(first, second, third, fourth)
df[, c(1, 5) - c(2, 3)]
But the way I usually do this is to get this:
df = data.frame(first, second, third, fourth)
sumdf = cbind(first, second, third, fourth)
subdf = df - sumdf
Which obviously is not useful because I don't know how many columns I'll have.
What is the most efficient way to do this?
Can you help me with that please?
A:
You are missing an extra comma after the cbind:
sumdf = cbind(first, second, third, fourth)
here the extra comma separates cbind's inputs (which are (1,2,3,4), into a list (1,2,3,4,), then the data frame name (sumdf) from a list (1,2,3,4,), to produce the final result (1,2,3,4,5,5,6,6,7). The resulting matrix is then passed to your function to subtract c(2,3).
Further,
subdf = df - sumdf
is basically the same as
sumdf[c(1,5)] = cbind(first, second, third, fourth)
subdf = df - sumdf
This section is intended to introduce various aspects of the art, which may be associated with exemplary embodiments of the present invention. This discussion is believed to assist in providing a framework to facilitate a better understanding of particular aspects of the present invention. Accordingly, it should be understood that this section should be read in this light, and not necessarily as admissions of prior art.
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