'R:How to select the amount of data in a dataset by a given variable
Let's take dataset iris and there is static value g=101. Iris dataset has 150 value.
How to select exactly as many observations in the iris dataset as indicated in the variable g starting from the very first observation?
As final result will be iris dataset ,but with 101 obs.
Solution 1:[1]
We can use seq_len on 'g' and use as row index
g <- 101
iris_sub <- iris[seq_len(g),]
-output
> dim(iris_sub)
[1] 101 5
Solution 2:[2]
in a dataframe, isn't this the basic df[1: n,] will select all records from 1 to N and all columns if none is specified. (If you have modified the data - say sorted etc and saved, it will show saved result]
so iris[1:g,] will itself work. No need for anything more with g <- 101
Sources
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Source: Stack Overflow
| Solution | Source |
|---|---|
| Solution 1 | akrun |
| Solution 2 | anuanand |