I've been looking for how to change a certain percentage of values in a data
frame, but I've been struggling to find information in R.
For example:
#################example data##############
> data
V1 V2 V3 V4 V5 V6 V7
1 chr1 500 500 CHH 0 0.5 +
2 chr1 550 550 CHH 0 0.0 +
3 chr2 700 700 CHH 0 0.0 +
4 chr2 1000 1000 CHH 0 0.0 +
5 chr3 100 100 CHH 0 0.0 +
6 chr4 450 450 CG 0 0.0 +
7 chr5 450 450 CHH 0 0.0 +
8 chr5 50034 50034 CHG 0 0.0 +
9 chr7 50055 50055 CHG 0 0.0 +
10 chr10 50063 50063 CHH 0 0.0 +
> dput(data)
structure(list(V1 = structure(c(1L, 1L, 3L, 3L, 4L, 5L, 6L, 6L,
7L, 2L), .Label = c("chr1", "chr10", "chr2", "chr3", "chr4",
"chr5", "chr7"), class = "factor"), V2 = c(500L, 550L, 700L,
1000L, 100L, 450L, 450L, 50034L, 50055L, 50063L), V3 = c(500L,
550L, 700L, 1000L, 100L, 450L, 450L, 50034L, 50055L, 50063L),
V4 = structure(c(3L, 3L, 3L, 3L, 3L, 1L, 3L, 2L, 2L, 3L), .Label =
c("CG",
"CHG", "CHH"), class = "factor"), V5 = c(0L, 0L, 0L, 0L,
0L, 0L, 0L, 0L, 0L, 0L), V6 = c(0.5, 0, 0, 0, 0, 0, 0, 0,
0, 0), V7 = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,
1L), .Label = "+", class = "factor")), .Names = c("V1", "V2",
"V3", "V4", "V5", "V6", "V7"), class = "data.frame", row.names = c(NA,
-10L))
>
############################
Say for instance, I'd like to change 20% of values in column 6 to '1'
instead of zero or whatever value may be currently present. How would I
approach this?
I am working with a large data frame and I need to replace values in one of
the columns for 10-20% of the entire dataset. I hope what I am trying to
convey is understandable to you.
--
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