get_cumulative_positions: Assign cumulative positions to postions split by scaffolds.

In nwvankuren/genomics-plotting: Utilities for plotting statistics from genome-wide analyses

Description

This function will add a new column to your tibble, bp_cum with the cumulative sum of positions in the ps column. This makes it so that the stat in each row in the tibble can be plotted sequentially.

Usage

get_cumulative_positions(input, scaffold_lengths, buffer = 0,
  after = "scaffolds")

Arguments

input	A tibble with the columns scaf (scaffold), ps (position), and stat (statistic) at the minimum. This function operates on the ps column.
scaffold_lengths	Path to the two-column tab-delimited file containing scaffold name and length.
buffer	Extra amount to add between consecutive scaffolds or chromosomes.
after	Where to add buffer, either after scaffolds or chromosomes.

Value

The original tibble, containing a new column, bp_cum, with cumulative positions.

Examples

a1 <- system.file("extdata", "test.gemma_gwas.txt.gz",
                  package = "gwplotting" )

a2 <- system.file("extdata", "test.chromSizes.txt.gz",
                  package = "gwplotting" )

b <- load_gemma_gwas( a1, pval = 'p_wald' )
b <- get_cumulative_positions( input = b, scaffold_lengths = a2,
buffer=1000, after = 'scaffolds' )
b

nwvankuren/genomics-plotting documentation built on April 14, 2021, 1:18 a.m.