downsample_matrix {clustifyr} | R Documentation

## downsample matrix by cluster or completely random

### Description

downsample matrix by cluster or completely random

### Usage

    downsample_matrix(
      mat,
      n = 1,
      keep_cluster_proportions = TRUE,
      metadata = NULL,
      cluster_col = "cluster"
    )

### Arguments

`mat` | expression matrix
`n` | number per cluster or fraction to keep
`keep_cluster_proportions` | whether to subsample
`metadata` | data.frame or vector containing cluster assignments per cell. Order must match column order in supplied matrix. If a data.frame provide the cluster_col parameters.
`cluster_col` | column in metadata with cluster number

### Value

new smaller mat with less cell_id columns

### Examples

    set.seed(42)
    mat <- downsample_matrix(
        mat = pbmc_matrix_small,
        metadata = pbmc_meta$classified,
        n = 10,
        keep_cluster_proportions = TRUE
    )
    mat[1:3, 1:3]

[Package clustifyr version 1.6.0 Index]