---
name: "randsample"
section: "1"
platform: "linux"
package: "macs"
version: "2.0.9.1-1"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/randsample"
---

# randsample(1)

Random sample certain number/percentage of tags

## NAME

randsample - Random sample certain number/percentage of tags

## SYNOPSIS

**randsample** *\<-t file\>* \[*-p percent\|-n number*\] \[*-o outputfile*\] \[*options*\]

## DESCRIPTION

randsample **--** Random sample certain number/percentage of tags. Method: 1. Calculate the percentage of tags needed to be kept; 2. For each chromosome, random sample certain percentage of tags.

## OPTIONS

- **--version**

  show program's version number and exit

- **-h**, **--help**

  show this help message and exit.

- **-t** TFILE

  Sequencing alignment file. REQUIRED.

- **-p** PERCENTAGE, **--percentage**=*PERCENTAGE*

  Percentage of tags you want to keep. Input 80.0 for 80%. This option can't be used at the same time with **-n**/--num. REQUIRED

- **-n** NUMBER, **--number**=*NUMBER*

  Number of tags you want to keep. Input 8000000 or 8e+6 for 8 million. This option can't be used at the same time with **-p**/--percent. Note that the number of tags in output is approximate as the number specified here. REQUIRED

- **-o** OUTPUTFILE

  Output BED file name. If not specified, will write to standard output. DEFAULT: stdout

- **-s** TSIZE, **--tsize**=*TSIZE*

  Tag size. This will overide the auto detected tag size. DEFAULT: Not set

- **-f** FORMAT, **--format**=*FORMAT*

  Format of tag file, "AUTO", "BED" or "ELAND" or "ELANDMULTI" or "ELANDEXPORT" or "SAM" or "BAM" or "BOWTIE". The default AUTO option will let %prog decide which format the file is. Please check the definition in 00README file if you choose ELAND/ELANDMULTI/ELANDEXPORT/SAM/BAM/BOWTIE. DEFAULT: "AUTO"

- **--verbose**=*VERBOSE*

  Set verbose level. 0: only show critical message, 1: show additional warning message, 2: show process information, 3: show debug messages. If you want to know where are the duplicate reads, use 3. DEFAULT:2