NanoPlot 0.16.1

Plotting suite for Oxford Nanopore sequencing data and alignments

Plotting tool for Oxford Nanopore sequencing data and alignments.

In addition to various plots also a NanoStats file is created summarizing key features of the dataset.

Example plot

The example plot above shows a bivariate plot comparing log transformed read length with average basecall Phred quality score. More examples can be found in the gallery on my blog ‘Gigabase Or Gigabyte’.

This script performs data extraction from Oxford Nanopore sequencing data in the following formats:

- fastq files

(can be bgzip, bzip2 or gzip compressed)

- fastq files generated by albacore or MinKNOW containing additional information

(can be bgzip, bzip2 or gzip compressed)

- sorted bam files

- sequencing_summary.txt output table generated by albacore

Installation

pip install NanoPlot

Upgrade to a newer version using:

pip install NanoPlot --upgrade

The script is written for python3 but also seems to work for python2.7.

USAGE:

NanoPlot [-h] [-v] [-t THREADS] [--maxlength MAXLENGTH]
        [--drop_outliers] [--downsample DOWNSAMPLE] [--loglength]
        [--alength] [-o OUTDIR] [-p PREFIX]
        (--fastq FASTQ | --fastq_rich FASTQ_RICH | --summary SUMMARY | --bam BAM)


Required input argument is (exact) one of these:
    --fastq FASTQ           Data presented is in fastq format exported from fast5
                            files by e.g. poretools.
    --fastq_rich FASTQ_rich Data presented is in fastq format generated by
                            Albacore or MinKNOW with additional information concerning
                            channel and time.
    --bam BAM               Data presented as a sorted bam file.
    --summary SUMMARY       Data is a summary file generated by albacore.
Each of these options can take one or multiple files e.g.
--summary summary1.txt summary2.txt summary3.txt
--bam bam1.txt bam2.txt


Arguments for optional filtering:
    --readtype              Specify read type to extract from summary file
                            Options: 1D (default), 2D
    --maxlength MAXLENGTH   Drop reads longer than length N.
    --downsample DOWNSAMPLE Reduce dataset to N reads by random sampling.
    --drop_outliers         Drop outlier reads with extreme long length.
    --loglength             Logarithmic scaling of lengths in plots.
    --alength               Use aligned read lengths rather than sequenced length (bam mode).


Optional output arguments:
    -o, --outdir OUTDIR     Specify directory in which output has to be created.
    -p, --prefix PREFIX     Specify a prefix to be used for the output files.
    -c, --color COLOR       Specify a color for the plots
                            must be a valid matplotlib color (see color_options.txt)
                            default: green
    -f, --format FORMAT     Specify the output format for the plots,
                            options are: eps, jpg, pdf, png, ps, svg
                            default: png
    --plots PLOTS           Specify which type of bivariate plots have to be made
                            options are: hex, kde, dot (multiple can be specified together)
                            default: all


General arguments:
    -h, --help              show this help message and exit
    -v, --version           Print version and exit.
    -t, --threads THREADS   Max number of threads to be used by the script

Companion scripts

• NanoFilt: filtering and trimming of reads

• NanoStat: statistic summary report of reads or alignments