Subcommand: simulate

Synopsis: Create a file with simulated random frequency data.

Usage: grenedalf simulate [options]

Required options:

• --coverages
• --length

Documentation for grenedalf v0.2.0

Options

Settings

--format

TEXT:{pileup,sync}=pileup
Select the output file format, either (m)pileup, or PoPoolation2 sync.

--random-seed

UINT=0
Set the random seed for generating values, which allows reproducible results. If not provided, the system clock is used to obtain a random seed.

Samples

--coverages

TEXT
Required. Coverages of the samples to simulate, as a comma- or tab-separated list. The coverage of each sample is used at the total count per position to randomly distribute across nucleotides. Per sample, the list can either contain a single number, which will be used as the coverage for that sample at each position, or it can be two numbers separated by a slash, which will be used as min/max to generate random coverage at each position. The length of this list is also used to determine the number of samples to simulate.

Genome

--chromosome

TEXT=A
Name of the chromosome. This is simply used as the first column in the output file. At the moment, only one chromosome is supported.

--mutation-rate

FLOAT:(FLOAT in [0 - 1]) AND (POSITIVE)=1e-08 Excludes: --mutation-count
Mutation rate to simulate. This rate times the --length is used as the number of mutations to generate in total (which can alternatively be directly provided via --mutation-count).

--mutation-count

UINT=0 Excludes: --mutation-rate
Number of mutations to simulate in total across the chromosome, spread across the --length.

--length

UINT=0
Required. Total length of the chromosome to simulate. Mutations are spread across this length.

--omit-invariant-positions

FLAG
If set, only write the mutated positions in the output file. Note that these are not standard (m)pileup or sync files any more; still this option might be useful.

Pileup

--with-quality-scores

FLAG
If set, phred-scaled quality scores are written when simulating an (m)pileup file, using the --min-phred-score and --max-phred-score settings. Ignored otherwise.

--min-phred-score

UINT:UINT in [0 - 90]=10
Minimum phred score to use when simulating an (m)pileup file. Ignored otherwise.

--max-phred-score

UINT:UINT in [0 - 90]=40
Maximum phred score to use when simulating an (m)pileup file. Ignored otherwise.

Output

--out-dir

TEXT=.
Directory to write files to

--file-prefix

TEXT
File prefix for output files. Most grenedalf commands use the command name as the base name for file output. This option amends the base name, to distinguish runs with different data.

--file-suffix

TEXT
File suffix for output files. Most grenedalf commands use the command name as the base name for file output. This option amends the base name, to distinguish runs with different data.

--compress

FLAG
If set, compress the output files using gzip. Output file extensions are automatically extended by .gz.

Global Options

--allow-file-overwriting

FLAG
Allow to overwrite existing output files instead of aborting the command.

--verbose

FLAG
Produce more verbose output.

--threads

UINT
Number of threads to use for calculations. If not set, we guess a reasonable number of threads, by looking at the environmental variables (1) OMP_NUM_THREADS (OpenMP) and (2) SLURM_CPUS_PER_TASK (slurm), as well as (3) the hardware concurrency, taking hyperthreads into account, in the given order of precedence.

--log-file

TEXT
Write all output to a log file, in addition to standard output to the terminal.

Citation

When using this method, please do not forget to cite

Lucas Czech, Jeffrey Spence, Moises Exposito-Alonso. grenedalf: population genetic statistics for the next generation of pool sequencing. arXiv, 2023. doi:arXiv:2306.11622