R: Maps a function over the results of a registry by using...

batchMapResults {BatchJobs} | R Documentation

## Maps a function over the results of a registry by using batchMap.

### Description

Maps a function over the results of a registry by using batchMap.

### Usage

    batchMapResults(reg, reg2, fun, ..., ids, part = NA_character_,
      more.args = list())

### Arguments

`reg` | [`Registry`] Registry whose results should be mapped by `fun`.
`reg2` | [`Registry`] Empty registry that should store the job for the mapping.
`fun` | [`function(job, res, ...)`] Function to map over results of `reg`. Further arguments come from ... of `batchMapResults` and `more.args`.
`...` | [any] Furher arguments to vectorize over (list or vector). Must all be the same length as number of results in `reg`.
`ids` | [`integer`] Ids of jobs whose results should be mapped with `fun`. Default is all jobs.
`part` | [`character`] Only useful for multiple result files, then defines which result file part(s) should be loaded. `NA` means all parts are loaded, which is the default.
`more.args` | [`list`] A list of other arguments passed to `fun`. Default is empty list.

### Value

Vector of type `integer` with job ids.

### Examples

    reg1 = makeRegistry(id = "BatchJobsExample1", file.dir = tempfile(), seed = 123)
    # square some numbers
    f = function(x) x^2
    batchMap(reg1, f, 1:10)

    # submit jobs and wait for the jobs to finish
    submitJobs(reg1)
    waitForJobs(reg1)

    # look at results
    reduceResults(reg1, fun = function(aggr,job,res) c(aggr, res))

    reg2 = makeRegistry(id = "BatchJobsExample2", file.dir = tempfile(), seed = 123)

    # define function to tranform results, we simply do the inverse of the squaring
    g = function(job, res) sqrt(res)
    batchMapResults(reg1, reg2, fun = g)

    # submit jobs and wait for the jobs to finish
    submitJobs(reg2)
    waitForJobs(reg2)

    # check results
    reduceResults(reg2, fun = function(aggr,job,res) c(aggr, res))

[Package BatchJobs version 1.6 Index]