Packages

chi2fit

2.1.5
3.1.0 3.0.1 3.0.0 2.1.7 2.1.6 2.1.5 retired 2.1.4 retired 2.1.3 retired 2.1.2 retired 2.1.1 retired 2.1.0 retired 2.0.2 2.0.1 2.0.0 1.3.0 1.1.0 1.0.3 1.0.2 1.0.1 1.0.0 1.0.0-beta.11 1.0.0-beta.10 1.0.0-beta.9 1.0.0-beta.8 1.0.0-beta.7 1.0.0-beta.6 1.0.0-beta.5 1.0.0-beta.4 1.0.0-beta.3 1.0.0-beta.2 1.0.0-beta.1 1.0.0-beta 1.0.0-alpha 0.9.5 0.9.4 0.9.3 0.9.2 0.9.1 0.9.0 0.8.11 0.8.10 0.8.9 0.8.8 0.8.7-alpha.2 0.8.7-alpha 0.8.6 0.8.5 0.8.4 0.8.3 0.8.2 0.8.1 0.8.0 0.7.8 0.7.7 0.7.6 0.7.5 0.7.4 0.7.3 0.7.3-1 0.7.2 0.7.1 0.7.0 0.6.7 0.6.6 0.6.5 0.6.3 0.6.0 0.5.2 0.5.1 0.5.0 0.4.0 0.3.1 0.3.0 0.2.0

Provides functions for fast matrix inversion, creation of empirical CDF from sample data including handling of asymmetric errors, and fitting to a funtion using chi-squared. The fitting procedure return the full covariance matrix describing the fitted parameters.

Retired package: Release invalid - Invalid; split into chi2fit and chi2fit_nb
HexDocs

Current section

Files

Jump to
Readme
74 Versions
4 Dependencies
1 Dependant
Files
Activity
chi2fit lib csv.ex
Raw

lib/csv.ex 

defmodule Chi2fit.CSV do



  # Copyright 2015-2021 Pieter Rijken

  #

  # Licensed under the Apache License, Version 2.0 (the "License");

  # you may not use this file except in compliance with the License.

  # You may obtain a copy of the License at

  #

  #     http://www.apache.org/licenses/LICENSE-2.0

  #

  # Unless required by applicable law or agreed to in writing, software

  # distributed under the License is distributed on an "AS IS" BASIS,

  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  # See the License for the specific language governing permissions and

  # limitations under the License.



  alias Timex.Format.DateTime.Formatters



  @doc ~S"""

  Reads CSV data, extracts one column, and returns it as a list of `NaiveDateTime`.

  

  ## Examples

  

      iex> csv = ["Done","2019/05/01","2019/06/01"] |> Stream.map(& &1)

      ...> csv_to_list csv, "Done", header?: true

      [~N[2019-06-01 00:00:00], ~N[2019-05-01 00:00:00]]

  

      iex> csv = ["Done","2019/May/01","2019/Jun/01"] |> Stream.map(& &1)

      ...> csv_to_list csv, "Done", header?: true, format: "{YYYY}/{Mshort}/{0D}"

      [~N[2019-06-01 00:00:00], ~N[2019-05-01 00:00:00]]

  

      iex> csv = ["Done","2019/May/01","2019/06/01"] |> Stream.map(& &1)

      ...> csv_to_list csv, "Done", header?: true, format: "{YYYY}/{Mshort}/{0D}"

      [~N[2019-05-01 00:00:00]]

  

      iex> csv = ["Done","2019/May/01","2019/06/01"] |> Stream.map(& &1)

      ...> csv_to_list csv, "Done", header?: true, format: ["{YYYY}/{Mshort}/{0D}","{YYYY}/{0M}/{0D}"]

      [~N[2019-06-01 00:00:00], ~N[2019-05-01 00:00:00]]



      iex> csv = ["Done","2019/May/01","2019/Jun/01"] |> Stream.map(& &1)

      ...> csv_to_list csv, "Done", header?: true, format: ["%Y/%b/%d"], parser: :strftime

      [~N[2019-06-01 00:00:00], ~N[2019-05-01 00:00:00]]



  """

  @spec csv_to_list(csvcata :: Enumerable.t, key :: String.t, options :: Keyword.t) :: [NaiveDateTime.t]

  def csv_to_list(csvdata, key, options \\ []) do

    header? = options[:header?] || false

    format = options[:format] || "{YYYY}/{0M}/{0D}"

    separator = options[:separator] || ?,

    parser = case options[:parser] do

      :strftime -> Formatters.Strftime

      :default -> Formatters.Default

      nil -> Formatters.Default

      _ -> Formatters.Default

    end



    formats = if is_list(format), do: format, else: [format]



    csvdata

    |> CSV.decode!(headers: header?, separator: separator)

    |> Stream.filter(& Map.fetch!(&1, key) != "")

    |> Stream.map(& Map.fetch!(&1, key))

    |> Stream.map(fn t -> Enum.reduce_while(formats,nil,fn f,_acc ->

        case Timex.parse(t, f, parser) do

          {:ok,n} -> {:halt,n}

          {:error,_msg} -> {:cont,nil}

        end

      end)

    end)

    |> Stream.filter(& &1 != nil)

    |> Enum.sort(& NaiveDateTime.compare(&1,&2) === :gt)

  end



end