Crash due to complex rate of return when investment value goes down.

[muonzoo]

When the price goes down post investment, beangrow crashes with complex type error (sum of real and complex).

An investment that has the price drop after acquisition results in a complex rate of return that cannot be summed.

Removing the 9.00 USD Price on line 22 stops the crash.

Output:

INFO    : Reading ledger: bug.bean
INFO    : Processing account: Assets:US:Investments:XYZ
INFO    : Writing details file: bug-returns/investments/Assets_US_Investments_XYZ.org
INFO    : Writing returns dir for currency.XYZ: bug-returns/groups/currency.XYZ
DEBUG   : top of Axes not in the figure, so title not moved
DEBUG   : top of Axes not in the figure, so title not moved
Traceback (most recent call last):
  File ".../scm/gh/beangrow/beangrow/compute_returns.py", line 105, in <module>
    main()
  File ".../scm/gh/beangrow/beangrow/compute_returns.py", line 86, in main
    pricer = reports.generate_reports(account_data_map, config,
  File ".../scm/gh/beangrow/beangrow/reports.py", line 551, in generate_reports
    func()
  File ".../scm/gh/beangrow/beangrow/reports.py", line 218, in write_returns_html
    plots = plot_flows(
  File ".../scm/gh/beangrow/beangrow/reports.py", line 415, in plot_flows
    gamounts[-remaining_days:] += gflow
numpy.core._exceptions._UFuncOutputCastingError: Cannot cast ufunc 'add' output from dtype('complex128') to dtype('float64') with casting rule 'same_kind'

Version:

Beancount 2.3.4 (git:0003608e; 2021-12-05)

==> bug.bean <==

; -*- mode: beancount; fill-column: 9999; -*-

2000-01-01 commodity USD
2000-01-01 commodity XYZ

2000-01-01 open Equity:Opening-Balances
2000-01-01 open Assets:US:Investments:XYZ XYZ
2000-01-01 open Assets:US:Investments:Cash USD

2022-02-07 price XYZ               9.950 USD

2022-01-01 * "Opening"
  Equity:Opening-Balances     -10,000.00 USD
  Assets:US:Investments:Cash  10,000.000 USD

2022-02-10 * " Make Investment"
  Assets:US:Investments:XYZ         1000 XYZ { 10.00 USD, 2022-02-10 }
  Assets:US:Investments:Cash  -10,000.00 USD
  closing: TRUE

; Change this to > 10.00 USD and it will not crash.
2022-02-14 price XYZ                9.00 USD

2022-02-28 price XYZ               11.00 USD

==> bug.conf <==

investments {
  investment {
    currency: "XYZ"
    asset_account: "Assets:US:Investments:XYZ"
    cash_accounts: "Assets:US:Investments:Cash"
  }
}
groups {
  group {
    name: "currency.XYZ"
    investment: "Assets:US:Investments:XYZ"
  }
}

Bean Report Print output:

; - bean-report bug.bean print
2000-01-01 open Equity:Opening-Balances
2000-01-01 open Assets:US:Investments:XYZ                       XYZ
2000-01-01 open Assets:US:Investments:Cash                      USD

2000-01-01 commodity USD

2000-01-01 commodity XYZ

2022-01-01 * "Opening"
  Equity:Opening-Balances     -10000.00 USD
  Assets:US:Investments:Cash  10000.000 USD

2022-02-07 price XYZ                                 9.950 USD

2022-02-10 * " Make Investment"
  Assets:US:Investments:XYZ        1000 XYZ {10.00 USD, 2022-02-10}
  Assets:US:Investments:Cash  -10000.00 USD
    closing: TRUE

2022-02-14 price XYZ                                  9.00 USD
2022-02-28 price XYZ                                 11.00 USD