calculate_average_price

Calculate the average price, based on previous transactions. It requires a SharesPrice struct list.

Note

S1 = 415, P1 = 23.65, S2 = 138, P2 = 16.50

When you need to buy new stocks and you need to log this for accounting purposes, you need to know what the average price was that you paid. You only know the total number of shares you have, called S3. The price is the average of all prices you paid on buy/ sell of all previous transactions.

S1 P1 + S2 P2 = S3 * P3

=> P3 = (S1 P1 + S2 P2) / (S1 + S2)

=> P3 = (415 23.65 + 138 16.50) / 553

=> P3 = 21.8657

Examples

iex> Float.round(LibCalculatorFinance.General.calculate_average_price([%SharesPrice{sp_shares: 415, sp_price: 23.65}, %SharesPrice{sp_shares: 138, sp_price: 16.50}]), 6)
21.865732

calculate_leveraged_contracts

Calculates the number of contracts to buy, according to an algorithm that determines an ideal amount of leverage.

Examples

iex> LibCalculatorFinance.General.calculate_leveraged_contracts(4.0)
5.0

calculate_percentage_of

Calculate what percentage a_value is from a_from_value.

Examples

iex> LibCalculatorFinance.General.calculate_percentage_of(2.0, 50.0)
4.0

convert_from_orig

Returns a price, with an exchange rate applied to it.

Examples

iex> LibCalculatorFinance.General.convert_from_orig(12.0, 0.5)
6.0

convert_to_orig

Returns a price, in the original currency, with the exchange rate no longer applied to it.

Examples

iex> LibCalculatorFinance.General.convert_to_orig(6.0, 0.5)
12.0

version

Returns the version string of the LibCalculatorFinance library.

Examples

iex> LibCalculatorFinance.General.version
"0.0.1"