ursatoro/util

Types

pub type IndicatorError {
  InsufficientData(required: Int, got: Int)
  InvalidPeriod(period: Int)
  DivisionByZero
}

InsufficientData(required: Int, got: Int)

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pub fn bd_abs(
  value: bigdecimal.BigDecimal,
) -> bigdecimal.BigDecimal

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pub fn bd_max(
  a: bigdecimal.BigDecimal,
  b: bigdecimal.BigDecimal,
) -> bigdecimal.BigDecimal

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pub fn bd_mean(
  values: List(bigdecimal.BigDecimal),
) -> Result(bigdecimal.BigDecimal, IndicatorError)

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pub fn bd_min(
  a: bigdecimal.BigDecimal,
  b: bigdecimal.BigDecimal,
) -> bigdecimal.BigDecimal

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pub fn bd_sqrt(
  value: bigdecimal.BigDecimal,
) -> bigdecimal.BigDecimal

Square root via Newton’s method (Babylonian method). Returns zero for zero/negative inputs.

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pub fn bd_stddev_population(
  values: List(bigdecimal.BigDecimal),
) -> Result(bigdecimal.BigDecimal, IndicatorError)

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pub fn bd_sum(
  values: List(bigdecimal.BigDecimal),
) -> bigdecimal.BigDecimal

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pub fn bd_to_float(value: bigdecimal.BigDecimal) -> Float

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pub fn bds_to_floats(
  values: List(bigdecimal.BigDecimal),
) -> List(Float)

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pub fn float_to_bd(value: Float) -> bigdecimal.BigDecimal

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pub fn hundred() -> bigdecimal.BigDecimal

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pub fn int_to_bd(value: Int) -> bigdecimal.BigDecimal

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pub fn safe_divide(
  dividend: bigdecimal.BigDecimal,
  divisor: bigdecimal.BigDecimal,
) -> Result(bigdecimal.BigDecimal, IndicatorError)

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pub fn sma_values(
  values: List(bigdecimal.BigDecimal),
  period: Int,
) -> Result(List(bigdecimal.BigDecimal), IndicatorError)

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pub fn true_range(
  prev: candle.Candle,
  current: candle.Candle,
) -> bigdecimal.BigDecimal

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pub fn validate_length(
  items: List(a),
  required: Int,
) -> Result(Nil, IndicatorError)

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pub fn validate_period(
  period: Int,
) -> Result(Nil, IndicatorError)