Variable MathsConst

Type declaration

• erf: ((x: number) => number)

  • • (x): number

    • Error function approximation of Abramowitz and Stegun, formula 7.1.26 in the Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. Although the approximation is only valid for x ≥ 0, because erf(x) is an odd function, erf(x) = −erf(−x) and negative values are supported.

      Parameters

      • x: number

      Returns number

• interpolate: ((xySequence: XySequence, value: number) => number)

  • • (xySequence, value): number

    • Interpolate.

      Parameters

      • xySequence: XySequence

        The Xy sequence
      • value: number

        The value to interpolate at.

      Returns number

• normalCcdf: ((μ: number, σ: number, x: number) => number)

  • • (μ, σ, x): number

    • Normal complementary cumulative distribution function.

      Parameters

      • μ: number

        mean
      • σ: number

        standard deviation
      • x: number

        variate

      Returns number

• responseSpectrum: ((hazards: Map<Imt, XySequence>, returnPeriod: number) => XySequence)

  • • (hazards, returnPeriod): XySequence

    • Calculate the response sepectrum for each IMT.

      Parameters

      • hazards: Map<Imt, XySequence>

        The hazard curves by imt
      • returnPeriod: number

        The return period (in years) to calculate at

      Returns XySequence

• round: ((value: number, scale: number) => number)

  • • (value, scale): number

    • Round a number to specific format

      Parameters

      • value: number

        Value to round
      • scale: number

        Format scale

      Returns number