triqs.utility.utilities.TimePt

class triqs.utility.utilities.TimePt

Bases: object

A point in imaginary time, \(\tau_n \in [0, \beta]\), stored on a very fine integer grid.

Each time point is identified by an integer position \(n \in [0, N_\mathrm{max}]\) of type uint64_t and the inverse temperature \(\beta\). Its floating-point value is \(\beta * n / N_\mathrm{max}\).

Comparing two time points reduces to integer comparison, which avoids the well-known pitfalls of floating-point equality.

Various arithmetic operations are defined between time points and between time points and scalar double values.

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Dispatched C++ constructor(s).

[1] ()

[2] (n_: int, beta_: float)

[1] Default constructor creates the point \(\tau_0\) for \(\beta = 0\).

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[2] Construct a point \(\tau_n\) from an integer grid position and the inverse temperature.

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Parameters:

n_int

Integer position \(n \in [0, N_\text{max}]\) on the grid.

beta_float

Inverse temperature \(\beta\).