exception getdist.densities.DensitiesError[source]
class getdist.densities.Density1D(x, P=None, view_ranges=None)[source]

Class for 1D marginalized densities, inheriting from GridDensity. You can call it like a InterpolatedUnivariateSpline obect to get interpolated values, or call Prob.

  • x – array of x values

  • P – array of densities at x values

  • view_ranges – optional range for viewing density

Prob(x, derivative=0)[source]

Calculate density at position x by interpolation in the density grid

  • x – x value

  • derivative – optional order of derivative to calculate (default: no derivative)


P(x) density value (or array if x is an array)


Get min, max bounds (from view_ranges if set)

getLimits(p, interpGrid=None, accuracy_factor=None)[source]

Get parameter equal-density confidence limits (a credible interval). If the density is bounded, may only have a one-tail limit.

  • p – list of limits to calculate, e.g. [0.68, 0.95]

  • interpGrid – optional pre-computed cache

  • accuracy_factor – parameter to boost default accuracy for fine sampling


list of (min, max, has_min, has_top) values where has_min and has_top are True or False depending on whether lower and upper limit exists

class getdist.densities.Density2D(x, y, P=None, view_ranges=None)[source]

Class for 2D marginalized densities, inheriting from GridDensity. You can call it like a RectBivariateSpline object to get interpolated values.

  • x – array of x values

  • y – array of y values

  • P – 2D array of density values at x, y

  • view_ranges – optional ranges for viewing density

Prob(x, y, grid=False)[source]

Evaluate density at x,y using interpolation

  • x – x value or array

  • y – y value or array

  • grid – whether to make a grid, see RectBivariateSpline. Default False.

class getdist.densities.DensityND(xs, P=None, view_ranges=None)[source]

Class for ND marginalized densities, inheriting from GridDensity and LinearNDInterpolator.

This is not well tested recently.

  • xs – list of arrays of x values

  • P – ND array of density values at xs

  • view_ranges – optional ranges for viewing density


Evaluate density at x,y,z using interpolation

class getdist.densities.GridDensity[source]

Base class for probability density grids (normalized or not)


P – array of density values


Get bounds in order x, y, z..


list of (min,max) values

getContourLevels(contours=(0.68, 0.95))[source]

Get contour levels


contours – list of confidence limits to get (default [0.68, 0.95])


list of contour levels

normalize(by='integral', in_place=False)[source]

Normalize the density grid

  • by – ‘integral’ for standard normalization, or ‘max’, to normalize so the maximum value is unity

  • in_place – if True, normalize in place, otherwise make copy (in case self.P is used elsewhere)


Set the density grid values


P – numpy array of density values

getdist.densities.getContourLevels(inbins, contours=(0.68, 0.95), missing_norm=0, half_edge=True)[source]

Get contour levels enclosing “contours” fraction of the probability, for any dimension bins array

  • inbins – binned density.

  • contours – list or tuple of confidence contours to calculate, default [0.68, 0.95]

  • missing_norm – accounts of any points not included in inbins (e.g. points in far tails that are not in inbins)

  • half_edge – If True, edge bins are only half integrated over in each direction.


list of density levels