Computation functions

Statistics

`accumulate()`	Add up the values per field in a `Fieldset`
`average()`	Compute the average per field in a `Fieldset`
`average_ew()`	Compute the zonal averages for each field in a `Fieldset`
`average_ns()`	Compute the meridional averages for each field in a `Fieldset`
`corr_a()`	Compute the area-weighted correlation for each field in a `Fieldset`
`covar()`	Return the covariance of two `Fieldset` objects
`covar_a()`	Compute the area-weighted covariance for each field in a `Fieldset`
`deacc()`	De-accumulate values in a `Fieldset`
`frequencies()`	Compute the frequencies of a `Fieldset`
`integrate()`	Compute the average weighted by the gridcell area for each field in `Fieldset`
`max()`	Maximum
`maxvalue()`	Maximum value of a `Fieldset`
`mean()`	Return the mean of the values in a `Fieldset` or `Geopoints`
`mean_ew()`	Generate a `Fieldset` out of East-West means
`min()`	Minimum
`minvalue()`	Minimum value of a `Fieldset` or `Geopoints`
`percentile()`	Compute a set of percentiles in a `Fieldset`
`rms()`	Compute he pointwise root mean square for `Fieldset`
`rms_a()`	Compute the area-weighted root mean square for `Fieldset`
`stdev()`	Return the standard deviation of all the fields in a `Fieldset`
`stdev_a()`	Compute the area-weighted standard deviation for each field in a `Fieldset`
`sum()`	Compute the sum of the values in a `Fieldset` or `Geopoints`
`var()`	Return the variance of all the fields in a `Fieldset`
`var_a()`	Compute the area-weighted variance for each field in a `Fieldset`

Geographic

`bearing()`	Compute the bearings with respect to a reference in a `Fieldset` point
`convolve()`	Perform spatial convolution on a `Fieldset`
`coslat()`	Generate a field with the cosine of the latitudes in a `Fieldset`
`distance()`	Compute the distances in a `Fieldset` or `Geopoints` to a reference point
`geosort()`	Sort a `Geopoints` North to South and West to East
`grid_cell_area()`	Compute the grid cell area in a `Fieldset`
`interpolate()`	Interpolate `Fieldset` values to the specified location
`latitudes()`	Return the latitudes of a `Fieldset` or `Geopoints`
`longitudes()`	Return the longitudes from a `Fieldset` or `Geopoints`
`nearest_gridpoint()`	Return the nearest grid point value from a `Fieldset`
`nearest_gridpoint_info()`	Return the nearest grid point value from a `Fieldset`
`offset()`	Offsets the locations of `Geopoints`
`regrid()`	Regridding and derivatives
`reprojection()`	Repoject satellite view GRIB data onto a latlon grid
`sinlat()`	Generate a field with the cosine of the latitudes in a `Fieldset`
`smooth_gaussian()`	Perform spatial smoothing on a `Fieldset`
`smooth_n_points()`	Perform spatial smoothing on a `Fieldset`
`solar_zenith_angle()`	Compute the solar zenith angle for a `Fieldset`
`subsample()`	Filter the points of the first `Geopoints` that exist in the second one
`surrounding_points_indexes()`	Return the indexes of the four surrounding grid points in a `Fieldset`
`tanlat()`	Generate a field with the tangent of the latitudes in a `Fieldset`

Masking

`bitmap()`	Convert numbers to missing values in a `Fieldset`
`mask()`	Generate masks for a `Fieldset` or `Geopoints`
`nobitmap()`	Convert missing values to numbers in a `Fieldset`
`poly_mask()`	Generate polygon masks for a `Fieldset`
`remove_missing_latlons()`	Removing missing lat/lons form a `Geopoints`
`remove_missing_values()`	Remove missing values from a `Geopoints`
`rmask()`	Generate masks based on a radius around a point for `Fieldset`

Wind

`absolute_vorticity()`	Compute the absolute vorticity from a relative vorticity `Fieldset`
`direction()`	Compute the wind direction
`divrot()`	Compute the rotational wind from a spectral vorticity `Fieldset`
`divwind()`	Compute the divergent wind from a spectral divergence `Fieldset`
`geostrophic_wind()`	Compute the geostrophic wind on pressure levels in a `Fieldset`
`speed()`	Compute the wind speed from a u and v component `Fieldset`
`streamfn()`	Compute the stream function from a spectral vorticity `Fieldset`
`uvwind()`	Compute u/v from a spectral vorticty and divegence `Fieldset`
`velpot()`	Compute the velocity potential from a spectral divergence `Fieldset`
`xy_from_polar()`	Compute the x and y components from polar components

Vertical

`geopotential_from_height()`	Compute the geopotential from geometric height
`height_from_geopotential()`	Compute the geometric height from geopotential
`mcross_sect()`	Generate data for the cross section view
`mhovmoeller_area()`	Generate data for the Hovmoeller area mode
`mhovmoeller_expand()`	Generate data for the Hovmoeller expand mode
`mhovmoeller_line()`	Generate data for the Hovmoeller line mode
`mhovmoeller_vertical()`	Generate data for the Hovmoeller vertical mode
`ml_to_hl()`	Interpolate a model level `Fieldset` to height levels
`mvert_prof()`	Generate data for the vertical profile view
`mvl_geopotential_on_ml()`	Compute the geopotential on model levels for a `Fieldset`
`mvl_ml2hPa()`	Interpolate a `Fieldset` on model levels to pressure levels (in hPa)
`mxs_average()`	Generate data for the average view
`pl_to_hl()`	Interpolate a pressure level `Fieldset` to height levels
`pl_to_pl()`	Interpolate pressure level fields to pressure levels
`pressure()`	Compute the pressure on model levels in a `Fieldset` (deprecated)
`pressure_derivative()`	Compute the verical pressure derivative
`q_vector()`	Compute the Q-vector
`static_stability()`	Compute the static stability
`thickness()`	Compute the pressure thickness on model levels in a `Fieldset` (deprecated)
`unipressure()`	Compute the pressure on model levels in a `Fieldset`
`unithickness()`	Compute the pressure thickness of model levels in a `Fieldset`
`univertint()`	Perform a vertical integration for a `Fieldset`
`vertint()`	Perform a vertical integration for a `Fieldset` (deprecated)
`w_from_omega()`	Compute the vertical velocity in m/s from pressure velocity

Thermodynamics

`dewpoint_from_relative_humidity()`	Compute the dewpoint for a given temperature and relative humidity
`dewpoint_from_specific_humidity()`	Compute the dewpoint for a given specific humidity and pressure
`eqpott_m()`	Compute the equivalent potential temperature on model levels
`eqpott_p()`	Compute the equivalent potential temperature on pressure levels
`lifted_condensation_level()`	Compute the Lifted Condensation Level (LCL) using the parcel method
`mixing_ratio()`	Compute the mixing ratio from specific humidity
`potential_temperature()`	Compute the potential temperature for a given temperature and pressure
`pott_m()`	Compute the potential temperature on model levels
`pott_p()`	Compute the potential temperature on pressure levels
`relative_humidity_from_dewpoint()`	Compute the relative humidity for a given temperature and dewpoint
`relative_humidity_from_specific_humidity()`	Compute the relative humidity from specific humidity
`relhum()`	Compute the relative humidity from specific humidity
`saturation_mixing_ratio()`	Compute the saturation mixing ratio for a given temperature and pressure
`saturation_vapour_pressure()`	Compute the saturation vapour pressure for a given temperature
`seqpott_m()`	Compute the saturation equivalent potential temperature on model levels
`seqpott_p()`	Compute the saturation equivalent potential temperature on pressure levels
`specific_humidity_from_dewpoint()`	Compute the specific humidity for a given dewpoint and pressure
`temperature_from_potential_temperature()`	Compute the temperature from potential tempearture and pressure
`thermo_bufr()`	Generate thermodynamical profile from `Bufr`
`thermo_data_info()`	Extracts information from a thermo data object
`thermo_data_values()`	Extracts data and metadata from a thermo data object
`thermo_grib()`	Generate thermodynamical profile from GRIB
`thermo_parcel_area()`	Return a set of coloured areas from a thermo parcel path
`thermo_parcel_path()`	Compute the path of an ascending thermodynamic parcel
`vapour_pressure()`	Compute the vapour pressure for a given specific humidity and pressure
`virtual_temperature()`	Compute the virtual temperature for a given temperature and specific humidity

Calculus

`divergence()`	Compute the horizontal divergence of a vector `Fieldset`
`first_derivative_x()`	Compute first West-East derivative of a `Fieldset`
`first_derivative_y()`	Compute first South-North derivative of a `Fieldset`
`gradient()`	Compute horizontal gradient of a `Fieldset`
`integral()`	Compute the surface integral of a `Fieldset`
`laplacian()`	Compute the horizontal Laplacian of `Fieldset`
`regrid()`	Regridding and derivatives
`second_derivative_x()`	Compute the second West-East derivative of a `Fieldset`
`second_derivative_y()`	Compute the econd South-North derivative of a `Fieldset`
`shear_deformation()`	Compute the shear deformation of a vector `Fieldset`
`stretch_deformation()`	Compute the stretch deformation of a vector `Fieldset`
`vorticity()`	Compute the relative vorticity of a vector `Fieldset`

Basic mathematics

`abs()`	Compute the absolute value
`acos()`	Compute the arc cosine
`asin()`	Compute the arc sine
`atan()`	Compute the arc tangent
`atan2()`	Compute the arc tangent of 2 `Fieldset` objects
`cos()`	Compute the cosine
`div()`	Compute the integer part of a divison
`exp()`	Compute the exponential
`intbits()`	Return ranges of bits
`log()`	Compute the natural logarithm
`log10()`	Compute the base 10 logarithm
`mod()`	Compute the integer remainder of a divison
`sgn()`	Compute the sign
`sin()`	Compute the sine
`sqrt()`	Compute the square root
`tan()`	Compute the tangent