podpac.algorithm.Arithmetic

class podpac.algorithm.Arithmetic(**kwargs)

Bases: podpac.core.algorithm.generic.GenericInputs

Create a simple point-by-point computation using named input nodes.

Examples

a = SinCoords() b = Arange() arith = Arithmetic(A=a, B=b, eqn = ‘A * B + {offset}’, params={‘offset’: 1})

Alternative Constructors

from_definition(definition)	Create podpac Node from a dictionary definition.
from_json(s)	Create podpac Node from a JSON definition.

Methods

__init__(**kwargs)	Do not overwrite me
algorithm(inputs)	Compute the algorithms equation
create_output_array(coords[, data, attrs])	Initialize an output data array
eval(coordinates, **kwargs)	Evaluate the node at the given coordinates.
eval_group(group)	Evaluate the node for each of the coordinates in the group.
find_coordinates()	Get the available coordinates for the inputs to the Node.
from_url(url)	Create podpac Node from a WMS/WCS request.
get_cache(key[, coordinates])	Get cached data for this node.
has_cache(key[, coordinates])	Check for cached data for this node.
init()
load(path)	Create podpac Node from file.
put_cache(data, key[, coordinates, expires, …])	Cache data for this node.
rem_cache(key[, coordinates, mode])	Clear cached data for this node.
save(path)	Write node to file.
trait_defaults(*names, **metadata)	Return a trait’s default value or a dictionary of them
trait_has_value(name)	Returns True if the specified trait has a value.
trait_is_defined(name)
trait_values(**metadata)	A dict of trait names and their values.

Attributes

attrs	List of node attributes
base_ref	Default reference/name in node definitions
cache_ctrl	A trait whose value must be an instance of a specified class.
cache_output	A boolean (True, False) trait.
definition
dtype	A trait which allows any value.
eqn	A trait for unicode strings.
force_eval	A boolean (True, False) trait.
hash	hash for this node, used in caching and to determine equality.
inputs	An instance of a Python dict.
json	Definition for this node in JSON format.
json_pretty	Definition for this node in JSON format, with indentation suitable for display.
output	A trait for unicode strings.
outputs	An instance of a Python list.
params	An instance of a Python dict.
style	A trait whose value must be an instance of a specified class.
units	A trait for unicode strings.

Members

__init__(**kwargs)

Do not overwrite me

algorithm(inputs)

Compute the algorithms equation

inputs

Evaluated outputs of the input nodes. The keys are the attribute names.

Type

dict

Returns

Description

Return type

UnitsDataArray

eqn

A trait for unicode strings.

init()

params

An instance of a Python dict.

One or more traits can be passed to the constructor to validate the keys and/or values of the dict. If you need more detailed validation, you may use a custom validator method.

Changed in version 5.0: Added key_trait for validating dict keys.

Changed in version 5.0: Deprecated ambiguous trait, traits args in favor of value_trait, per_key_traits.