ó mÜJ]c@`sÑdZddlmZmZmZmZddlZejeƒZ ddl m Z ddl m Z mZmZddlmZdZe d efd „ƒYƒZd efd„ƒYZdefd„ƒYZdS(ug Represent array expressions to be computed on the client (browser) side by BokehJS. Expression models are useful as ``DataSpec`` values when it is desired that the array values be computed in the browser: .. code-block:: python p.circle(x={'expr': some_expression}, ...) or using the ``expr`` convenience function: .. code-block:: python from bokeh.core.properties import expr p.circle(x=expr(some_expression), ...) In this case, the values of the ``x`` coordinates will be computed in the browser by the JavaScript implementation of ``some_expression`` using a ``ColumnDataSource`` as input. i(tabsolute_importtdivisiontprint_functiontunicode_literalsNi(tabstract(tBooltSeqtString(tModeluCumSumu ExpressionuStackt ExpressioncB`seZdZRS(uÈ Base class for ``Expression`` models that represent a computation to be carried out on the client-side. JavaScript implementations should implement the following methods: .. code-block:: coffeescript v_compute: (source) -> # compute an array of values .. note:: If you wish for results to be cached per source and updated only if the source changes, implement ``_v_compute: (source)`` instead. (t__name__t __module__t__doc__(((s7lib/python2.7/site-packages/bokeh/models/expressions.pyR BstCumSumcB`s2eZdZeddƒZededdƒZRS(us An expression for generating arrays by cumulatively summing a single column from a ``ColumnDataSource``. thelpuW The name of a ``ColumnDataSource`` column to cumulatively sum for new values. tdefaultuÚ Whether to include zero at the start of the result. Note that the length of the result is always the same as the input column. Therefore if this property is True, then the last value of the column will not be included in the sum. .. code-block:: python source = ColumnDataSource(data=dict(foo=[1, 2, 3, 4])) CumSum(field='foo') # -> [1, 3, 6, 10] CumSum(field='foo', include_zero=True) # -> [0, 1, 3, 6] (R R R RtfieldRtFalset include_zero(((s7lib/python2.7/site-packages/bokeh/models/expressions.pyR Us   tStackcB`s&eZdZeedgddƒZRS(u¿ An expression for generating arrays by summing different columns from a ``ColumnDataSource``. This expression is useful for implementing stacked bar charts at a low level. RRu= A sequence of fields from a ``ColumnDataSource`` to sum (elementwise). For example: .. code-block:: python Stack(fields=['sales', 'marketing']) Will compute an array of values (in the browser) by adding the elements of the ``'sales'`` and ``'marketing'`` columns of a data source. (R R R RRtfields(((s7lib/python2.7/site-packages/bokeh/models/expressions.pyRqs (uCumSumu ExpressionuStack(R t __future__RRRRtloggingt getLoggerR tlogtcore.has_propsRtcore.propertiesRRRtmodelRt__all__R R R(((s7lib/python2.7/site-packages/bokeh/models/expressions.pyts"