VertexFrame tally

---

tally(self, sample_col, count_val)

[BETA] Count number of times a value is seen.

Parameters:

sample_col : unicode

The name of the column from which to compute the cumulative count.

count_val : unicode

The column value to be used for the counts.

A cumulative count is computed by sequentially stepping through the rows, observing the column values and keeping track of the number of times the specified count_value has been seen.

Examples

Consider Frame my_frame, which accesses a frame that contains a single column named obs:

>>> my_frame.inspect()
[#]  obs
========
[0]    0
[1]    1
[2]    2
[3]    0
[4]    1
[5]    2

The cumulative percent count for column obs is obtained by:

>>> my_frame.tally("obs", "1")
[===Job Progress===]

The Frame my_frame accesses the original frame that now contains two columns, obs that contains the original column values, and obsCumulativePercentCount that contains the cumulative percent count:

>>> my_frame.inspect()
[#]  obs  obs_tally
===================
[0]    0        0.0
[1]    1        1.0
[2]    2        1.0
[3]    0        1.0
[4]    1        2.0
[5]    2        2.0