Databases
StackOverflow2013
Postsdbo
POCounting daily events on Pandas Time series
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POCounting daily events on Pandas Time series
    primarykey
    data
    text
    <p>Hi I have a time series and would like to count how many events I have per day(i.e. rows in the table within a day). The command I'd like to use is:</p> <pre><code>ts.resample('D', how='count') </code></pre> <p>but "count" is not a valid aggregation function for time series, I suppose.</p> <p>just to clarify, here is a sample of the dataframe:</p> <pre><code>0 2008-02-22 03:43:00 1 2008-02-22 03:43:00 2 2010-08-05 06:48:00 3 2006-02-07 06:40:00 4 2005-06-06 05:04:00 5 2008-04-17 02:11:00 6 2012-05-12 06:46:00 7 2004-05-17 08:42:00 8 2004-08-02 05:02:00 9 2008-03-26 03:53:00 Name: Data_Hora, dtype: datetime64[ns] </code></pre> <p>and this is the error I am getting:</p> <pre><code>ts.resample('D').count() --------------------------------------------------------------------------- TypeError Traceback (most recent call last) &lt;ipython-input-42-86643e21ce18&gt; in &lt;module&gt;() ----&gt; 1 ts.resample('D').count() /usr/local/lib/python2.7/dist-packages/pandas/core/generic.pyc in resample(self, rule, how, axis, fill_method, closed, label, convention, kind, loffset, limit, base) 255 def resample(self, rule, how=None, axis=0, fill_method=None, 256 closed=None, label=None, convention='start', --&gt; 257 kind=None, loffset=None, limit=None, base=0): 258 """ 259 Convenience method for frequency conversion and resampling of regular /usr/local/lib/python2.7/dist-packages/pandas/tseries/resample.pyc in resample(self, obj) 98 return obj 99 else: # pragma: no cover --&gt; 100 raise TypeError('Only valid with DatetimeIndex or PeriodIndex') 101 102 rs_axis = rs._get_axis(self.axis) TypeError: Only valid with DatetimeIndex or PeriodIndex </code></pre> <p>That can be fixed by turning the datetime column into an index with set_index. However after I do that, I still get the following error:</p> <pre><code>DataError: No numeric types to aggregate </code></pre> <p>because my Dataframe does not have a numeric column.</p> <p>But I just want to count rows!! The simple "select count(*) group by ... " from SQL.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USfccoelho
    1. USfccoelho
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COActually, it is!
      singulars
      1. POCounting daily events on Pandas Time series
      1. USDan Allan
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload