python - Pandas Create Link Pairs from Multiple Rows -


i have df id flow id, dttm step modification time, , step steps in flow. ordered dttm. there number of steps particular id.

current df:

    id      dttm                  step 0   81      2015-05-26 07:56:03   1   81      2015-05-26 08:19:07   b 2   81      2015-05-26 08:32:05   c 3   91      2015-05-26 08:07:12   b 4   91      2015-05-26 08:07:12   c

i want create link data feed sankey. therefore want df 3 columns: source, target, , value. value count of ids have such step pair.

desired df:

    source   target   value 0          b        1 1   b        c        2

i know can stuff step 1 row either groupby or possibly cat. however, think create different starting point without advancing solution. part of makes tough steps depend on dttm stay ordered steps appropriately paired. also, fact has dynamic because there number of steps adds difficulty.

how should dynamically "stuff" step column arrive @ link data?

is there way join df of pairs, , remove rows created during join nonsense?

thank , insight!

let's try:

(df.groupby('id')['step'].apply(lambda x: pd.dataframe(list(zip(x, x[1:]))).set_index([0,1]).assign(count=1))    .rename_axis(['id','source','target'])    .sum(level=[1,2]).reset_index())

output:

  source target  count 0           b      1 1      b      c      2

Comments

Post a Comment

Popular posts from this blog

javascript - Create a stacked percentage column -

i have collection of data : var data = [ {"p301a":"10","p301b":"7","p301c":"7","p301d":"3","p301e":"8","p301f":"8","p301g":"8","p301h":"8","p301i":"8","p301j":"8","p301k":"8","p301l":"8","p301m":"8","p301n":"8","p301o":"8","age":"31-40 years","profesion":"2","position":"2"}, {"p301a":"5","p301b":"4","p301c":"4","p301d":"4","p301e":"4","p301f":"4","p301g":"4","p301h":"4","p301i":"4","p301j":"4","p301k":"4...
Read more

Optimising Firebase database by automatically overwriting data -

in firebase app have following structure: posts latest all users can write posts > latest . want limit entries 20 posts save space in database. , posts beyond 20 unnecessary never shown on homepage. how can limit posts 20, when user writes posts > latest posts @ end drop off (be deleted) automatically? this sample should you. you need : const max_log_count = 20; exports.removeold = functions.database.ref('/posts/latest/{postid}').oncreate(event => { const parentref = event.data.ref.parent; return parentref.once('value').then(snapshot => { if (snapshot.numchildren() >= max_log_count) { let childcount = 0; const updates = {}; snapshot.foreach(function(child) { if (++childcount <= snapshot.numchildren() - max_log_count) { updates[child.key] = null; } }); // update parent. removes children. ...
Read more

javascript - Angular UI-Grid customTemplate directive causing rows to load slowly/? -

Image
each grid cell can have more 1 customtemplate loaded. have directive holds watcher on model_col_field listen cell updates on scroll when dom rows updated , recompile celltemplate . without watcher , $compile rows repeat on scroll, showing same set of rows. is there more angular way of approaching or way improve performance? relevant controller code: create gridoptions.data & gridoptions.columndefs : var customtemp = '<div ng-repeat="opt in grid.appscope.colvalueoptionsmodel" ng-init="tempstring=model_col_field.clazz+opt.key;"><comparison-directive dbo="model_col_field" attobj="opt" fff="grid.appscope.getattributetemplate(tempstring)" /></div>'; $scope.gridoptions.columndefs = [ { name:'yindex',pinnedleft:true,celltemplate: customtemp, displayname:'index'}, { name:'col1',celltemplate: customtemp}, { name:'col2',celltemplate: c...
Read more