python - How to use idxmin() to return USABLE index for pandas Series object -


i trying return index of minimum value of series (which comes column of dask dataframe), , use index access corresponding value in different column of same dataframe. (i.e. value @ same index.) doing intermediate math in process.

i using following code:

start_time = dataframe['time'].sub(c1).pow(2).idxmin()  end_time   = dataframe['time'].sub(c2).pow(2).idxmin()  #now pull out data different column in dataframe using start_time , end_time   data = dataframe['current'].loc[start_time:end_time]

however consistently getting following error:

pandas.core.indexing.indexingerror: many indexers

i have no clue means, 1 other thing noticed have no grasp on type of value idxmin() returning. mysterious object me. when try print out value of start_time or end_time is:

start_time: dd.scalar<series-..., dtype=int32>

end_time: dd.scalar<series-..., dtype=int32>

i cannot find specific information on these objects (although i've determined "scalar" object), , cannot find documentation on methods or attributes exist "scalar" objects.

this crux of problem because appears idxmin() returning data type unusable indexing in dask or pandas....real useful.

i've tried 

data = dataframe.loc[start_time:end_time,'current']

this did not give error, data remains empty after executed.

someone please set me straight.

thanks.

dd.scalar standard lazy value scalar. similar object if compute sum or mean of series.

you might try calling .compute() method see concrete value.


Comments

Post a Comment

Popular posts from this blog

php - Vagrant up error - Uncaught Reflection Exception: Class DOMDocument does not exist -

i've set bento/ubuntu-16.04 vagrant box using php 5.6, , getting following error quite few times when try , run shell script: "uncaught reflection exception: class domdocument not exist". i've tried adding following top of script (not together), each no success: "sudo apt-get install php5.6-xml", "sudo apt-get install php5-xml", "sudo apt-get install php-dom" i've tried resetting server "sudo service apache2 restart". does have suggestions?
Read more

vue.js - Create hooks for automated testing -

Image
qa guys complained can't automate frontend testing. because our html looks same outside. lazy hack did this <template> <div :role="$options.name"> ... </div> </template> <script> export default { name: 'vmcomponentname' } </script> which takes name script , applies html. in browser get: <div role="vmcomponentname"> ... </div> line :role="$options.name" goes in every component. is there dry er solutions? please share. additional details i'll explain in details looking for. imagine have vmusercreate form creates user. test case can create user . to automatically test without role, have use following selector: .wrapper > .wrapper > .wrapper > .submit-button the test extremely brittle (will break lot). if use roles can use [role="vmusercreateform"] .submit-button selector. many folds less brittle. so basically, i'm ...
Read more

Add new key value to json node in java -

i have json file : { "id":1, "name":"abc", "addressdetails": { "city":"newyork" } } i wanted add 1 more key-value ("pincode" : "414141") node 'addressdetails'. i tried using : objectmapper mapper = new objectmapper(); jsonnode root = mapper.readtree(new file("d://test.json")); objectnode node = mapper.createobjectnode(); node.with("addressdetails").put("pincode", "414141"); but it's not getting added, there way can ? you can try you should modify file path objectmapper mapper = new objectmapper(); objectnode nodes = mapper.readvalue(new file("d:\\test.txt"), objectnode.class); nodes.with("addressdetails").put("pincode", "414141"); mapper.writer().writevalue(new file("d:\\test.txt"), nodes);
Read more