python - Slicing a pandas dataframe to the first instance of all columns containing a value -

-

i have simple pandas time series dataframe similar this:

in [69]: df out[69]:                  b date 2015-01-01  nan  nan 2015-02-01  1.1  nan 2015-03-01  nan  nan 2015-04-01  1.2  nan 2015-05-01  1.5  1.2 2015-06-01  1.6  1.9 2015-07-01  1.3  nan 2015-08-01  1.2  3.0 2015-09-01  1.1  1.1

what best way obtain data frame first point there value in columns onwards, i.e. output programmatically?

in [71]: df.ix[4:] out[71]:                  b date 2015-05-01  1.5  1.2 2015-06-01  1.6  1.9 2015-07-01  1.3  nan 2015-08-01  1.2  3.0 2015-09-01  1.1  1.1

you can use .first_valid_index() first non-nan index column. 

# data # ============================ df                   b date                 2015-01-01  nan  nan 2015-02-01  1.1  nan 2015-03-01  nan  nan 2015-04-01  1.2  nan 2015-05-01  1.5  1.2 2015-06-01  1.6  1.9 2015-07-01  1.3  nan 2015-08-01  1.2  3.0 2015-09-01  1.1  1.1  # processing # ================================ # first valid index each column # , calculate max first_valid_loc = df.apply(lambda col: col.first_valid_index()).max()  df.loc[first_valid_loc:]                   b date                 2015-05-01  1.5  1.2 2015-06-01  1.6  1.9 2015-07-01  1.3  nan 2015-08-01  1.2  3.0 2015-09-01  1.1  1.1

Comments

Post a Comment

Popular posts from this blog

python - pip install -U PySide error -

-
does know how avoid following error when running pip install -u pyside per official website instructions here: https://pypi.python.org/pypi/pyside/#installing-pyside-on-a-mac-os-x-system note have done brew install qt successfully. you using pip version 7.0.3, version 7.1.2 available. should consider upgrading via 'pip install --upgrade pip' command. collecting pyside using cached pyside-1.2.4.tar.gz installing collected packages: pyside running setup.py install pyside complete output command /applications/anaconda/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/dy/ttgqhqqx3g9bsbsnqnxsk2z80000gq/t/pip-build-cpxemt/pyside/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/dy/ttgqhqqx3g9bsbsnqnxsk2z80000gq/t/pip-0r7hri-record/install-record.txt --single-version-externally-managed --compile: ...
Read more

arrays - C++ error: a brace-enclosed initializer is not allowed here before ‘{’ token -

-
simple question: i'm trying initialize array within c++ class declaration: using namespace std; #include <string> class myclass{ public: string myarray[] = {"a","b","c"}; }; and i'm getting error: error: brace-enclosed initializer not allowed here before ‘{’ token no, without complied c++11 compiler, cannot initialize member array in declaration. have initialize array member in constructor. , don't use open array if know number of elements initialize array.
Read more

cytoscape.js - How to add nodes to Dagre layout with Cytoscape -

-
i trying add nodes dagre graph through cityscape.js. problem nodes not painted. code have: cy.add({ group: "nodes", data: { id:"n0",name:"n0",weight: 75 }, }); $.ajax(url).done(function(jsontree){ var newnodes=[]; for(var i=1;i<6;i++){ //var child = jsontree.result[i]; newnodes.push( { group: "nodes", data: { id: "n"+i, name:"n"+i}}, { group: "edges", data: { id: "e"+i, source: "n0", target: "n"+i } } ); } cy.add(newnodes); any ideas? have used loaded function reload graph not work. not know if have use specific function reload graph. thank in advance. you need add positions new nodes. cytoscape.js docs : it important note positions of newly added nodes must defined when calling cy.add(). nodes can not placed in graph without valid position — otherwise not displayed. yo...
Read more