Top "Lookup" questions

How can I add new keys to a dictionary?

Is it possible to add a key to a Python dictionary after it has been created? It doesn't seem to …

python dictionary lookup

How to get the index of an item in a list in a single step?

How can I find the index of an item in a list without looping through it? Currently this doesn't look …

c# linq lookup

How can I lookup a Java enum from its String value?

I would like to lookup an enum from its string value (or possibly any other value). I've tried the following …

java enums lookup

How to do vlookup and fill down (like in Excel) in R?

I have a dataset about 105000 rows and 30 columns. I have a categorical variable that I would like to assign it …

r lookup

Working with dictionaries/lists in R

I have trivial question: I couldn't find a dictionary data structure in R, so I used list instead (like "word"…

r list hashmap lookup

How can I see if a Perl hash already has a certain key?

I have a Perl script that is counting the number of occurrences of various strings in a text file. I …

perl hash key lookup

pandas loc vs. iloc vs. ix vs. at vs. iat?

Recently began branching out from my safe place (R) into Python and and am a bit confused by the cell …

python pandas performance indexing lookup

Lookup a value if the dates fall between two dates

I have window dates in two cells. For example: a1 = 1/1/2014 8:00 b1 = 1/4/2014 10:00 c1 = 11 Where A is the start date B is …

excel date lookup between

What is the point of Lookup<TKey, TElement>?

The MSDN explains Lookup like this: A Lookup<TKey, TElement> resembles a Dictionary<TKey, TValue>. The …

c# .net linq lookup

Sharepoint LookUp field on Choice field?

How to create a lookup field for the Choice field..For eg: In a list i have Choice field and …

sharepoint sharepoint-2010 sharepoint-2007 lookup