I want a function f such that (outer(X, Y, f))[i, j] is a side-by-side concatenation of the i-th element of X and the j-th element of Y, something like c(X[i], Y[j]), or having a similar structure.
The standard R expression outer(X, Y, f) evaluates to a matrix whose (i, j)-th entry has the value f(X[i], Y[j]).
After much wrestling with the idea of ranking records, I finally settled on numeric based scores for my documents, which I emit to have them sorted based on these scores.
In my application the reducer saves all the part files in HDFS but I want only the reducer wi开发者_开发技巧ll write the part files whose sizes are not 0bytes.Please let me know how to define it.It is
For some reason I\'m only getting a null key from map/reduce result in couchdb on mac Result: {\"rows\":[
Lets say you have two document types, customers and orders. A customer document contains basic information like name, address etc. and orders contain all the order information each time a customer ord
I have a list of 2-tuples like this: l = [(\'a\', 1), (\'b\', 2)] and I want to be able to map this onto a dictionary object, so that I can do something like
I created a small test database in CouchDB and I\'m creating a temporary view in Futon. I wrote the mapper and the reducer. The mapper works, but the check box for the reducer never shows up. I know t
Can anybody explain an example in Paul Graham\'s ANSI Common Lisp page 110? The example try to explain the use &rest and lambda to create functional programming facilities. One of them is a functi
I am new to Hadoop map reduce, I wanted to know that there is some outputformat type which can allow me to emit a matrix (2d array) directly from the m开发者_如何学运维apper (without converting to 1d)
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