map function

Defining a map function is thus really just a matter of determining what you want to grab from an incoming line of text.

These variables have to be set in the master routine in the configuration before the map function is called.

Moving inside-out in Listing 12, notice that we use the map function, which takes two parameters: a function and a sequence.

Now Futon presents an interface that allows you to define both a map function and a reduce function.

Averages, summations, and other summary types of data are not possible with just a map function.

In the canonical model, a map function processes key-value pairs, resulting in an intermediate set of key-value pairs.

Using this with the map function, we get a sequence of integers, just as we wanted.

This data needs to have the map function applied to it.

When working with MapReduce, the map function's job is to pick some value to work off of, along with some key.

The next line illustrates the use of the map function.

Listing 5 shows how you specify the map function for your log analyzer sample.

Count of URL Access Frequency: The map function processes logs of web page requests and outputs .

Inverted Index: The map function parses each document, and emits a sequence of pairs.

As you can see, the map function in Listing 5 is defined in JavaScript.

If you don't put a restriction in your map function (as I did in Listing 5), then the emit will essentially sort the passed-in documents.

The mouse value is read, then mapped (via the map function) into the range -PI to PI.

The Map function emits each word plus an associated count of occurrences.

Now that we have this sequence of sequences, we use the map function.

The first, keys, is a list of keys that were created in the map function.

You can invoke the Test Map function from the toolbar (Figure 5) or the context menu of the map (Figure 6).

To find all the tickets issued by Officer Ree, for example, you write a map function that filters the officer property accordingly.