Attaching a big.matrix object

Now that the big.matrix object is on the disk, we can use the information stored in the descriptor file to instantly make it available during an R session. This means that you don't have to reimport the data set, which takes more time for larger files. You can simply point the bigmemory package at the existing structures on the disk and begin accessing data without the wait.

This exercise is part of the course

Scalable Data Processing in R

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Exercise instructions

The big.matrix object x is available in your workspace.

Create a new variable mort that points to x by attaching the "mortgage-sample.desc" file using the attach.big.matrix() function.
Verify that the dimensions of mort are the same as the last exercise.
Call head() on mort.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Attach mortgage-sample.desc
mort <- ___(___)

# Find the dimensions of mort
___

# Look at the first 6 rows of mort
___

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