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NumPy Cookbook

You're reading from   NumPy Cookbook If you're a Python developer with basic NumPy skills, the 70+ recipes in this brilliant cookbook will boost your skills in no time. Learn to raise productivity levels and code faster and cleaner with the open source mathematical library.

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Product type Paperback
Published in Oct 2012
Publisher Packt
ISBN-13 9781849518925
Length 226 pages
Edition 1st Edition
Languages
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Toc

Table of Contents (17) Chapters Close

NumPy Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Winding Along with IPython 2. Advanced Indexing and Array Concepts FREE CHAPTER 3. Get to Grips with Commonly Used Functions 4. Connecting NumPy with the Rest of the World 5. Audio and Image Processing 6. Special Arrays and Universal Functions 7. Profiling and Debugging 8. Quality Assurance 9. Speed Up Code with Cython 10. Fun with Scikits Index

Loading an example dataset


The scikits-learn project comes with a number of datasets and sample images with which we can experiment. In this recipe, we will load an example dataset, that is included with the scikits-learn distribution. The datasets hold data as a NumPy, two-dimensional array and metadata linked to the data.

How to do it...

We will load a sample data set of the Boston house prices. It is a tiny dataset, so if you are looking for a house in Boston, don't get too excited. There are more datasets as described in http://scikit-learn.org/dev/modules/classes.html#module-sklearn.datasets.

We will look at the shape of the raw data, and its maximum and minimum value. The shape is a tuple , representing the dimensions of the NumPy array. We will do the same for the target array, which contains values that are the learning objectives. The following code accomplishes our goals:

from sklearn import datasets

boston_prices = datasets.load_boston()
print "Data shape", boston_prices.data.shape...
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