Create interpolation_methods.py
Rename examples/api/interpolation_methods.py to examples/images_contours_and_fields/interpolation_methods.py
Update interpolation_methods.py
Fix dpi detection in tight_bbox (fixes #2586).
backend_pgf: use the bounding box as clip rectangle (fixes #2586)
Update interpolation_methods.py

Update according Phils suggestion.
Update interpolation_methods.py
Make standardization of input optional in mlab.PCA

In principal component analysis, standardization of input data should be a user choice, depending on the problem at hand. The current version always standardizes, without offering a choice to the user. Therefore, I added an option to the PCA class where the user can specify whether the input data are to be standardized before performing the PCA. When *standardize* is set to False, only centering is performed, without dividing by sigma. The default is to standardize, to remain compatible with the current version.
Merge pull request #2752 from aszilagyi/patch-1

Make standardization of input optional in mlab.PCA
Merge pull request #2621 from pwuertz/fix_2586

Simplify and fix dpi handling in tight_bbox
Merge pull request #2599 from RutgerK/master

Create interpolation_methods.py