matplotlib.cm.spectral no longer exists

[jnothman]

It was a deprecated alias for nipy_spectral (see matplotlib/matplotlib#7416). It seems to have been removed in the last release of matplotlib (2.2.0), causing some of our examples to fail.

[jnothman]

From the CircleCI logs:

Unexpected failing examples:
/home/circleci/project/examples/cluster/plot_coin_segmentation.py failed leaving traceback:
Traceback (most recent call last):
  File "/home/circleci/project/examples/cluster/plot_coin_segmentation.py", line 75, in <module>
    colors=[plt.cm.spectral(l / float(N_REGIONS))])
AttributeError: module 'matplotlib.cm' has no attribute 'spectral'


/home/circleci/project/examples/cluster/plot_kmeans_silhouette_analysis.py failed leaving traceback:
Traceback (most recent call last):
  File "/home/circleci/project/examples/cluster/plot_kmeans_silhouette_analysis.py", line 98, in <module>
    color = cm.spectral(float(i) / n_clusters)
AttributeError: module 'matplotlib.cm' has no attribute 'spectral'


/home/circleci/project/examples/cluster/plot_digits_agglomeration.py failed leaving traceback:
Traceback (most recent call last):
  File "/home/circleci/project/examples/cluster/plot_digits_agglomeration.py", line 57, in <module>
    interpolation='nearest', cmap=plt.cm.spectral)
AttributeError: module 'matplotlib.cm' has no attribute 'spectral'


/home/circleci/project/examples/decomposition/plot_pca_iris.py failed leaving traceback:
Traceback (most recent call last):
  File "/home/circleci/project/examples/decomposition/plot_pca_iris.py", line 53, in <module>
    ax.scatter(X[:, 0], X[:, 1], X[:, 2], c=y, cmap=plt.cm.spectral,
AttributeError: module 'matplotlib.cm' has no attribute 'spectral'

/home/circleci/project/examples/cluster/plot_digits_linkage.py failed leaving traceback:
Traceback (most recent call last):
  File "/home/circleci/project/examples/cluster/plot_digits_linkage.py", line 90, in <module>
    plot_clustering(X_red, X, clustering.labels_, "%s linkage" % linkage)
  File "/home/circleci/project/examples/cluster/plot_digits_linkage.py", line 66, in plot_clustering
    color=plt.cm.spectral(labels[i] / 10.),
AttributeError: module 'matplotlib.cm' has no attribute 'spectral'


/home/circleci/project/examples/cluster/plot_agglomerative_clustering.py failed leaving traceback:
Traceback (most recent call last):
  File "/home/circleci/project/examples/cluster/plot_agglomerative_clustering.py", line 68, in <module>
    cmap=plt.cm.spectral)
AttributeError: module 'matplotlib.cm' has no attribute 'spectral'


/home/circleci/project/examples/cluster/plot_kmeans_stability_low_dim_dense.py failed leaving traceback:
Traceback (most recent call last):
  File "/home/circleci/project/examples/cluster/plot_kmeans_stability_low_dim_dense.py", line 111, in <module>
    color = cm.spectral(float(k) / n_clusters, 1)
AttributeError: module 'matplotlib.cm' has no attribute 'spectral'


/home/circleci/project/examples/cluster/plot_coin_ward_segmentation.py failed leaving traceback:
Traceback (most recent call last):
  File "/home/circleci/project/examples/cluster/plot_coin_ward_segmentation.py", line 66, in <module>
    colors=[plt.cm.spectral(l / float(n_clusters)), ])
AttributeError: module 'matplotlib.cm' has no attribute 'spectral'

[divya-vakil]

I am also facing issue with the following PCA example:

http://scikit-learn.org/stable/auto_examples/decomposition/plot_pca_iris.html

[jnothman]

Sorry we have been slow to release

[CaiqueCoelho]

You can do this:
cmap = cm.get_cmap("Spectral")
colors = cmap(a / b)