Custom colormaps in Matplotlib - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the module needed to create custom colormaps in matplotlib.

Matplotlib

from matplotlib import [1]

Drag options to blanks, or click blank then click option'

Apyplot

Bcolors

Ccm

Dimage

Attempts:

3 left

💡 Hint

Common Mistakes

Importing 'pyplot' instead of 'colors'.

Using 'cm' which is for colormap instances, not creation.

The 'colors' module in matplotlib is used to create and manipulate colormaps.

2fill in blank

medium

Complete the code to create a linear segmented colormap from a list of colors.

Matplotlib

custom_cmap = colors.LinearSegmentedColormap.from_list('my_cmap', [1])

Drag options to blanks, or click blank then click option'

A['red', 'green', 'blue']

B'red, green, blue'

C('red', 'green', 'blue')

D{'red', 'green', 'blue'}

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a string of colors instead of a list.

Using a set or tuple instead of a list.

The from_list method expects a list of colors to create the colormap.

3fill in blank

hard

Fix the error in the code to correctly create a colormap with three colors.

Matplotlib

cmap = colors.LinearSegmentedColormap.from_list('cmap', ['red', [1], 'blue'])

Drag options to blanks, or click blank then click option'

A'green'

B'yellow'

Cgreen

Dyellow

Attempts:

3 left

💡 Hint

Common Mistakes

Using color names without quotes causing syntax errors.

Using invalid color names.

Colors must be strings, so 'green' with quotes is correct.

4fill in blank

hard

Fill both blanks to create a colormap with three colors and use it in a scatter plot.

Matplotlib

cmap = colors.LinearSegmentedColormap.from_list('cmap', ['red', [1], 'blue'])
plt.scatter(x, y, c=z, cmap=[2])

Drag options to blanks, or click blank then click option'

A'yellow'

Bcmap

C'green'

Dcustom_cmap

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the colormap name as a string instead of the variable.

Using wrong color names or missing quotes.

The colormap uses 'green' as the middle color and the variable 'cmap' is passed to scatter.

5fill in blank

hard

Fill all three blanks to create a reversed colormap and apply it to an image plot.

Matplotlib

base_cmap = colors.LinearSegmentedColormap.from_list('base', ['blue', [1], 'red'])
reversed_cmap = base_cmap.[2]()
plt.imshow(data, cmap=[3])

Drag options to blanks, or click blank then click option'

A'white'

Breversed

Creversed_cmap

D'reversed'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'reverse' instead of 'reversed()' method.

Passing the colormap name as a string instead of the variable.

The middle color is 'white', the method to reverse a colormap is 'reversed()', and the reversed colormap variable is passed to imshow.