Use fraction parameter to match graph
Fraction parameter in colorbar() is used to set the size of colorbar in Python. Using this we can match colorbar size to graph as:
- If vertical colorbar is used, then fraction=0.047 * (height_of_image / width_of_image)
- If horizontal colorbar is used, then fraction=0.047 * (width_of_image / height_of_image)
Approach
- Import module
- Plot a graph
- Set fraction parameter
- Plot colorbar
- Display plot
Example 1:
Here we are importing the required libraries and then plotting the graph, we are calculating the ratio then we are setting the fraction parameter and plotting the colorbar and finally displaying it.
Python3
import matplotlib.pyplot as pltimport numpy as np# Plot an imagea = np.random.random((10, 20))plt.imshow(a, cmap='gray')# Calculate (height_of_image / width_of_image)im_ratio = a.shape[0]/a.shape[1]# Plot vertical colorbarplt.colorbar(fraction=0.047*im_ratio)plt.show() |
Output:
Set Matplotlib colorbar size to match graph
Example 2:
Python3
import matplotlib.pyplot as pltimport numpy as np# Plot an imagea = np.random.random((10, 20))plt.imshow(a, cmap='gray')# Calculate (width_of_image/height_of_image)im_ratio = a.shape[1]/a.shape[0]# Plot horizontal colorbarplt.colorbar(orientation="horizontal", fraction=0.047*im_ratio)plt.show() |
Output:
Set Matplotlib colorbar size to match graph
Set Matplotlib colorbar size to match graph
Colorbar size that match graph or image is required to get good visualize effect. This can be achieved using any one of following approaches.
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