CODEWITHSUNDEEP
matplotlib
user13561110
user13561110

Reputation:

What is the significance of i+1 in plt.subplot(3, 3, i + 1)?

What is the significance of i+1 in plt.subplot(3, 3, i + 1) ? in the following code:

for i in range(9):
    plt.subplot(3, 3, i + 1)
    img = plt.imread(os.path.join(img_dir, random_images[i]))
    plt.imshow(img, cmap='gray')
    plt.axis('off')

Upvotes: 1

Views: 420

Answers (2)

Sheldore
Sheldore

Reputation: 39062

i+1 is the counter for the subplot in your 3x3 subplot grid.

Why add 1?

The subplot numbering starts from 1 but the range(9) starts from 0, so i+1 is used here to add 9 subplots, starting from 1, 2, 3, ..., 8, 9

Upvotes: 2

Ori Cohen
Ori Cohen

Reputation: 185

matplotlib starts counting at 1, while the range function starts at 0. range(9) will return 0...8, while matplotlib needs 1...9, the i+1 moves the range(9) results to numbers matplotlib expects

Upvotes: 1

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