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[doc] Update sparse.md #6580

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Nov 11, 2022
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[doc] Update sparse.md #6580

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2 changes: 1 addition & 1 deletion docs/lang/articles/basic/sparse.md
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Original file line number Diff line number Diff line change
Expand Up @@ -276,7 +276,7 @@ You can use `ti.rescale_index(descendant_snode/field, ancestor_snode, index)` to
print(ti.rescale_index(x, block1, ti.Vector([7, 3]))) # output: [1, 0]
print(ti.rescale_index(x, block2, [7, 3])) # output: [3, 1]
print(ti.rescale_index(x, pixel, [7, 3])) # output: [7, 3]
print(ti.rescale_index(block1, block2, [3, 1])) # output: [1, 0]
print(ti.rescale_index(block2, block1, [3, 1])) # output: [1, 0]
```

Regarding line 1, you can also compute the `block1` index given `pixel` index `[7, 3]` as `[7//2//2, 3//2//2]`. However, doing so couples computation code with the internal configuration of data structures (in this case, the size of `block1` containers). By using `ti.rescale_index()`, you can avoid hard-coding internal information of data structures.
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