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findnext

findnext(A, i)

Find the next index >= i of a non-zero element of A, or 0 if not found.

Examples

1. Find the next occurrence of a value in an array:

   julia> arr = [1, 2, 3, 4, 5, 2, 6, 7];
   julia> findnext(arr, 2, 3)
   6

   This example finds the next index greater than or equal to 3 where the value 2 is present in the array arr. It returns 6, which is the index of the next occurrence of 2 after index 3.

2. Search for the next matching element in a sorted array:

   julia> sorted_nums = [1, 3, 5, 7, 9, 11, 13];
   julia> findnext(sorted_nums, 5, 2)
   3

   In this example, findnext is used to search for the next occurrence of 5 in the sorted array sorted_nums, starting from index 2. It returns 3, which is the index of the next occurrence of 5 after index 2.

3. Find the next index of a character in a string:

   julia> text = "Hello, Julia!";
   julia> findnext(text, 'l', 5)
   7

   Here, findnext is applied to find the next index greater than or equal to 5 where the character 'l' is present in the string text. It returns 7, which is the index of the next occurrence of 'l' after index 5.

Common mistake example:

julia> arr = [1, 2, 3, 4, 5];
julia> findnext(arr, 6, 1)
0

In this example, the value 6 is not found in the array arr. As a result, findnext returns 0, indicating that the value was not found. Double-check that the value exists in the collection before using findnext to avoid such errors.

See Also

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