searchsortedlast
searchsortedlast(a, x, [by=
Returns the index of the last value in a
less than or equal to x
, according to the specified order. Returns 0
if x
is less than all values in a
.
Examples
In the Julia programming language, the function searchsortedlast(a, x, [by=<transform>,] [lt=<comparison>,] [rev=false])
is used to find the index of the last value in a
that is less than or equal to x
, based on the specified order. If x
is less than all values in a
, it returns 0
. Here are some examples of how to use this function:

Find the last value less than or equal to a given number:
julia> arr = [1, 3, 5, 7, 9]; julia> searchsortedlast(arr, 6) 3
In this example, the function returns the index
3
since it is the last index where the value is less than or equal to6
. 
Use a custom comparison function:
julia> arr = ["apple", "banana", "grape", "orange"]; julia> searchsortedlast(arr, "pear", lt = (a, b) > length(a) < length(b)) 2
Here, the function uses a custom comparison function to determine the order based on the length of the strings. It returns the index
2
since it is the last index where the length of the value is less than the length of"pear"
.  Perform a reverse search:
julia> arr = [5, 4, 3, 2, 1]; julia> searchsortedlast(arr, 3, rev = true) 3
In this example, the function performs a reverse search and returns the index
3
since it is the last index where the value is less than or equal to3
in the reversed array.
Common mistake example:
julia> arr = [1, 3, 5, 7, 9];
julia> searchsortedlast(arr, 10)
0
In this example, the value 10
is greater than all the values in the array arr
. Therefore, the function returns 0
as specified in the function's behavior when x
is less than all values in a
.
See Also
find, findfirst, findin, findlast, findmin, findn, findnext, findnz, findprev, rsearch, rsearchindex, searchsorted, searchsortedfirst, searchsortedlast, sort, sort!, sortcols, sortperm, sortperm!,User Contributed Notes
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