Getting first index of a collection in Julia – firstindex() Methods
The firstindex()
is an inbuilt function in julia which is used to return the first index of the specified collection. If a dimension d is given, return the first index of collection along dimension d.
Syntax:
firstindex(collection)
or
firstindex(collection, d)Parameters:
- collection: Specified collection.
- b: Specified dimension.
Returns: It returns the first index of the specified collection. If a dimension d is given, return the first index of collection along dimension d.
Example 1:
# Julia program to illustrate # the use of firstindex() method # Getting the first index of the specified collection. println(firstindex( 0 )) println(firstindex([ 1 , 2 , 3 ])) println(firstindex([ 2 4 ; 5 6 ])) println(firstindex([ 3 ; 5 ; 7 ; 9 ])) |
Output:
Example 2:
# Julia program to illustrate # the use of firstindex() method # Getting the first index of the specified # collection. If a dimension d is given, # return the first index of collection # along dimension d. println(firstindex(rand( 1 , 2 , 3 , 4 ), 1 )) println(firstindex(rand( 1 , 2 , 3 , 4 ), 2 )) println(firstindex([ 1 , 2 , 3 ], 2 )) println(firstindex([ 2 4 ; 6 8 ], 2 )) println(firstindex([ 2 ; 4 ; 6 ; 8 ], 2 )) println(firstindex(cat([ 1 2 ; 3 4 ], [ 5 6 ; 7 8 ], [ 2 2 ; 3 4 ], dims = 3 );)) |
Output:
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