在 Julia 中创建具有重复元素的数组 – repeat() 方法

repeat()是 julia 中的内置函数，用于通过以指定次数重复指定数组元素来构造数组。

Syntax:
repeat(A::AbstractArray, counts::Integer…)
or
repeat(A::AbstractArray; inner, outer)
or
repeat(s::AbstractString, r::Integer)
or
repeat(c::AbstractChar, r::Integer)

Parameters:

• A::AbstractArray: Specified array.
• counts::Integer: Specified number of times each element get repeated.
• inner: It says the repetition of individual element.
• outer: It says the repetition of whole slice.
• s::AbstractString: Specified string.
• r::Integer: Specified number of times each element get repeated.
• c::AbstractChar: Specified character.

Returns: It returns a new constructed array.

示例 1：

# Julia program to illustrate 
# the use of Array repeat() method
  
# Constructing an array by repeating
# the specified 1D array with the 
# specified number of times.
A = [1, 2, 3, 4];
println(repeat(A, 1))
  
# Constructing an array by repeating
# the specified 1D array with the 
# specified number of times.
B = [1, 2, 3, 4];
println(repeat(B, 1, 2))
  
# Constructing an array by repeating
# the specified 2D array with the 
# specified number of times.
C = [1 2; 3 4];
println(repeat(C, 2))
  
# Constructing an array by repeating
# the specified 2D array with the 
# specified number of times.
D = [1 2; 3 4];
println(repeat(D, 2, 2))

输出：

示例 2：

# Julia program to illustrate 
# the use of Array repeat() method
  
# Constructing an array by repeating
# the specified elements with the 
# specified inner value
println(repeat(1:3, inner = 2))
  
# Constructing an array by repeating
# the specified elements with the 
# specified outer value
println(repeat(2:4, outer = 2))
  
# Constructing an array by repeating
# the specified elements with the 
# specified inner and outer value
println(repeat([5 10; 15 20], inner =(2, 1), outer =(1, 3)))

输出：

示例 3：

# Julia program to illustrate 
# the use of Array repeat() method
  
# Getting new string after repetition of
# specified string or character
println(repeat("GFG", 3))
println(repeat("GeeksforGeeks", 2))
println(repeat("a", 4))
println(repeat("A", 5))

输出：

GFGGFGGFG
GeeksforGeeksGeeksforGeeks
aaaa
AAAAA