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Julia eachindex()用法及代碼示例

這個eachindex()是 julia 中的一個內置函數,用於創建一個可迭代對象以訪問指定數組的每個索引。

用法:
eachindex(A…)

參數:

  • A:指定數組。

返回值:它返回一個可迭代對象,用於訪問指定數組的每個索引。

範例1:


# Julia program to illustrate 
# the use of Array eachindex() method
  
# Accessing each index of 1D array 
A = [1, 2, 3, 4];
  
# linear indexing
for i in eachindex(A)
    println(i)
end
  
# Accessing each index of 2D array 
B = [2 4; 6 8];
  
# linear indexing
for i in eachindex(B)
    println(i)
end
  
# Accessing each index of 3D array 
C = cat([1 2; 3 4], [5 6; 7 8], [2 2; 3 4], dims = 3);
  
# linear indexing
for i in eachindex(C)
    println(i)
end

輸出:


範例2:


# Julia program to illustrate 
# the use of Array eachindex() method
  
# Accessing each index of 1D array 
A = [1, 2, 3, 4];
  
# Cartesian indexing
for i in eachindex(view(A, 1:2, 1:1)) 
    println(i)
end
  
# Accessing each index of 2D array 
B = [2 4; 6 8];
  
# Cartesian indexing
for i in eachindex(view(B,:, 1)) 
    println(i)
end
  
# Accessing each index of 3D array 
C = cat([1 2; 3 4], [5 6; 7 8], [2 2; 3 4], dims = 3);
  
# Cartesian indexing
for i in eachindex(view(C,:,:, 1)) 
    println(i)
end

輸出:




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注:本文由純淨天空篩選整理自Kanchan_Ray大神的英文原創作品 Iterating over each index of array in Julia – eachindex() Method。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。