External Interfaces/API

Creating a Copy of a Java Array

You can create an entirely new array from an existing Java array by indexing into the array to describe a block of elements, (or subarray), and assigning this subarray to a variable. The assignment copies the values in the original array to the corresponding cells of the new array.

As with the example in section Creating a New Array Reference, an original array is created and initialized. But, this time, a copy is made of the array contents rather than copying the array reference. Changes made using the reference to the new array do not affect the original.

• origArray = javaArray('java.lang.Double', 3, 4);
  for m = 1:3
     for n = 1:4
        origArray(m,n) = java.lang.Double((m * 10) + n);
     end
  end
  
  origArray
  origArray =
  java.lang.Double[][]:
      [11]    [12]    [13]    [14]
      [21]    [22]    [23]    [24]
      [31]    [32]    [33]    [34]
  
  %  ----- Make a copy of the array contents -----
  newArray = origArray(:,:);
  newArray(3,:) = java.lang.Double(0);
  
  origArray
  origArray = 
  java.lang.Double[][]:
      [11]    [12]    [13]    [14]
      [21]    [22]    [23]    [24]
      [31]    [32]    [33]    [34]
  

Creating a New Array Reference

Passing Data to a Java Method