User`s manual

5 Calling Java from MATLAB

5-44

% Concatenate the two along the second dimension.

d3 = cat(2,d1,d2)

d3 =

java.lang.Double[][]:

[2] [4] [6] [ 8] [10]

[3] [5] [7] [ 9] [11]

[4] [6] [8] [10] [12]

Creating a New Array Reference

Because Java arrays in MATLAB are references, assigning an array variable to

another variable results in a second reference to the array.

Consider the following example where two separate array variables reference

a common array. The original array,

origArray, is created and initialized. The

statement

newArrayRef = origArray creates a copy of this array variable.

Changes made to the array referred to by

newArrayRef also show up in the

original array.

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

origArray

origArray =

java.lang.Double[][]:

[11] [12] [13] [14]

[21] [22] [23] [24]

[31] [32] [33] [34]

% ----- Make a copy of the array reference -----

newArrayRef = origArray;

newArrayRef(3,:) = java.lang.Double(0);

origArray

origArray =