How can I delete the elements of array on MATLAB?

The following code is executed but I have no idea to delete the elements of array on MATLAB.

And therefore, Array1 and Array2 are written out with the former data.

Every time when i is increased, I would like to reset Array1 and Array2.

How can I change the following code?

global Array1
global Array2
filename = 'data.xlsx';

for i = 1:3
    sheet = i
    for j = (1:2)-1
        one = [1];
        two = [2];
        Array1 = [Array1; one]
        Array2 = [Array2; two]      
    end
    xlswrite(filename, Array1, sheet, 'A1');
    xlswrite(filename, Array2, sheet, 'B1');
    %here I would like to delete the elements of Array1 and Array2
end 

Answer 1

[Stephan]

To delete an array use:

array1 = [];

[horizon]

Thank you for you answer.

Following your suggestion, is the below code right?

global Array1
global Array2
filename = 'data.xlsx';
for i = 1:3
    sheet = i
    for j = (1:2)-1
        one = [1];
        two = [2];
        Array1 = [Array1; one]
        Array2 = [Array2; two]      
    end
    xlswrite(filename, Array1, sheet, 'A1');
    xlswrite(filename, Array2, sheet, 'B1');
    %here I would like to delete the elements of Array1 and Array2global 
    Array1 = [];
    Array2 = [];
end 

[Stephan]

That should work

Answer 2

[KSSV]

global Array1
global Array2
filename = 'data.xlsx';
for i = 1:3
    sheet = i
    for j = (1:2)-1
        one = [1];
        two = [2];
        Array1 = [Array1; one]
        Array2 = [Array2; two]      
    end
    xlswrite(filename, Array1, sheet, 'A1');
    xlswrite(filename, Array2, sheet, 'B1');
    clearvars Array1 Array2
end 

[horizon]

Thank you for your answer.

When I executed your code, I've got the following error.

>> sample

sheet =

     1


Array1 =

     1
     1
     1


Array2 =

     2
     2
     2


Array1 =

     1
     1
     1
     1


Array2 =

     2
     2
     2
     2

sheet =

     2

Undefined function or variable 'Array1'.

Error in untitled (line 10)
        Array1 = [Array1; one]

[KSSV]

Yes...that's true....you will get that error...try Stephan's solution..