MATLAB: How to Pad an Array with extra zeros

array reshape

Say I have an array, and I use to reshape function to divide it into equal sections. In the case that it cannot be divided into equal sections, how do I add zeros at the end to compensate? Say A=[1 8 1 9 1 4 1 5 0 4], and I want to divide it into sections of 4. 4 is not a set value.

Best Answer

Here are some simple methods that automatically adjusts to the length of the vector:
Method One: pad to end of vector:
>> A = [1,8,1,9,1,4,1,5,0,4];
>> N = 4;
>> B = A;
>> B(end+1:N*ceil(numel(B)/N)) = 0
B =
   1   8   1   9   1   4   1   5   0   4   0   0
Method Two: preallocate a vector of the right size:
>> A = [1,8,1,9,1,4,1,5,0,4];
>> N = 4;
>> B = zeros(1,N*ceil(numel(A)/N));
>> B(1:numel(A)) = A
B =
   1   8   1   9   1   4   1   5   0   4   0   0
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