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ADDING ZEROS to the front of array

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ANDREW LIU
ANDREW LIU 2015-7-10
回答： Mohammad Sohail Khan 2017-10-3
May I ask for help
I have two arrays like A=[ 111000 ] & B=[ 1111000 ]
I would like to make A become [0111000],or for example if B=[101111000],A becomes[000111000].
Thank you
  1 个评论
Ashmil Mohammed
Ashmil Mohammed 2015-7-10
So you need to add zeros to the beginning of A for every extra element in B?

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采纳的回答

Guillaume
Guillaume 2015-7-10
newA = [zeros(1, max(0, numel(B)-numel(A))), A]

更多回答（2 个）

Image Analyst
Image Analyst 2015-7-10
Simply pad the left with zeros if necessary to make them the same length, then AND the vectors. Here it is bot both cases you gave:
% Case #1
A=[1,1,1,0,0,0]
B=[1,1,1,1,0,0,0]
% Make them the same size.
% If A is shorter, prepend zeros
la = length(A)
lb = length(B)
if la < lb
A = [zeros(1, lb-la), A]
end
% Do the operation for case #1:
A = A & B
% Now let's do Case #2
A=[1,1,1,0,0,0]
B=[1,0,1,1,1,1,0,0,0]
% Make them the same size.
% If A is shorter, prepend zeros
la = length(A)
lb = length(B)
if la < lb
A = [zeros(1, lb-la), A]
end
% Do the operation for case #2:
A = A & B
Mohammad Sohail Khan
Thank You

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