How to add zeros in front of an array

Question

Gn Gnk 2019-12-27

回答： Walter Roberson 2019-12-27

Hello ,

i want to add zeros in front of an array but i want to do that for 3 times and each time the zeros are increasing by1 .

eg 1st time : 0 array

2nd time : 00 array

3rd time : 000 array

I want to use a for-loop but i am getting errors like that :

for l=1:3
    output(l,:)=[zeros(1,l) , example_array];
end

Any ideas?

Answer 1

Walter Roberson 2019-12-27

output = cell(3,1);
for l=1:3
    output{l}=[zeros(1,l) , example_array];
end

The reason what you tried failed is that the rows are all different lengths.

If you wanted to do

array 0 0
0 array 0
0 0 array
  

then you could do something close to what you had:

  L = length(example_array);
  output = zeros(3, L+3);
  for l = 1 : 3
      output(l, l+1:l+L) = example_array;
  end