Putting NULLs in between the string array.

I have string array A={'a','b','c','d','e'}, and index vector index=[1,3,5]. I want to put NULL values at this location and shift other values. For example my output should be like this: Output={[],'a','b',[],'c','d',[],'e'}. How can I do that.

Answer 1

[Simon Chan]

Hope I understand it correctly, try this:

A={'a','b','c','d','e'};
index=[1,3,5];
newindex = index+(0:length(index)-1);
N = length(A)+length(index);
Output = repelem({''},1,N);
Output(~ismember(1:N,newindex))=A

Output = 1×8 cell array
    {0×0 char}    {'a'}    {'b'}    {0×0 char}    {'c'}    {'d'}    {0×0 char}    {'e'}

[MakM]

Thanks mate, It worked :)

[MakM]

It is not working correct if I hv to put NULL on two consective values, for example in the above example if the index is [1,2,3,5], then not working correct.

[Simon Chan]

May I know the definition of the index?

For the previous answer, I assume the empty cell happens before the 1st, 3rd and 5th letters.

Did your definition refers to the location of the empty positions like the following?

A={'a','b','c','d','e'};
index=[1,2,3,5];
N = length(A)+length(index);
Output = repelem({''},1,N);
Output(~ismember(1:N,index))=A

Output = 1×9 cell array
    {0×0 char}    {0×0 char}    {0×0 char}    {'a'}    {0×0 char}    {'b'}    {'c'}    {'d'}    {'e'}

[MakM]

Thanks for the answer. Yes this is what I exactly want :)

Answer 2

[Mathieu NOE]

hello

here you are

A={'a','b','c','d','e'};
index=[1,3,5];

%% main code
ll = numel(A)+numel(index);
index_comp = (1:ll);
index2 = index + (0:numel(index)-1);
index_comp(index2) = [];

Output = cell(1,ll);
Output(index_comp) = A

[MakM]

Hey..

It is not working correct in the case if I want to put NULL on two consective values, for example if the index is [1,2,3,5], then not working correct.