How to index a cell vector of strings?

I have a vector of cells, each one is 'x' or 'y'. How can I index them, similar to the "find" function? Thank you.

[Azzi Abdelmalek]

This is not clear, you can illustrate with an example

[Cary]

I imported a matrix from a csv file. The data is all numerical except for one column, which is x,y,x,y,x,y...etc. I need to index this column in the matrix, just like you would with "find" for a numerical vector.

[Cary]

To be more clear...I need to group the 'x's together and the 'y's together, and have their associated rows indexed.

[Azzi Abdelmalek]

suppose s={'x','a','x','y','b','b','c','y','y','x'}, what is the expected result?

Answer 1

[Azzi Abdelmalek]

s={'a','b','x','c','d','x'}
idx=find(ismember(s,'x'))

[Azzi Abdelmalek]

Maybe you need this

s={'x','a','x','y','b','b','c','y','y','x'}
idx=ismember(s,'x')
idy=ismember(s,'y')
outx=[s(idx)' num2cell(find(idx))']
outy=[s(idy)' num2cell(find(idy))']

[Cary]

Thank you very much!