Remove columns of cell that contain double

I am aware that I can use http://www.mathworks.com/help/matlab/ref/isa.html to determine the data type of an object. However, how would I find the data type of the columns of a cell ? I need to remove the cells that are of not type double. For example, I have tried

isa(result{:},'double')
isa(result,'double')

to find out if the columns are of type double and it has not worked. I decided to just use a for loop to find the columns that contain double/single. Given this new data keep where keep(i) = 1 if column i contains single and 0 if column i contains double, how do i remove the columns that contain doubles ?

Answer 1

[the cyclist]

Use the cellfun function to apply a function to each cell of a cell array. For example,

C = {[1 2 3],'a'};
removeIdx = not(cellfun(@(x)isa(x,'double'),C));
C(removeIdx) = [];

Answer 2

[KSSV]

C = {1:10, [2; 4; 6], ['cool']};    % A cell array 

types = cellfun(@class, C,'UniformOutput', false) ;   % get the classes of each cell 

IndexC = strfind(types, 'double');    % get the indices of doubles
Index = find(not(cellfun('isempty', IndexC)));
iwant = C(Index)    % pick only doubles