take first element from each cell

Dear all, I wanna your help with this problem:

Is there any way to take the first element from each cell depend on b vector:

a=[{[1,9,79,3]  [2,29,16,7,3] 3 [4,74,3] [5,73,79,3] [6,56,3] [7,3]}] ;
b = [79,3,74,10];

the result should be:

result_79: [ 1 5];
result_3: [ 1 2 3 4 5 6 7];
result_74: [ 4];
result_10: [ ];

thanks...

[José-Luis]

What have you tried so far?

Answer 1

[the cyclist]

Here's one way:

a ={[1,9,79,3]  [2,29,16,7,3] 3 [4,74,3] [5,73,79,3] [6,56,3] [7,3]} ;
b = [79,3,74,10];

nb = numel(b);

c = cell(1,nb);

for ia = 1:nb
    c{ia} = find(cellfun(@(x)any(ismember(x,b(ia))),a));
end

[skysky2000]

Thanks alot Cyclist,,, that amazing