MATLAB: Error with indexing ‘First argument must be numeric or logical’

Question

M & z are both 10×1300 cell arrays of same size

Columns 1296 through 1300
    [1×23 double]    [1×23 double]    [1×29 double]    [1×23 double]    [1×25 double]
    [1×27 double]    [1×25 double]    [1×25 double]    [1×25 double]    [1×27 double]
    [1×21 double]    [1×25 double]    [1×27 double]    [1×27 double]    [1×25 double]
    [1×27 double]    [1×29 double]    [1×29 double]    [1×25 double]    [1×23 double]
    [1×27 double]    [1×25 double]    [1×23 double]    [1×27 double]    [1×27 double]
    [1×27 double]    [1×27 double]    [1×23 double]    [1×21 double]    [1×23 double]
    [1×25 double]    [1×29 double]    [1×27 double]    [1×27 double]    [1×27 double]
    [1×27 double]    [1×21 double]    [1×21 double]    [1×29 double]    [1×27 double]
    [1×25 double]    [1×25 double]    [1×25 double]    [1×21 double]    [1×27 double]
    [1×23 double]    [1×25 double]    [1×25 double]    [1×25 double]    [1×23 double]   
index=cellfun( @(Z) find(abs(Z-1)<0.005), z, 'uniform', 0);

index results Columns 1297 through 1300

    [1×0 double]    [1×0 double]    [1×0 double]    [1×0 double]
    [1×0 double]    [1×0 double]    [1×0 double]    [1×0 double]
    [        25]    [1×2 double]    [1×2 double]    [1×2 double]
    [1×2 double]    [1×2 double]    [1×2 double]    [1×2 double]
    [1×2 double]    [1×2 double]    [1×2 double]    [1×2 double]
    [1×0 double]    [1×0 double]    [1×2 double]    [1×2 double]
    [1×0 double]    [1×0 double]    [1×0 double]    [1×0 double]
    [1×0 double]    [1×0 double]    [1×0 double]    [1×0 double]
    [1×0 double]    [1×0 double]    [1×0 double]    [1×0 double]
    [1×0 double]    [1×0 double]    [1×0 double]    [1×0 double]
   Result=cellfun(@(IDX) min(M(IDX)), index, 'uniform', 0); < error occurs on this line finding minimum of M at z=1, how do i fix this?

Is it because of the zeros in index?

Answer 1

Result = zeros(size(index));
t = ~cellfun(@isempty,index);
Result(t) = cellfun(@(mm,ii)min(mm(ii)),M(t),index(t));