How can I determine if specific cells within an array are empty?

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I am writing a program to collect certain numbers within an array, but I want to pass over the cells that are empty.

I keep getting the error "Cell contents reference from a non-cell array object. Error in 'if isempty(edgeXPlus{i})'"

I've looked at other people's code and this line seems to work for them, but I can't figure out why it doesn't work in my code.

   for i = 1:(number)
        if (isempty(edgeXPlus))                       %%ensures that the array has values
        else
            if isempty(edgeXPlus{i})                  %%ensures that the cell has a value
            else
                if(edgeXPlus(i) >= xUpper)            %%checks to see if these values are within the correct range
                    count = count + 1;
                    edgeX(count) = edgeXPlus(i)       %%if one is, it is assigned to 'edgeX'
                end
            end
        end
    end