Instead of
handles.finishCell = finishCell{k};
you need
handles.finishCell = finishCell(k);
A cell array is a collection of containers. You could think of them as being like boxes: you can put things into (or get out of) of the boxes, or you can handle the boxes themselves. Each of these is useful in different situations. Just like there is a difference between "I'll go get my teddybear out of its box in the attic", and "I'll get that box with my teddybear in it down from the attic": in you case you end up with your teddybear in your hand, and in the other you have a box in your hand.
MATLAB gives you the same control:
- () parentheses simply returns a part of the array that you are indexing into: numeric if a numeric array, char if a char array, cell if a cell array, table if table, etc. Therefore this gives you the box itself!
- {} curly braces accesses the contents of a cell array or table. This gets things in/out of the box!
Your mistake was to get whatever it was out of the cells... and that is the numeric data that you had earlier allocated into that cell array (and is clearly not a cell array).
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