If I recall, strcmpi needs string arrays, character vectors or cell arrays of character vectors as inputs, whereas you give it a table as an input. Therefore, it will only ever return false.
Try combining logic indexing and table2cell, which enables your strcmpi to function:
Result3 = get(uit3, 'data');
s='I3';
Result3(strcmpi(table2cell(Result3(:,2)),s),1)
This will print out the value from the row in Result3 for which your logic is true, and the 1st column. In the example I would expect InputB to come out.
