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tabulate: fix categorical and string edge cases #352

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tabulate: fix categorical and string edge cases #352

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68 changes: 39 additions & 29 deletions inst/tabulate.m
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Original file line number Diff line number Diff line change
Expand Up @@ -84,7 +84,11 @@
endif

total = sum (counts);
percents = 100 * counts ./ total;
if (total == 0)
percents = zeros (size (counts));
else
percents = 100 * counts ./ total;
endif

## Output format: Cell array
out = cell (length (vals), 3);
Expand All @@ -96,40 +100,21 @@
## Handle string arrays
x(ismissing (x)) = [];

## Convert to cellstr and use grp2idx which is robust
[idx, vals] = grp2idx (cellstr (x));

if (isempty (idx))
counts = [];
percents = [];
if (isempty (x))
out = cell (0, 3);
else
counts = accumarray (idx, 1);
total = sum (counts);
percents = 100 * counts ./ total;
endif
## Convert to cellstr and use grp2idx which is robust
[idx, vals] = grp2idx (cellstr (x));

## Output format: Cell array
vals_cell = vals;
out = cell (length (vals_cell), 3);
out(:,1) = vals_cell;
out(:,2) = num2cell (counts);
out(:,3) = num2cell (percents);

if (isempty (idx))
counts = [];
percents = [];
else
counts = accumarray (idx, 1);
total = sum (counts);
percents = 100 * counts ./ total;
endif

## Output format: Cell array
vals_cell = vals;
out = cell (length (vals_cell), 3);
out(:,1) = vals_cell;
out(:,2) = num2cell (counts);
out(:,3) = num2cell (percents);
out = cell (length (vals), 3);
out(:,1) = vals;
out(:,2) = num2cell (counts);
out(:,3) = num2cell (percents);
endif

elseif (islogical (x))
## Handle logical arrays
Expand Down Expand Up @@ -407,3 +392,28 @@
%!error<tabulate: X must be either a numeric vector> tabulate ({1, 2, 3, 4})
%!error<tabulate: X must be either a numeric vector> ...
%! tabulate ({"a", "b"; "a", "c"})

## Test categorical with all undefined values (should return zero counts/percents)
%!test
%! x = categorical ({'a','b','c'});
%! x(:) = categorical (missing);
%! tbl = tabulate (x);
%! assert (iscell (tbl));
%! assert ([tbl{:,2}]', [0; 0; 0]);
%! assert ([tbl{:,3}]', [0; 0; 0]);

## Test categorical with defined categories but no data
%!test
%! x = categorical ({}, {'low','med','high'});
%! tbl = tabulate (x);
%! assert (iscell (tbl));
%! assert ([tbl{:,2}]', [0; 0; 0]);
%! assert ([tbl{:,3}]', [0; 0; 0]);

## Test string array with all missing values (should return empty table)
%!test
%! x = string ({'a','b'});
%! x(:) = missing;
%! tbl = tabulate (x);
%! assert (iscell (tbl));
%! assert (isempty (tbl));