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Fix #341: Add support for string and categorical arrays in confusionmat #350

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Fix #341: Add support for string and categorical arrays in confusionmat #350

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23 changes: 19 additions & 4 deletions inst/confusionmat.m
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Original file line number Diff line number Diff line change
Expand Up @@ -191,11 +191,26 @@
C(row_index, col_index)++;
endfor

elseif (isstring (y_true))
## string array
## FIXME: not implemented yet
// MY FIX STARTS
elseif (isstring (y_true) || iscategorical (y_true))
## string or categorical array

error ("confusionmat: string array not implemented yet");
if (! exist ("unique_tokens", "var"))
unique_tokens = union (y_true, y_pred);
endif

C_size = length (unique_tokens);
C = zeros (C_size);

for i = 1:length (y_true)
row_index = find (unique_tokens == y_true(i));
col_index = find (unique_tokens == y_pred(i));

if (! isempty (row_index) && ! isempty (col_index))
C(row_index, col_index)++;
endif
endfor
// FIX COMPLETED
else
error ("confusionmat: invalid data type");
endif
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