public void ProcessData(IMatrixData mdata, Parameters param, ref IMatrixData[] supplTables,
			ref IDocumentData[] documents, ProcessInfo processInfo)
        {
            string colName = param.GetStringParam("Name of new column").Value;
            int[] columns = param.GetMultiChoiceParam("Categories").Value;
            bool inverse = param.GetBoolParam("Inverse").Value;
            int[] catCols;
            int[] stringCols;
            Split(columns, out catCols, out stringCols, mdata.CategoryColumnCount);
            string[] word1 = param.GetMultiStringParam("Search terms").Value;
            if (word1.Length == 0){
                processInfo.ErrString = "Please specify one or more search terms.";
                return;
            }
            if (string.IsNullOrEmpty(colName)){
                colName = word1[0];
            }
            string[] word = new string[word1.Length];
            for (int i = 0; i < word.Length; i++){
                word[i] = word1[i].ToLower().Trim();
            }
            bool[] indicator = new bool[mdata.RowCount];
            foreach (int col in catCols){
                string[][] cat = mdata.GetCategoryColumnAt(col);
                for (int i = 0; i < cat.Length; i++){
                    foreach (string s in cat[i]){
                        foreach (string s1 in word){
                            if (s.ToLower().Contains(s1)){
                                indicator[i] = true;
                                break;
                            }
                        }
                    }
                }
            }
            foreach (string[] txt in stringCols.Select(col => mdata.StringColumns[col])){
                for (int i = 0; i < txt.Length; i++){
                    string s = txt[i];
                    foreach (string s1 in word){
                        if (s.ToLower().Contains(s1)){
                            indicator[i] = true;
                            break;
                        }
                    }
                }
            }
            string[][] newCol = new string[indicator.Length][];
            for (int i = 0; i < newCol.Length; i++){
                bool yes = inverse ? !indicator[i] : indicator[i];
                newCol[i] = yes ? new[]{"+"} : new string[0];
            }
            mdata.AddCategoryColumn(colName, "", newCol);
        }