diff --git a/lib/io/dsv_io.cpp b/lib/io/dsv_io.cpp
index af3ccee..e335c88 100644
--- a/lib/io/dsv_io.cpp
+++ b/lib/io/dsv_io.cpp
@@ -29,7 +29,6 @@
 
 gctl::dsv_io::dsv_io()
 {
-    file_ = "";
     att_sym_ = '#';
 	tag_sym_ = '!';
 	deli_sym_ = ' ';
@@ -45,7 +44,6 @@ gctl::dsv_io::~dsv_io()
 
 gctl::dsv_io::dsv_io(std::string filename, std::string file_exten, int t)
 {
-    file_ = "";
     att_sym_ = '#';
 	tag_sym_ = '!';
 	deli_sym_ = ' ';
@@ -59,7 +57,6 @@ gctl::dsv_io::dsv_io(std::string filename, std::string file_exten, int t)
 
 void gctl::dsv_io::clear()
 {
-    file_ = "";
     att_sym_ = '#';
 	tag_sym_ = '!';
 	deli_sym_ = ' ';
@@ -210,8 +207,6 @@ void gctl::dsv_io::load_text(std::string filename, std::string file_exten, int t
     std::ifstream infile;
     open_infile(infile, filename, file_exten);
 
-    file_ = filename + file_exten;
-
     int h = 0;
     std::string tmp_line;
     std::vector<std::string> lines;
@@ -398,10 +393,9 @@ void gctl::dsv_io::init_table(int row, int col)
 
 void gctl::dsv_io::info(int t)
 {
-    std::clog << "File: " << file_ << "\n------------\n";
-    std::clog << "Head(s): " << head_num_ << "\n";
     if (t & HeadInfo)
     {
+        std::clog << "Head(s): " << head_num_ << "\n";
         for (size_t i = 0; i < heads_.size(); i++)
         {
             std::clog << heads_[i] << "\n";
@@ -409,9 +403,9 @@ void gctl::dsv_io::info(int t)
         std::clog << "------------\n";
     }
 
-    std::clog << "Annotation(s): " << annotates_.size() << "\n";
     if (t & AttInfo)
     {
+        std::clog << "Annotation(s): " << annotates_.size() << "\n";
         for (size_t i = 0; i < annotates_.size(); i++)
         {
             std::clog << annotates_[i] << "\n";
@@ -419,16 +413,15 @@ void gctl::dsv_io::info(int t)
         std::clog << "------------\n";
     }
 
-    std::clog << "Tag(s): " << tags_.size() << "\n";
     if (t & TagInfo)
     {
+        std::clog << "Tag(s): " << tags_.size() << "\n";
         for (size_t i = 0; i < tags_.size(); i++)
         {
             std::clog << tags_[i] << "\n";
         }
         std::clog << "------------\n";
     }
-    else std::clog << "------------\n";
 
     if (t & ColInfo)
     {
@@ -969,7 +962,6 @@ gctl::geodsv_io::~geodsv_io(){}
 
 gctl::geodsv_io::geodsv_io(std::string filename, std::string file_exten, int t)
 {
-    file_ = "";
     att_sym_ = '#';
 	tag_sym_ = '!';
 	deli_sym_ = ' ';
diff --git a/lib/io/dsv_io.h b/lib/io/dsv_io.h
index 52cdd68..c5fe61b 100644
--- a/lib/io/dsv_io.h
+++ b/lib/io/dsv_io.h
@@ -140,8 +140,6 @@ namespace gctl
     class dsv_io
 	{
 	protected:
-		// 文件名
-		std::string file_;
         // 头信息行数 表格行数（不包括表头） 表格列数（不包括表头）
 		int head_num_, row_num_, col_num_;
 		// 注释行起始符 标记行起始符 分割符
diff --git a/tool/dsviewer/dsviewer.cpp b/tool/dsviewer/dsviewer.cpp
index 8fa73dc..f961c3c 100644
--- a/tool/dsviewer/dsviewer.cpp
+++ b/tool/dsviewer/dsviewer.cpp
@@ -221,7 +221,7 @@ void info(const std::vector<std::string> &cmd_units)
     std::regex pata("att"), patt("tag"), patc("col"), patr("row"), path("hdr");
 
     // info [att|tag|hdr|col|row]
-    int info_code;
+    int info_code = 0;
     if (cmd_units.size() > 1)
     {
         if (regex_search(cmd_units[1], ret, pata)) info_code = AttInfo;
@@ -389,6 +389,94 @@ void statistic(const std::vector<std::string> &cmd_units)
     return;
 }
 
+void set_titles(const std::vector<std::string> &cmd_units)
+{
+    // title <row|col> <t1>,<t2>,<t3>,... [<id1>,<id2>,<id3>,...]
+    if (cmd_units.size() < 3) throw std::runtime_error("title: insufficient parameters.");
+    if (cmd_units[1] == "row")
+    {
+        std::vector<std::string> row_titles;
+        std::vector<int> row_ids;
+        parse_string_to_vector(cmd_units[2], ',', row_titles);
+        if (cmd_units.size() >= 4)
+        {
+            parse_string_to_vector(cmd_units[3], ',', row_ids);
+            if (row_titles.size() != row_ids.size()) throw std::runtime_error("title: invalid parameters.");
+            tc.row_names(row_titles, row_ids);
+        }
+        else tc.row_names(row_titles);
+    }
+    else if (cmd_units[1] == "col")
+    {
+        std::vector<std::string> col_titles;
+        std::vector<int> col_ids;
+        parse_string_to_vector(cmd_units[2], ',', col_titles);
+        if (cmd_units.size() >= 4)
+        {
+            parse_string_to_vector(cmd_units[3], ',', col_ids);
+            if (col_titles.size()!= col_ids.size()) throw std::runtime_error("title: invalid parameters.");
+            tc.column_names(col_titles, col_ids);
+        }
+        else tc.column_names(col_titles);
+    }
+    else throw std::runtime_error("title: invalid parameters.");
+    return;
+}
+
+void math_func(const std::vector<std::string> &cmd_units)
+{
+    // math <func> <col1>,<col2>,<col3>...
+    if (cmd_units.size() < 3) throw std::runtime_error("math: insufficient parameters.");
+
+    std::vector<std::string> col_names;
+    parse_string_to_vector(cmd_units[2], ',', col_names);
+
+    tc.cal_column(cmd_units[1], col_names, 12);
+    return;
+}
+
+void rand_data(const std::vector<std::string> &cmd_units)
+{
+    // random normal|uniform <p1> <p2> [<colname>]
+    if (cmd_units.size() < 4) throw std::runtime_error("random: insufficient parameters.");
+
+    random_type_e rd_type = RdNormal;
+    if (cmd_units[1] == "normal") rd_type = RdNormal;
+    else if (cmd_units[1] == "uniform") rd_type = RdUniform;
+    else throw std::runtime_error("random: invalid parameters.");
+
+    double p1 = atof(cmd_units[2].c_str());
+    double p2 = atof(cmd_units[3].c_str());
+    array<double> rd_data(tc.row_number());
+    rd_data.random_float(p1, p2, rd_type);
+
+    std::string col_name = "RdData";
+    if (cmd_units.size() >= 5) col_name = cmd_units[4];
+
+    tc.add_column(col_name);
+    tc.fill_column(rd_data, col_name, 12);
+    return;
+}
+
+void filt_data(const std::vector<std::string> &cmd_units)
+{
+    // filter <out-table> <expression> <cdn1>,<cdn2>,<cdn3>... <out1>,<out2>,<out3>...
+    if (cmd_units.size() < 5) throw std::runtime_error("filter: insufficient parameters.");
+    std::vector<std::string> tar_names, out_names;
+    parse_string_to_vector(cmd_units[3], ',', tar_names);
+    parse_string_to_vector(cmd_units[4], ',', out_names);
+
+    dsv_io out_table;
+    if (tar_names.size() == 1) tc.filt_column(cmd_units[2], tar_names[0], out_names, out_table);
+    else tc.filt_column(cmd_units[2], tar_names, out_names, out_table);
+
+    std::string naked_name, exten_name;
+    parse_filename(cmd_units[1], naked_name, exten_name);
+    if (exten_name == ".csv") out_table.save_csv(cmd_units[1]);
+    else out_table.save_text(naked_name, exten_name);
+    return;
+}
+
 int main(int argc, char *argv[])
 {
     if (argc >= 2)
diff --git a/tool/dsviewer/dsviewer.h b/tool/dsviewer/dsviewer.h
index dcb64ad..21a687c 100644
--- a/tool/dsviewer/dsviewer.h
+++ b/tool/dsviewer/dsviewer.h
@@ -53,8 +53,12 @@ void save_file(const std::vector<std::string> &cmd_units);
 void statistic(const std::vector<std::string> &cmd_units);
 void set_enable(const std::vector<std::string> &cmd_units);
 void set_disable(const std::vector<std::string> &cmd_units);
+void set_titles(const std::vector<std::string> &cmd_units);
+void math_func(const std::vector<std::string> &cmd_units);
+void rand_data(const std::vector<std::string> &cmd_units);
+void filt_data(const std::vector<std::string> &cmd_units);
 
-#define CMD_NUM 10
+#define CMD_NUM 14
 const cmd_pair commands[CMD_NUM] = {
     {"quit", quit, "Quit the program."},
     {"info", info, "Show the table information."},
@@ -65,6 +69,10 @@ const cmd_pair commands[CMD_NUM] = {
     {"stats", statistic, "Calculate statistics of the selected columns."},
     {"enable", set_enable, "Enable column/row outputs by name or index."},
     {"disable", set_disable, "Disable column/row outputs by name or index."},
+    {"title", set_titles, "Set row and column titles."},
+    {"math", math_func, "Preform mathematic operations of column data."},
+    {"random", rand_data, "Generate random column data."},
+    {"filter", filt_data, "Filter column data by value."},
     {"null", nullptr, "null"}
 };