diff --git a/lib/io/dsv_io.cpp b/lib/io/dsv_io.cpp
index a0e4e89..a7723dd 100644
--- a/lib/io/dsv_io.cpp
+++ b/lib/io/dsv_io.cpp
@@ -354,19 +354,22 @@ void gctl::geodsv_io::fill_column_point2dc(int xid, int yid, const array<point2d
         throw std::runtime_error("[gctl::geodsv_io] Invalid column index.");
     }
 
+    int st = 0;
+	if (thead_ == ColumnHead || thead_ == BothHead) st = 1;
+
     std::stringstream ss;
     std::string s;
-    for (size_t i = 0; i < std::min(row_num_, (int) data.size()); i++)
+    for (size_t i = 0; i < std::min(row_num_ - st, (int) data.size()); i++)
     {
         ss.clear();
         ss << data[i].x;
         ss >> s;
-        table_[i][xid].str_ = s;
+        table_[i + st][xid].str_ = s;
 
         ss.clear();
         ss << data[i].y;
         ss >> s;
-        table_[i][yid].str_ = s;
+        table_[i + st][yid].str_ = s;
     }
     return;
 }
@@ -389,22 +392,22 @@ void gctl::geodsv_io::fill_column_point3dc(int xid, int yid, int zid, const arra
 
     std::stringstream ss;
     std::string s;
-    for (size_t i = st; i < std::min(row_num_, (int) data.size()); i++)
+    for (size_t i = 0; i < std::min(row_num_ - st, (int) data.size()); i++)
     {
         ss.clear();
-        ss << data[i - st].x;
+        ss << data[i].x;
         ss >> s;
-        table_[i][xid].str_ = s;
+        table_[i + st][xid].str_ = s;
 
         ss.clear();
-        ss << data[i - st].y;
+        ss << data[i].y;
         ss >> s;
-        table_[i][yid].str_ = s;
+        table_[i + st][yid].str_ = s;
 
         ss.clear();
-        ss << data[i - st].z;
+        ss << data[i].z;
         ss >> s;
-        table_[i][zid].str_ = s;
+        table_[i + st][zid].str_ = s;
     }
     return;
 }
diff --git a/lib/io/dsv_io.h b/lib/io/dsv_io.h
index 8e0fb72..4ff10ba 100644
--- a/lib/io/dsv_io.h
+++ b/lib/io/dsv_io.h
@@ -60,6 +60,7 @@ namespace gctl
 				ss << in;
 				ss >> str_;
 			}
+			else if constexpr (std::is_same<T, std::string>::value) str_ = in;
 			else str_ = std::to_string(in);
 			return;
 		}
@@ -377,9 +378,9 @@ namespace gctl
 		int st = 0;
 		if (thead_ == ColumnHead || thead_ == BothHead) st = 1;
 		
-		for (size_t i = st; i < std::min(row_num_, data.size()); i++)
+		for (size_t i = 0; i < std::min(row_num_ - st, (int) data.size()); i++)
 		{
-			table_[i][idx].value(data[i - st], p);
+			table_[i + st][idx].value(data[i], p);
 		}
 		return;
 	}
@@ -402,9 +403,9 @@ namespace gctl
 		int st = 0;
 		if (thead_ == RowHead || thead_ == BothHead) st = 1;
 
-		for (size_t i = st; i < std::min(col_num_, data.size()); i++)
+		for (size_t i = 0; i < std::min(col_num_ - st, (int) data.size()); i++)
 		{
-			table_[idx][i].value(data[i - st], p);
+			table_[idx][i + st].value(data[i], p);
 		}
 		return;
 	}
@@ -413,6 +414,7 @@ namespace gctl
 	void dsv_io::fill_row(std::string name, const array<T> &data, int p)
 	{
 		fill_row(name_index(name, true), data, p);
+		return;
 	}
 
 	template <typename T>
@@ -438,6 +440,7 @@ namespace gctl
 	void dsv_io::get_column(std::string name, array<T> &data)
 	{
 		get_column(name_index(name, false), data);
+		return;
 	}
 
 	template <typename T>
@@ -463,6 +466,7 @@ namespace gctl
 	void dsv_io::get_row(std::string name, array<T> &data)
 	{
 		get_row(name_index(name, true), data);
+		return;
 	}
 
 	/**