diff --git a/libs/main/containers/picontainers.h b/libs/main/containers/picontainers.h
index 26528c0f..05891bdd 100644
--- a/libs/main/containers/picontainers.h
+++ b/libs/main/containers/picontainers.h
@@ -159,4 +159,14 @@ template <typename C> _PIReverseWrapper<C> PIReverseWrap(const C & c) {return _P
 #define piForeachRC(i, c) for(const i : PIReverseWrap(c))
 #define piForeachCR piForeachRC
 
+
+//! \~\brief
+//! \~english Reshape order enum for reshape() function.
+//! \~russian Порядок обхода для функции изменения размерности reshape().
+//! \~ \sa \a PIVector::reshape(), \a PIDeque::reshape()
+enum ReshapeOrder {
+	ReshapeByRow,
+	ReshapeByColumn
+};
+
 #endif // PICONTAINERS_H
diff --git a/libs/main/containers/pivector.h b/libs/main/containers/pivector.h
index a343ce74..6e899991 100644
--- a/libs/main/containers/pivector.h
+++ b/libs/main/containers/pivector.h
@@ -211,14 +211,6 @@ public:
 		return *this;
 	}
 
-	//! \~\brief
-	//! \~english Reshape order enum for \a reshape() function.
-	//! \~russian Порядок обхода для функции изменения размерности \a reshape().
-	enum ReshapeOrder {
-		byRow,
-		byColumn
-	};
-
 	class iterator {
 		friend class PIVector<T>;
 	private:
@@ -1939,22 +1931,36 @@ public:
 		return ret;
 	}
 
-	inline PIVector<PIVector<T>> reshape(size_t rows, size_t cols, ReshapeOrder order = byRow) const {
-		PIVector<PIVector<T>> ret;
-		if (isEmpty()) return ret;
+	//! \brief
+	//! \~english Changes the dimension of the array, creates a two-dimensional array from a one-dimensional array.
+	//! \~russian Изменяет размерность массива, из одномерного массива создает двухмерный.
+	//! \~\details
+	//! \~russian
+	//! \~english
+	//! \~\code
+	//! PIVector<int> v{1, 2, 3, 4};
+	//! PIVector<PIVector<int>> m1 = v.reshape(2,2);
+	//! piCout << m1; // {{1, 2}, {3, 4}}
+	//! PIVector<PIVector<int>> m2 = v.reshape(2,2, ReshapeByColumn);
+	//! piCout << m2; // {{1, 3}, {2, 4}}
+	//! \endcode
+	//! \~\sa \a map(), \a reduce()
+	inline PIVector<PIVector<T>> reshape(size_t rows, size_t cols, ReshapeOrder order = ReshapeByRow) const {
 #ifndef NDEBUG
 		if (rows*cols != piv_size) {
 			printf("error with PIVector<%s>::reshape\n", __PIP_TYPENAME__(T));
 		}
 #endif
 		assert(rows*cols == piv_size);
+		PIVector<PIVector<T>> ret;
+		if (isEmpty()) return ret;
 		ret.resize(rows);
-		if (order == byRow) {
+		if (order == ReshapeByRow) {
 			for (size_t r = 0; r < rows; r++) {
 				ret[r] = PIVector<T>(&(piv_data[r*cols]), cols);
 			}
 		}
-		if (order == byColumn) {
+		if (order == ReshapeByColumn) {
 			for (size_t r = 0; r < rows; r++) {
 				ret[r].resize(cols);
 				for (size_t c = 0; c < cols; c++) {
@@ -1968,18 +1974,18 @@ public:
 	template<typename C, typename std::enable_if<
 				 std::is_same<T, PIVector<C>>::value
 				 , int>::type = 0>
-	inline PIVector<C> reshape(ReshapeOrder order = byRow) const {
+	inline PIVector<C> flat(ReshapeOrder order = ReshapeByRow) const {
 		PIVector<C> ret;
 		if (isEmpty()) return ret;
 		size_t rows = size();
 		size_t cols = at(0).size();
 		ret.reserve(rows * cols);
-		if (order == byRow) {
+		if (order == ReshapeByRow) {
 			for (size_t r = 0; r < rows; r++) {
 				ret.append(at(r));
 			}
 		}
-		if (order == byColumn) {
+		if (order == ReshapeByColumn) {
 			for (size_t c = 0; c < cols; c++) {
 				for (size_t r = 0; r < rows; r++) {
 					ret << at(r)[c];
@@ -1990,6 +1996,37 @@ public:
 		return ret;
 	}
 
+	template<typename C, typename std::enable_if<
+				 std::is_same<T, PIVector<C>>::value
+				 , int>::type = 0>
+	inline PIVector<PIVector<C>> reshape(size_t rows, size_t cols, ReshapeOrder order = ReshapeByRow) const {
+#ifndef NDEBUG
+		if (rows*cols != piv_size) {
+			printf("error with PIVector<%s>::reshape\n", __PIP_TYPENAME__(T));
+		}
+#endif
+		assert(rows*cols == piv_size);
+		PIVector<PIVector<C>> ret;
+		if (isEmpty()) return ret;
+//		size_t old_rows = size();
+//		size_t old_cols = at(0).size();
+//		ret.resize(rows);
+//		if (order == ReshapeByRow) {
+//			for (size_t r = 0; r < rows; r++) {
+//				ret.append(at(r));
+//			}
+//		}
+//		if (order == ReshapeByColumn) {
+//			for (size_t c = 0; c < cols; c++) {
+//				for (size_t r = 0; r < rows; r++) {
+//					ret << at(r)[c];
+//				}
+//			}
+//		}
+//		ret.resize(rows * cols);
+		return ret;
+	}
+
 private:
 	inline void _reset() {piv_size = piv_rsize = 0; piv_data = 0;}
 	inline size_t asize(size_t s) {
@@ -2086,7 +2123,6 @@ private:
 };
 
 
-
 #ifdef PIP_STD_IOSTREAM
 //! \~english Output operator to [std::ostream](https://en.cppreference.com/w/cpp/io/basic_ostream).
 //! \~russian Оператор вывода в [std::ostream](https://ru.cppreference.com/w/cpp/io/basic_ostream).
@@ -2124,5 +2160,4 @@ inline PICout operator <<(PICout s, const PIVector<T> & v) {
 template<typename T>
 inline void piSwap(PIVector<T> & f, PIVector<T> & s) {f.swap(s);}
 
-
 #endif // PIVECTOR_H
diff --git a/main.cpp b/main.cpp
index a0017d6f..1316a65f 100644
--- a/main.cpp
+++ b/main.cpp
@@ -62,33 +62,8 @@ PICout operator <<(PICout s, const ConstChars & v) {
 }
 
 int main(int argc, char * argv[]) {
-//	const char * dd = "12345";
-//	char text[]{ "hello" };
-//	ConstChars s("test");
-//	piCout << s;
-//	ConstChars s2;
-//	piCout << s2;
-//	s2 = s;
-//	piCout << s2;
-//	s2 = text;
-//	s = s2;
-//	piCout << s << s2;
-////	s2 = s;
-//	text[1] = '0';
-//	piCout << text;
-//	piCout << s << s2 << ConstChars(text, 3);
-////	piCout << s << s2;
-////	PIString ss(s.data(), s.length());
-////	piCout << ss;
-//	PICout(PICoutManipulators::DefaultControls | PICoutManipulators::AddQuotes) << PIString(dd);
-
-//	piCout << PIString::fromUTF8("test");
-//	piCout << PIString::fromUTF8("бюд\n");
-//	piCout.writePIString(PIString::fromUTF8("test\n"));
-//	piCout.writePIString(PIString::fromUTF8("бюд\n"));
-//	piCout << "бюд\n";
-	PIVector<int> v{1, 2, 3, 4, 5};
-	int s = v.reduce<int>([](int e, int acc){return acc + e;});
-	piCout << s; // 15
+	PIVector<int> v{1, 2, 3, 4};
+	PIVector<PIVector<int>> v2 = v.reshape(2,2, ReshapeByRow);
+	piCout << v2;
 	return 0;
 }