diff --git a/sql/vector--0.6.2--0.7.0.sql b/sql/vector--0.6.2--0.7.0.sql
index 3fdc8f1..3d45d49 100644
--- a/sql/vector--0.6.2--0.7.0.sql
+++ b/sql/vector--0.6.2--0.7.0.sql
@@ -203,6 +203,9 @@ CREATE FUNCTION cosine_distance(sparsevec, sparsevec) RETURNS float8
 CREATE FUNCTION sparsevec_norm(sparsevec) RETURNS float8
 	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
+CREATE FUNCTION subvector(sparsevec, int, int) RETURNS sparsevec
+	AS 'MODULE_PATHNAME', 'sparsevec_subvector' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
+
 CREATE FUNCTION sparsevec_l2_squared_distance(sparsevec, sparsevec) RETURNS float8
 	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
diff --git a/sql/vector.sql b/sql/vector.sql
index c694b1c..06c831d 100644
--- a/sql/vector.sql
+++ b/sql/vector.sql
@@ -512,6 +512,9 @@ CREATE FUNCTION cosine_distance(sparsevec, sparsevec) RETURNS float8
 CREATE FUNCTION sparsevec_norm(sparsevec) RETURNS float8
 	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
+CREATE FUNCTION subvector(sparsevec, int, int) RETURNS sparsevec
+	AS 'MODULE_PATHNAME', 'sparsevec_subvector' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
+
 -- sparsevec private functions
 
 CREATE FUNCTION sparsevec_l2_squared_distance(sparsevec, sparsevec) RETURNS float8
diff --git a/src/sparsevec.c b/src/sparsevec.c
index 22649cd..a288297 100644
--- a/src/sparsevec.c
+++ b/src/sparsevec.c
@@ -776,3 +776,56 @@ sparsevec_norm(PG_FUNCTION_ARGS)
 
 	PG_RETURN_FLOAT8(sqrt(norm));
 }
+
+/*
+ * Get a subvector
+ */
+PGDLLEXPORT PG_FUNCTION_INFO_V1(sparsevec_subvector);
+Datum
+sparsevec_subvector(PG_FUNCTION_ARGS)
+{
+	SparseVector *a = PG_GETARG_SPARSEVEC_P(0);
+	int32		start = PG_GETARG_INT32(1);
+	int32		count = PG_GETARG_INT32(2);
+	int32		end = start + count;
+	float	   *ax = SPARSEVEC_VALUES(a);
+	SparseVector *result;
+	float	   *rx;
+	int			dim;
+	int			nnz = 0;
+	int			startIndex;
+
+	/* Indexing starts at 1, like substring */
+	if (start < 1)
+		start = 1;
+
+	if (end > a->dim)
+		end = a->dim + 1;
+
+	dim = end - start;
+	CheckDim(dim);
+	startIndex = dim;
+
+	for (startIndex = 0; startIndex < a->nnz; startIndex++)
+	{
+		if (a->indices[startIndex] >= start - 1)
+			break;
+	}
+
+	for (int i = startIndex; i < a->nnz; i++)
+	{
+		if (a->indices[i] < end - 1)
+			nnz++;
+	}
+
+	result = InitSparseVector(dim, nnz);
+	rx = SPARSEVEC_VALUES(result);
+
+	for (int i = 0; i < nnz; i++)
+	{
+		result->indices[i] = a->indices[startIndex + i];
+		rx[i] = ax[startIndex + i];
+	}
+
+	PG_RETURN_POINTER(result);
+}
diff --git a/test/expected/sparsevec_functions.out b/test/expected/sparsevec_functions.out
index 07117d8..2f2f4d0 100644
--- a/test/expected/sparsevec_functions.out
+++ b/test/expected/sparsevec_functions.out
@@ -60,3 +60,33 @@ SELECT cosine_distance('{}/1'::sparsevec, '{}/1');
 
 SELECT cosine_distance('{0:1}/2'::sparsevec, '{0:1}/3');
 ERROR:  different sparsevec dimensions 2 and 3
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, 1, 3);
+    subvector    
+-----------------
+ {0:1,1:2,2:3}/3
+(1 row)
+
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, 3, 2);
+  subvector  
+-------------
+ {2:3,3:4}/2
+(1 row)
+
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, -1, 3);
+ subvector 
+-----------
+ {0:1}/1
+(1 row)
+
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, 3, 9);
+    subvector    
+-----------------
+ {2:3,3:4,4:5}/3
+(1 row)
+
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, 1, 0);
+ERROR:  sparsevec must have at least 1 dimension
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, 3, -1);
+ERROR:  sparsevec must have at least 1 dimension
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, -1, 2);
+ERROR:  sparsevec must have at least 1 dimension
diff --git a/test/sql/sparsevec_functions.sql b/test/sql/sparsevec_functions.sql
index 86f7990..cf9bef8 100644
--- a/test/sql/sparsevec_functions.sql
+++ b/test/sql/sparsevec_functions.sql
@@ -11,3 +11,11 @@ SELECT cosine_distance('{0:1,1:1}/2'::sparsevec, '{0:-1,1:-1}/2');
 SELECT cosine_distance('{0:1}/2'::sparsevec, '{1:2}/2');
 SELECT cosine_distance('{}/1'::sparsevec, '{}/1');
 SELECT cosine_distance('{0:1}/2'::sparsevec, '{0:1}/3');
+
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, 1, 3);
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, 3, 2);
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, -1, 3);
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, 3, 9);
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, 1, 0);
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, 3, -1);
+SELECT subvector('{0:1,1:2,2:3,3:4,4:5}/5'::sparsevec, -1, 2);