diff --git a/p3/lrls/arx.go b/p3/lrls/arx.go
index 4db8400..b02acee 100644
--- a/p3/lrls/arx.go
+++ b/p3/lrls/arx.go
@@ -13,9 +13,9 @@ const (
 // Estimate runs the selected method to estimate parameters of ARX model,
 // returns them and the error of the estimate. valid estimation method values
 // are 0 for explicit and 1 for recursive.
-// the function returns [][]float64 of parameter estimates, ([][]float64 of
-// error values, nil for error) on happy path, (nil, nil, err) otherwise.
-func Estimate(eMethod int, u, y [][]float64) ([][]float64, [][]float64, error) {
+// the function returns [][]float64 of parameter estimates, ([]float64 of error
+// values, nil for error) on happy path, (nil, nil, err) otherwise.
+func Estimate(eMethod int, u, y []float64) ([][]float64, []float64, error) {
 	if eMethod < 0 || eMethod > 1 {
 		log.Printf("error: estimation method needs to be from the set {0, 1}, got: %d", eMethod)
 
@@ -24,7 +24,7 @@ func Estimate(eMethod int, u, y [][]float64) ([][]float64, [][]float64, error) {
 
 	method := eMethod
 	estimates := make([][]float64, 0)
-	errs := make([][]float64, 0)
+	errs := make([]float64, 0)
 
 	var err error
 
diff --git a/p3/lrls/explicit.go b/p3/lrls/explicit.go
index 2fe17e0..1dac4c5 100644
--- a/p3/lrls/explicit.go
+++ b/p3/lrls/explicit.go
@@ -1,5 +1,5 @@
 package lrls
 
-func explicit(u, y [][]float64) ([][]float64, [][]float64, error) {
+func explicit(u, y []float64) ([][]float64, []float64, error) {
 	return nil, nil, nil
 }
diff --git a/p3/lrls/recursive.go b/p3/lrls/recursive.go
index 51b8440..314ea48 100644
--- a/p3/lrls/recursive.go
+++ b/p3/lrls/recursive.go
@@ -1,5 +1,5 @@
 package lrls
 
-func recursive(u, y [][]float64) ([][]float64, [][]float64, error) {
+func recursive(u, y []float64) ([][]float64, []float64, error) {
 	return nil, nil, nil
 }