diff --git a/pandas_ta/momentum/cg.py b/pandas_ta/momentum/cg.py
index 6c49885..1379aa0 100644
--- a/pandas_ta/momentum/cg.py
+++ b/pandas_ta/momentum/cg.py
@@ -38,9 +38,9 @@ def cg(
     offset = v_offset(offset)
 
     # Calculate
-    coefficients = [length - i for i in range(0, length)]
-    numerator = -close.rolling(length).apply(weights(coefficients), raw=True)
-    cg = numerator / close.rolling(length).sum()
+    coefficients = range(1, length + 1)
+    numerator = close.rolling(length).apply(weights(coefficients), raw=True)
+    cg = -numerator / close.rolling(length).sum()
 
     # Offset
     if offset != 0:
diff --git a/pandas_ta/overlap/linreg.py b/pandas_ta/overlap/linreg.py
index c939cdb..3fb9b38 100644
--- a/pandas_ta/overlap/linreg.py
+++ b/pandas_ta/overlap/linreg.py
@@ -65,7 +65,7 @@ def linreg(
     # Calculate
     np_close = close.values
 
-    if Imports["talib"] and mode_tal:
+    if Imports["talib"] and mode_tal and not r:
         from talib import LINEARREG, LINEARREG_ANGLE, LINEARREG_INTERCEPT, LINEARREG_SLOPE, TSF
         if tsf:
             linreg = TSF(close, timeperiod=length)