diff --git a/src/Function1D.cpp b/src/Function1D.cpp
index ee5e2a7..9458452 100644
--- a/src/Function1D.cpp
+++ b/src/Function1D.cpp
@@ -204,7 +204,7 @@ Aurora::Matrix Aurora::round(const Aurora::Matrix &&matrix) {
 Aurora::Matrix Aurora::floor(const Aurora::Matrix &matrix) {
     auto output = malloc(matrix.getDataSize());
     //for real part
-    vdRoundI(matrix.getDataSize(), matrix.getData(), SAME_STRIDE, output, SAME_STRIDE);
+    vdFloorI(matrix.getDataSize(), matrix.getData(), SAME_STRIDE, output, SAME_STRIDE);
     if (matrix.getValueType() == Complex) {
         //for imag part
         vdFloorI(matrix.getDataSize(), matrix.getData() + 1, SAME_STRIDE, output + 1, SAME_STRIDE);
@@ -214,7 +214,7 @@ Aurora::Matrix Aurora::floor(const Aurora::Matrix &matrix) {
 
 Aurora::Matrix Aurora::floor(const Aurora::Matrix &&matrix) {
     //for real part
-    vdRoundI(matrix.getDataSize(), matrix.getData(), SAME_STRIDE, matrix.getData(), SAME_STRIDE);
+    vdFloorI(matrix.getDataSize(), matrix.getData(), SAME_STRIDE, matrix.getData(), SAME_STRIDE);
     if (matrix.getValueType() == Complex) {
         //for imag part
         vdFloorI(matrix.getDataSize(), matrix.getData() + 1, SAME_STRIDE, matrix.getData() + 1, SAME_STRIDE);