From b65a61b6c969f1b4030fa7f8e5490e4433d74447 Mon Sep 17 00:00:00 2001
From: Paul McCarthy <pauldmccarthy@gmail.com>
Date: Tue, 25 Jul 2017 12:04:40 +0100
Subject: [PATCH] New little function to normalise vectors. Sick of duplicating
this code everywhere.
---
fsl/utils/transform.py | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/fsl/utils/transform.py b/fsl/utils/transform.py
index 79ab8c414..481ae420f 100644
--- a/fsl/utils/transform.py
+++ b/fsl/utils/transform.py
@@ -22,6 +22,14 @@ spaces. The following functions are provided:
axisBounds
flirtMatrixToSform
sformToFlirtMatrix
+
+And a few more functions are provided for working with vectors:
+
+.. autosummary::
+ :nosignatures:
+
+ veclength
+ normalise
"""
import numpy as np
@@ -45,6 +53,16 @@ def concat(*xforms):
return result
+def veclength(vec):
+ """Returns the length of the given vector. """
+ return np.sqrt(np.dot(vec, vec))
+
+
+def normalise(vec):
+ """Normalises the given vector to unit length. """
+ return vec / veclength(vec)
+
+
def scaleOffsetXform(scales, offsets):
"""Creates and returns an affine transformation matrix which encodes
the specified scale(s) and offset(s).
--
GitLab