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-rw-r--r--INSTALL.rst.txt5
-rw-r--r--numpy/lib/function_base.py2
2 files changed, 6 insertions, 1 deletions
diff --git a/INSTALL.rst.txt b/INSTALL.rst.txt
index 8b135e309..6f96daabf 100644
--- a/INSTALL.rst.txt
+++ b/INSTALL.rst.txt
@@ -61,6 +61,11 @@ To perform an inplace build that can be run from the source folder run::
python setup.py build_ext --inplace -j 4
+Note that the ``python`` command here is the system default Python, generally
+python 2, the ``python3`` command may be needed to install on python 3.
+See `Requirements for Installing Packages <https://packaging.python.org/tutorials/installing-packages/>`_
+for more details.
+
The number of build jobs can also be specified via the environment variable
NPY_NUM_BUILD_JOBS.
diff --git a/numpy/lib/function_base.py b/numpy/lib/function_base.py
index 504280cef..e61122107 100644
--- a/numpy/lib/function_base.py
+++ b/numpy/lib/function_base.py
@@ -839,7 +839,7 @@ def gradient(f, *varargs, **kwargs):
\\left\\{
\\begin{array}{r}
\\alpha+\\beta+\\gamma=0 \\\\
- -\\beta h_{d}+\\gamma h_{s}=1 \\\\
+ \\beta h_{d}-\\gamma h_{s}=1 \\\\
\\beta h_{d}^{2}+\\gamma h_{s}^{2}=0
\\end{array}
\\right.