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Merge pull request #29 from ev-br/patch-1

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mention `np.errstate` context manager in exercise 31.
This commit is contained in:
Nicolas P. Rougier
2016-10-30 06:59:41 +01:00
committed by GitHub
parent e8ad2e1123 8cbaacc259
commit ac525959c9
2 changed files with 25 additions and 12 deletions
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16
100 Numpy exercises.ipynb
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@@ -477,8 +477,8 @@
"outputs": [], "outputs": [],
"source": [ "source": [
"Z = np.dot(np.ones((5,3)), np.ones((3,2)))\n", "Z = np.dot(np.ones((5,3)), np.ones((3,2)))\n",
"print(Z)", "print(Z)\n",
"\n\n", "\n",
"# Alternative solution, in Python 3.5 and above\n", "# Alternative solution, in Python 3.5 and above\n",
"Z = np.ones((5,3)) @ np.ones((3,2))" "Z = np.ones((5,3)) @ np.ones((3,2))"
] ]
@@ -628,10 +628,16 @@
"source": [ "source": [
"# Suicide mode on\n", "# Suicide mode on\n",
"defaults = np.seterr(all=\"ignore\")\n", "defaults = np.seterr(all=\"ignore\")\n",
"Z = np.ones(1)/0\n", "Z = np.ones(1) / 0\n",
"\n", "\n",
"# Back to sanity\n", "# Back to sanity\n",
"_ = np.seterr(**defaults)" "_ = np.seterr(**defaults)\n",
"\n",
"An equivalent way, with a context manager:\n",
"\n",
"```python\n",
"with np.errstate(divide='ignore'):\n",
" Z = np.ones(1) / 0"
] ]
}, },
{ {
@@ -2334,7 +2340,7 @@
"name": "python", "name": "python",
"nbconvert_exporter": "python", "nbconvert_exporter": "python",
"pygments_lexer": "ipython3", "pygments_lexer": "ipython3",
"version": "3.5.2" "version": "3.5.1"
} }
}, },
"nbformat": 4, "nbformat": 4,

9
100 Numpy exercises.md
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@@ -282,12 +282,19 @@ print(np.intersect1d(Z1,Z2))
```python ```python
# Suicide mode on # Suicide mode on
defaults = np.seterr(all="ignore") defaults = np.seterr(all="ignore")
Z = np.ones(1)/0 Z = np.ones(1) / 0
# Back to sanity # Back to sanity
_ = np.seterr(**defaults) _ = np.seterr(**defaults)
``` ```
An equivalent way, with a context manager:
```python
with np.errstate(divide='ignore'):
Z = np.ones(1) / 0
```
#### 32. Is the following expressions true? (★☆☆) #### 32. Is the following expressions true? (★☆☆)