Mixing
overriding partially an numpy array does not work
I tried to override a numpy array partially
does anyone know how to do that in such comfort indexing way?
Thanks!
python numpy numpy-ndarray
asked Nov 20 '18 at 19:19
malochomalocho
3618
add a comment |
I tried to override a numpy array partially
does anyone know how to do that in such comfort indexing way?
Thanks!
python numpy numpy-ndarray
asked Nov 20 '18 at 19:19
malochomalocho
3618
add a comment |
I tried to override a numpy array partially
does anyone know how to do that in such comfort indexing way?
Thanks!
python numpy numpy-ndarray
asked Nov 20 '18 at 19:19
malochomalocho
3618
I tried to override a numpy array partially
does anyone know how to do that in such comfort indexing way?
Thanks!
python numpy numpy-ndarray
python numpy numpy-ndarray
asked Nov 20 '18 at 19:19
malochomalocho
3618
asked Nov 20 '18 at 19:19
malochomalocho
3618
asked Nov 20 '18 at 19:19
malochomalocho
3618
asked Nov 20 '18 at 19:19
malochomalocho
3618
asked Nov 20 '18 at 19:19
malochomalocho
3618
3618
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Setup
a = np.array([[1,2,3], [1,1,1], [1,1,1]])
b = np.array([[888,888], [99, 99]])
You are operating on a copy of the array, so the modifications are not persisted, use numpy.ix_ here:
>>> a[np.ix_([1,2], [0,1])] = b
>>> a
array([[ 1, 2, 3],
[888, 888, 1],
[ 99, 99, 1]])
answered Nov 20 '18 at 19:26
user3483203user3483203
30.8k82454
add a comment |
You can also use this sort of indexing with the : separating your starting and ending indices:
>>> a = np.array([[1,2,3], [1,1,1], [1,1,1]])
# 1: and :2 all_indices_after_1 and all_indices_before_2 respectively
>>> a[1:,:2] = np.array([[888,888], [99, 99]])
>>> a
array([[ 1, 2, 3],
[888, 888, 1],
[ 99, 99, 1]])
answered Nov 20 '18 at 19:29
sacuLsacuL
30.1k41840
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53400063%2foverriding-partially-an-numpy-array-does-not-work%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Setup
a = np.array([[1,2,3], [1,1,1], [1,1,1]])
b = np.array([[888,888], [99, 99]])
You are operating on a copy of the array, so the modifications are not persisted, use numpy.ix_ here:
>>> a[np.ix_([1,2], [0,1])] = b
>>> a
array([[ 1, 2, 3],
[888, 888, 1],
[ 99, 99, 1]])
answered Nov 20 '18 at 19:26
user3483203user3483203
30.8k82454
add a comment |
Setup
a = np.array([[1,2,3], [1,1,1], [1,1,1]])
b = np.array([[888,888], [99, 99]])
You are operating on a copy of the array, so the modifications are not persisted, use numpy.ix_ here:
>>> a[np.ix_([1,2], [0,1])] = b
>>> a
array([[ 1, 2, 3],
[888, 888, 1],
[ 99, 99, 1]])
answered Nov 20 '18 at 19:26
user3483203user3483203
30.8k82454
add a comment |
Setup
a = np.array([[1,2,3], [1,1,1], [1,1,1]])
b = np.array([[888,888], [99, 99]])
You are operating on a copy of the array, so the modifications are not persisted, use numpy.ix_ here:
>>> a[np.ix_([1,2], [0,1])] = b
>>> a
array([[ 1, 2, 3],
[888, 888, 1],
[ 99, 99, 1]])
answered Nov 20 '18 at 19:26
user3483203user3483203
30.8k82454
Setup
a = np.array([[1,2,3], [1,1,1], [1,1,1]])
b = np.array([[888,888], [99, 99]])
You are operating on a copy of the array, so the modifications are not persisted, use numpy.ix_ here:
>>> a[np.ix_([1,2], [0,1])] = b
>>> a
array([[ 1, 2, 3],
[888, 888, 1],
[ 99, 99, 1]])
answered Nov 20 '18 at 19:26
user3483203user3483203
30.8k82454
answered Nov 20 '18 at 19:26
user3483203user3483203
30.8k82454
answered Nov 20 '18 at 19:26
user3483203user3483203
30.8k82454
answered Nov 20 '18 at 19:26
user3483203user3483203
30.8k82454
30.8k82454
add a comment |
add a comment |
You can also use this sort of indexing with the : separating your starting and ending indices:
>>> a = np.array([[1,2,3], [1,1,1], [1,1,1]])
# 1: and :2 all_indices_after_1 and all_indices_before_2 respectively
>>> a[1:,:2] = np.array([[888,888], [99, 99]])
>>> a
array([[ 1, 2, 3],
[888, 888, 1],
[ 99, 99, 1]])
answered Nov 20 '18 at 19:29
sacuLsacuL
30.1k41840
add a comment |
You can also use this sort of indexing with the : separating your starting and ending indices:
>>> a = np.array([[1,2,3], [1,1,1], [1,1,1]])
# 1: and :2 all_indices_after_1 and all_indices_before_2 respectively
>>> a[1:,:2] = np.array([[888,888], [99, 99]])
>>> a
array([[ 1, 2, 3],
[888, 888, 1],
[ 99, 99, 1]])
answered Nov 20 '18 at 19:29
sacuLsacuL
30.1k41840
add a comment |
You can also use this sort of indexing with the : separating your starting and ending indices:
>>> a = np.array([[1,2,3], [1,1,1], [1,1,1]])
# 1: and :2 all_indices_after_1 and all_indices_before_2 respectively
>>> a[1:,:2] = np.array([[888,888], [99, 99]])
>>> a
array([[ 1, 2, 3],
[888, 888, 1],
[ 99, 99, 1]])
answered Nov 20 '18 at 19:29
sacuLsacuL
30.1k41840
You can also use this sort of indexing with the : separating your starting and ending indices:
>>> a = np.array([[1,2,3], [1,1,1], [1,1,1]])
# 1: and :2 all_indices_after_1 and all_indices_before_2 respectively
>>> a[1:,:2] = np.array([[888,888], [99, 99]])
>>> a
array([[ 1, 2, 3],
[888, 888, 1],
[ 99, 99, 1]])
answered Nov 20 '18 at 19:29
sacuLsacuL
30.1k41840
edited Nov 20 '18 at 19:41
answered Nov 20 '18 at 19:29
sacuLsacuL
30.1k41840
answered Nov 20 '18 at 19:29
sacuLsacuL
30.1k41840
answered Nov 20 '18 at 19:29
sacuLsacuL
30.1k41840
30.1k41840
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53400063%2foverriding-partially-an-numpy-array-does-not-work%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
