How to symbolic differentiation of dot product?
0
The following code gives 0, instead of 2*x1. I tried a lot, searched a lot, but not found the correct code. Maybe I missed something.
xx = Matrix(3,1,symbols('x1:4'))
diff(xx.dot(xx), x1)
Update
Sorry, the original code is
import sympy as sym
from sympy import diff, symbols, Matrix
x1, x2, x3 = sym.symbols("x1, x2, x3", real=True)
xx = Matrix(3,1,symbols('x1:4'))
diff(xx.dot(xx), x1)
The solution for my problem is to drop out the "real=True".
python-3.x matrix sympy symbolic-math
asked Nov 18 '18 at 11:57
vesszabovesszabo
1135
add a comment |
0
The following code gives 0, instead of 2*x1. I tried a lot, searched a lot, but not found the correct code. Maybe I missed something.
xx = Matrix(3,1,symbols('x1:4'))
diff(xx.dot(xx), x1)
Update
Sorry, the original code is
import sympy as sym
from sympy import diff, symbols, Matrix
x1, x2, x3 = sym.symbols("x1, x2, x3", real=True)
xx = Matrix(3,1,symbols('x1:4'))
diff(xx.dot(xx), x1)
The solution for my problem is to drop out the "real=True".
python-3.x matrix sympy symbolic-math
asked Nov 18 '18 at 11:57
vesszabovesszabo
1135
xx is a column vector with entries x1, x2, x3. And xx.dot(xx) is equal to x1^2 + x2^2 + x3^2. from sympy import Matrix .
– vesszabo
Nov 18 '18 at 12:45
@user202729 You are right :-) Done.
– vesszabo
Nov 18 '18 at 13:48
add a comment |
0
0
0
The following code gives 0, instead of 2*x1. I tried a lot, searched a lot, but not found the correct code. Maybe I missed something.
xx = Matrix(3,1,symbols('x1:4'))
diff(xx.dot(xx), x1)
Update
Sorry, the original code is
import sympy as sym
from sympy import diff, symbols, Matrix
x1, x2, x3 = sym.symbols("x1, x2, x3", real=True)
xx = Matrix(3,1,symbols('x1:4'))
diff(xx.dot(xx), x1)
The solution for my problem is to drop out the "real=True".
python-3.x matrix sympy symbolic-math
asked Nov 18 '18 at 11:57
vesszabovesszabo
1135
The following code gives 0, instead of 2*x1. I tried a lot, searched a lot, but not found the correct code. Maybe I missed something.
xx = Matrix(3,1,symbols('x1:4'))
diff(xx.dot(xx), x1)
Update
Sorry, the original code is
import sympy as sym
from sympy import diff, symbols, Matrix
x1, x2, x3 = sym.symbols("x1, x2, x3", real=True)
xx = Matrix(3,1,symbols('x1:4'))
diff(xx.dot(xx), x1)
The solution for my problem is to drop out the "real=True".
python-3.x matrix sympy symbolic-math
python-3.x matrix sympy symbolic-math
asked Nov 18 '18 at 11:57
vesszabovesszabo
1135
asked Nov 18 '18 at 11:57
vesszabovesszabo
1135
edited Nov 18 '18 at 13:46
vesszabo
asked Nov 18 '18 at 11:57
vesszabovesszabo
1135
asked Nov 18 '18 at 11:57
vesszabovesszabo
1135
asked Nov 18 '18 at 11:57
vesszabovesszabo
1135
1135
xx is a column vector with entries x1, x2, x3. And xx.dot(xx) is equal to x1^2 + x2^2 + x3^2. from sympy import Matrix .
– vesszabo
Nov 18 '18 at 12:45
@user202729 You are right :-) Done.
– vesszabo
Nov 18 '18 at 13:48
add a comment |
xx is a column vector with entries x1, x2, x3. And xx.dot(xx) is equal to x1^2 + x2^2 + x3^2. from sympy import Matrix .
– vesszabo
Nov 18 '18 at 12:45
@user202729 You are right :-) Done.
– vesszabo
Nov 18 '18 at 13:48
xx is a column vector with entries x1, x2, x3. And xx.dot(xx) is equal to x1^2 + x2^2 + x3^2. from sympy import Matrix .
– vesszabo
Nov 18 '18 at 12:45
xx is a column vector with entries x1, x2, x3. And xx.dot(xx) is equal to x1^2 + x2^2 + x3^2. from sympy import Matrix .
– vesszabo
Nov 18 '18 at 12:45
@user202729 You are right :-) Done.
– vesszabo
Nov 18 '18 at 13:48
@user202729 You are right :-) Done.
– vesszabo
Nov 18 '18 at 13:48
add a comment |
0
active
oldest
votes
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
});
}
});
draft saved
draft discarded
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%2f53360608%2fhow-to-symbolic-differentiation-of-dot-product%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
draft saved
draft discarded
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.
draft saved
draft discarded
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%2f53360608%2fhow-to-symbolic-differentiation-of-dot-product%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
xx is a column vector with entries x1, x2, x3. And xx.dot(xx) is equal to x1^2 + x2^2 + x3^2. from sympy import Matrix .
– vesszabo
Nov 18 '18 at 12:45
@user202729 You are right :-) Done.
– vesszabo
Nov 18 '18 at 13:48