Why and How to Change Between Bases

  Рет қаралды 506

Apastron

Apastron

Күн бұрын

Change of Basis :)
Also this video focuses primarily on finite dimensional vectors spaces, with real numbers.
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Chapters:
0:00 Introduction
0:18 What is a Basis?
2:27 Coordinate Vectors
4:23 Change of Basis
8:26 Transformations in Different Coordinates
9:32 Diagonalizing Matrices
12:08 Conclusion
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Music:
LEMMiNO - Encounters
• LEMMiNO - Encounters (...
CC BY-SA 4.0
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Relevant links:
Derivation of the change of basis matrix:
• Change of coordinates
Are change of basis always invertible? The answer is yes.
Link to proof that change of basis matrices are always invertible: math.stackexchange.com/questi....
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CORRECTIONS:
Let me know if you find any mistakes.
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Let me know about your thoughts on the video :)

Пікірлер: 9
@jakeaustria5445
@jakeaustria5445 5 күн бұрын
Thanks
@danieljulian4676
@danieljulian4676 14 күн бұрын
I like the tutorial; it's clear and concise. The musical accompaniment is perfect: It's got a mysterious quality to it, as if we are sneaking up on diagonalization from behind to find out that it's not really performing any magic tricks. You should keep making videos like this, when you have the time, so thanks!
@apastron11
@apastron11 14 күн бұрын
Thank you for the kind words! I am working on the next video, but it will take a while to finish
@danieljulian4676
@danieljulian4676 14 күн бұрын
@@apastron11 One point that I think could be made a little more clearly is that is some vector with respect to the standard basis, which isn't mentioned in the video. The hardest thing about change of basis is not the computation, but keeping track of which basis we are using to express coordinates. I still struggle to internalize it; I find that your animation is a little quick at around 8:15, so I replay the segment several times to make sure I follow the manipulations you're making. They are, of course, correct. The matrix Q is then the augmented side of the RREF of matrix for beta augmented by the matrix for gamma: We start by assuming the bases are linearly independent. Cheers, again!
@danieljulian4676
@danieljulian4676 14 күн бұрын
@@apastron11 Also, just after 10:05, my feeling is that you haven't adequately motivated the selection of the vectors in the basis set beta. In the preceding graphic, you showed that these directions are only scaled by operating on them with A. At least I think that's what you're showing. That would make these eigenvectors, and that is what we want when raising a matrix to a power. Please forgive me if I am only hopelessly confused by the way you have developed this step. I think this material would much better have been left for a subsequent presentation. It's a bit jarring the way you do it, because the concept of the eigenvectors seems to come out of nowhere. You didn't publish other videos to support this. It's as if you want to throw it in here because it's an important topic, but you should prepare the ground a bit more thoroughly.
@apastron11
@apastron11 14 күн бұрын
@@danieljulian4676 ​​⁠​⁠ Yes, those vectors are eigenvectors, but I didn’t want to get too much into their selection because eigenvectors are a such big topic. I feel like if I were to get into the details of how those vectors were found it would distract from the main idea of the video. I just wanted to show a case of change of basis simplifying a problem. I do see how this could have made it more confusing, but I didn't know what else I could have done without getting too much into the details. I am considering a video about eigenvectors in the near future.
@johnstuder847
@johnstuder847 14 күн бұрын
Thank you for your video. Could you make one for the SVD, singular value decomposition? I think it is a great motivator for linear algebra. Also, take a look at GoldPlatedGoof ‘Fourier for the rest of us’. Awesome video on using exponentials to represent closed curves. Would love to see your take on that.
@apastron11
@apastron11 14 күн бұрын
I have some other videos planned but I will look into these
@Peter-hz3vs
@Peter-hz3vs 19 күн бұрын
struggle a bit to understand. Maybe it i a bit too late to browse your channel. Anyway, Keep up the work bro
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