lukepolson / youtube_channel

Notebooks for the python tutorials of my youtube channel. See specific youtube video for link to specifc notebook.

Youtube Channel Repository

youtube_channel's Issues

Vid 5: sum(hms) incorrect?

In the cell labelled In [126], you have

all_harmonics=True
if all_harmonics:
    tot = sol.sum(axis=1)[::10] # all harmonics
else:
    tot = sum(hms)[::10] # only first 10 harmonics
tot = tot.astype(np.float32)

When calculating with all_harmonics, you take the average y value across the string at each time t to generate your PCM sound stream (this makes sense). The average value of a periodic function is just the amplitude of its zeroth harmonic; summing all harmonic amplitudes at a timeslice t is a different calculation. You can check this by listening to WAVs with all_harmonics=True vs all_harmonics=False with a high number of harmonics and finding that they don't sound similar.

Edit: Actually I'm not sure if taking the average y value at each time t is correct, since even harmonic contributions to the average y would be zero. Here's an open SE question on the topic: https://physics.stackexchange.com/questions/574906/derive-shape-of-sound-wave-from-vibrating-string-simulation

CT scan data

Hi, I really liked the image processing you have done on CT scan image processing. I wanted to try with the data. I see that you have recently deleted the data. Could you please let me know where can I find the file?

Add a license file

Please choose a license and add a license file. I don't want to accidentally use any of your code without permission.

image "accordion.png"

Hello

where we can find the the image "accordion.png" for notebook 8 where you solve poisson equation?

thanks

Is it possible to also provide the fan beam filtered backprojection jupyter code in 2D and 3D cases?

Recently I watched your videos about filtered backprojection introductions on youtube, and I have the following problems:

1. Did you have some easy-to-get-started resources about how to make fan beam filtered backprojection (FBFBP) code in Python or Jupyter Notebook? Because circular arrray setups are more frequently used in real life. I don't want to use matlab or python built-in functions because some important codes are hidden in those functions.
2. Did you have resources about how to extend the FBFBP technique to 3D imaging?

I would be grateful if you can provide the corresponding resources, thank you!

CT_scan.npy

Hi
I need CT_scan.npy file that you used in liver segmentation video.
Please upload it
I appreciate it
Thank you

vid27.ipynb first image correction

Hi Luke, first thank you very much for your work on youtube and physics.
To the point! in the file vid27.ipynb the first image (sacnner.PNG) is not showing. excuse my boldness, could you correct it?
Thank you so much for your great work.

conservation of energy in multibody boltzmann simulation

I printed out the sum of squares of velocities in the simulation and observed the total energy varies over time.

https://github.com/lukepolson/youtube_channel/blob/main/Python%20GPU/multibody_boltzmann.ipynb

Interested in contributing your backprojection notebook to PyMedPhys

Hi @lukepolson :),

Would you be interested in contributing your back projection notebook to PyMedPhys?

It could sit within the "How-To" section of the docs PyMedPhys docs. Even though it isn't actually using the pymedphys library, the notebook itself would be of significant interest to Medical Physicists in training. You could certainly link back to your original notebook and your youtube video also.

Cheers,
Simon

Interested in teaching GUIs?

I'm coming from left-field as I don't watch your channel. I did notice some matplotlib, and a couple of tkinter GUIs. Have you looked at PySimpleGUI? It may fit well with the types of applications I see currently in your notebooks that could be instead run as GUIs.

I may be entirely wrong, which happens quite often, but I something I get one right.

Where can one find the image turkey.png?

vid9.ipynb attempts to open the file turkey.png in cell 63 using

img = color.rgb2gray(io.imread('../../output/turkey.png'))

Where is turkey.png?

Sam Dupree.