hilbert | Hilbert Transformation and inverse for Rust | Math library
kandi X-RAY | hilbert Summary
kandi X-RAY | hilbert Summary
The Hilbert crate implements the highly efficient Skilling algorithm for performing the Hilbert curve transformation and its inverse for points in two dimensions on up to points with thousands of dimensions in Rust. The original algorithm in C may be found in this conference article:. "Programming the Hilbert curve" by John Skilling. AIP Conference Proceedings 707, 381 (2004);
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QUESTION
I'm trying to calculate the relative phase between a time series of two angles. Using below, the angles are measured by the rotation derived from the xy points associated to Label A
and Label B
. The angles are moving in a similar direction for the first 3 time points and then deviate for the remaining 3 time points.
My understanding was that the relative phase calculation using a Hilbert transform signified that values closer to 0 ° referred to a pattern of coordination or in-phase. Conversely, values closer to 180° referred to asynchronous patterns or anti-phase. Yet when I export the results below I'm not seeing this?
...ANSWER
Answered 2021-Apr-27 at 19:24By your description I would simply use
QUESTION
Objective: to order list by first two characters only, when comparing two elements from a list if they are the same then keep the original order.
Snippet #1
...ANSWER
Answered 2020-Dec-24 at 19:29In the first algorithm when you use .split() you create a list of lists. So your variable (l) is equal to : [['Hilbert'], ['Godel'], ['Poincare'], ['Ramanujan'], ['Pochammer']] (sorry if I misspelled) so when you ask l[b][:2] you are asking for the first two elements of the list ['Poincare'] which is the list in position b of your initial list, and it is equal to ['Poincare']. So when it gets to ['Poincare'] > ['Pochammer'] it gives 'True'. Given that your lists are composed of only one element (ex. ['Hilbert']) it is able to sort them in the right way and the only problem is with ['Poincare'] - ['Pochammer'] Next time just do not use .split() in this situation but try with l.append(input('')). The .split() is better used for something like 'A B C D E'.split() or something like that.
QUESTION
I am using a dual channel DAQ with data streaming mode.
The output data will become an array, however, I just want a specific range of the data from it and do the calculation and analysis, otherwise too much data points will retard the system and cause the FIFO overflow.
Does C
code have a similar function like Matlab array(6000:7000)
?
Here is my code to get the channel 1 and channel 2 data and I want to select a specific range of data from the ch1Buffer[i]
and ch2Buffer[i]
ANSWER
Answered 2020-Dec-22 at 12:30Does C code have a similar function like Matlab array(6000:7000)?
Yes, it's called memcpy
. But being C, it is harder to use and it is unaware of the structure and size of your data.
QUESTION
I need to calculate the Hilbert transform and get its absolute number from my signal. I installed the FFTW and followed these YouTube tutorials, both worked good.
However, I implemented the Hilbert Transform as the video did, I didn't obtain the value as same as Matlab calculated.
I've read some of the people who solved this problem by just using the FFT and doing other calculations, but they didn't give the answer clear enough. Could anyone provide me several lines of code which based on the FFTW so that can let result become same to Matlab calculated result?
Here is the Hilbert transform code which I followed the video:
...ANSWER
Answered 2020-Dec-08 at 17:11I have some difficulty to understand your code.
Here is my test code, on a simple N=4 case.
It should work at least for all even sizes of the input. To be checked with odd input.
This code calculates the analytic signal. The hilbert
function of matlab does the same.
The real part of it corresponds to the input real signal.
The Hilbert transform corresponds to the imaginary value.
The principle is to insure that the value of its FFT for negative frequencies is zero.
This is obtained by a simple windowing in the frequency domain.
QUESTION
i am beginner in html and css and when i was trying to build this web page with it (html and css) ,the images always appears in the middle of the tab and i don't know how to organize it,
stackoverflow keep saying "It looks like your post is mostly code; please add some more details" i have nothing more to say lol , so thank you in advance:)
this my html code:
...ANSWER
Answered 2020-Oct-30 at 11:55Consider deleting
QUESTION
I am currently working on a small project, in which a user can input on a GUI the nth iteration for a hilbert curve and the curve will be drawn with turtle and is displayed on the same window (not opening a new one). I have a calculate button, which seems to be working fine, and a restart button, which should clear the screen and reset Turtle to its initial state. This currently only works, if the process for the calculation of n has finished and the drawing too. So when you try to reset the function/process while turtle is still drawing it goes crazy. I guess I have to redefine my clear function or I seem to miss something very easy. I think I have to do a conditional statement there like, if the process (main) is unfinished, do this and that. I can't come up with it and hope for help.
Here is the code (I hope the german does not interfer with understanding it):
...ANSWER
Answered 2020-Oct-03 at 04:38Your problem is that Hilbert is recursive and that there is nothing in it to stop it until it reached the end with n==0. The only way I found to circumvent this, goes as follows: We define a global boolean variable named Flag which will carry the information that we want to stop.
My suggestion involves 3 modifications and goes like this:
In the "main()" section:
QUESTION
all. I am working on a custom-build API built in PHP. I have an array (see below) that has been returned from my database access object. When I use the json_encode
function, the int value assigned to phone1Type gets encoded incorrectly. I have tried this with multiple records, and the value in the encoded json object always matches the phone2Type. Any ideas as to what might be going on? (I've included two sample arrays below in addition to their corresponding json object.)
The code that I'm using to check the array and json values is the following:
...ANSWER
Answered 2020-Sep-22 at 18:30So, embarrassingly, this was just caused by an initial typo and then forgetfulness on my part.
- In the Adult.php model class, I has implemented the
JsonSerializable
interface to make sure that an Adult object could be encoded in Json. When doing so, I made a typographical error when building the array:
QUESTION
I'm working with the MEG signal and to address the problem of spatial leakage I wanted to perform orthogonalization of the time series. To have better understanding I started working with a sine signal. I wrote a code in python and to orthogonalize I used a function in [spectral python][1] module. If you run the following code and plot the signal, you will find something like shown in attached picture. I think the orthogonalize signal should also looks like the original signal. It should not change drastically. Please let me know if there are better ways to orthogonalize a signal. [enter image description here][2] Here is my code:
...ANSWER
Answered 2020-Jul-24 at 12:32The problem is that sig1
is just a scalar multiple of sig
so there is no orthogonal component between the two signals. The black orthogonal component you are plotting is just noise due to machine precision/roundoff. Try this instead:
QUESTION
I want to make a scenery with this code of fractals, and I need the fill color to change every second. I've tried a for-loop to redraw the whole thing, but that interferes with the other parts of my code that shouldn't be repeated
Is there a way turtle-graphics lets us change the fill color? Thanks in advance!
...ANSWER
Answered 2020-May-22 at 21:47Encapsulating the drawing code in functions, and adding a timer, behind the scenes we can redraw it every second with a different background color. This leaves you free to use the turtle to draw other things while the background color changes:
QUESTION
I have to calculate the distance on a hilbert-curve from 2D-Coordinates. With the hilbertcurve-package i built my own "hilbert"-function, to do so. The coordinates are stored in a dataframe (col_1 and col_2). As you see, my function works when applied to two values (test).
However it just does not work when applied row wise via apply-function! Why is this? what am I doing wrong here? I need an additional column "hilbert" with the hilbert-distances from the x- and y-coordinate given in columns "col_1" and "col_2".
...ANSWER
Answered 2020-May-21 at 19:33Since you have hilbert(df.col_1, df.col_2)
in the apply, that's immediately trying to call your function with the full pd.Series
es for those two columns, triggering that error. What you should be doing is:
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