411 | An Alert Management Web Application
kandi X-RAY | 411 Summary
kandi X-RAY | 411 Summary
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411 Key Features
411 Examples and Code Snippets
Community Discussions
Trending Discussions on 411
QUESTION
My dataset contains 2 variables Y and X. Y was measured every 1.0 seconds.
I am trying to calculate the average slope within a moving 60-second-window, i.e. after calculating the first 60-second slope value the window moves forward one time unit (1.0 seconds) and calculates the next 60-second-window, producing successive 60-second slope values at 1.0-second increments.
My data:
...ANSWER
Answered 2022-Mar-01 at 17:36You could do this with a loop:
QUESTION
I have the following 2 query plans for a particular query (second one was obtained by turning seqscan off):
The cost estimate for the second plan is lower than that for the first, however, pg only chooses the second plan if forced to do so (by turning seqscan off).
What could be causing this behaviour?
EDIT: Updating the question with information requested in a comment:
Output for EXPLAIN (ANALYZE, BUFFERS, VERBOSE)
for query 1 (seqscan on; does not use index). Also viewable at https://explain.depesz.com/s/cGLY:
ANSWER
Answered 2022-Feb-17 at 11:43You should have those two indexes to speed up your query :
QUESTION
I just downloaded pytube (version 11.0.1) and started with this code snippet from here:
...ANSWER
Answered 2021-Nov-22 at 07:03Found this issue, pytube v11.0.1. It's a little late for me, but if no one has submitted a fix tomorrow I'll check it out.
in C:\Python38\lib\site-packages\pytube\parser.py
Change this line:
152: func_regex = re.compile(r"function\([^)]+\)")
to this:
152: func_regex = re.compile(r"function\([^)]?\)")
The issue is that the regex expects a function with an argument, but I guess youtube added some src that includes non-paramterized functions.
QUESTION
I'm trying to create a sound using Fourier coefficients.
First of all please let me show how I got Fourier coefficients.
(1) I took a snapshot of a waveform from a microphone sound.
- Getting microphone: getUserMedia()
- Getting microphone sound: MediaStreamAudioSourceNode
- Getting waveform data: AnalyserNode.getByteTimeDomainData()
The data looks like the below: (I stringified Uint8Array, which is the return value of getByteTimeDomainData()
, and added length
property in order to change this object to Array later)
ANSWER
Answered 2022-Feb-04 at 23:39In golang I have taken an array ARR1 which represents a time series ( could be audio or in my case an image ) where each element of this time domain array is a floating point value which represents the height of the raw audio curve as it wobbles ... I then fed this floating point array into a FFT call which returned a new array ARR2 by definition in the frequency domain where each element of this array is a single complex number where both the real and the imaginary parts are floating points ... when I then fed this array into an inverse FFT call ( IFFT ) it gave back a floating point array ARR3 in the time domain ... to a first approximation ARR3 matched ARR1 ... needless to say if I then took ARR3 and fed it into a FFT call its output ARR4 would match ARR2 ... essentially you have this time_domain_array --> FFT call -> frequency_domain_array --> InverseFFT call -> time_domain_array ... rinse N repeat
I know Web Audio API has a FFT call ... do not know whether it has an IFFT api call however if no IFFT ( inverse FFT ) you can write your own such function here is how ... iterate across ARR2 and for each element calculate the magnitude of this frequency ( each element of ARR2 represents one frequency and in the literature you will see ARR2 referred to as the frequency bins which simply means each element of the array holds one complex number and as you iterate across the array each successive element represents a distinct frequency starting from element 0 to store frequency 0 and each subsequent array element will represent a frequency defined by adding incr_freq
to the frequency of the prior array element )
Each index of ARR2 represents a frequency where element 0 is the DC bias which is the zero offset bias of your input ARR1 curve if its centered about the zero crossing point this value is zero normally element 0 can be ignored ... the difference in frequency between each element of ARR2 is a constant frequency increment which can be calculated using
QUESTION
I'm getting data from using print command but in Pandas DataFrame throwing result as : Empty DataFrame,Columns: [],Index: [`]
Script: ...ANSWER
Answered 2021-Dec-22 at 05:15Use read_html for the DataFrame creation and then drop the na rows
QUESTION
So I was trying to convert my data's timestamps from Unix timestamps to a more readable date format. I created a simple Java program to do so and write to a .csv file, and that went smoothly. I tried using it for my model by one-hot encoding it into numbers and then turning everything into normalized data. However, after my attempt to one-hot encode (which I am not sure if it even worked), my normalization process using make_column_transformer failed.
...ANSWER
Answered 2021-Dec-09 at 20:59using OneHotEncoder is not the way to go here, it's better to extract the features from the column time as separate features like year, month, day, hour, minutes etc... and give these columns as input to your model.
QUESTION
I have 4D data in a data frame. I need to convert it to 3D Numpy array. I can do it with for-loops, but is there more efficient way?
...ANSWER
Answered 2021-Nov-24 at 16:22It seems like np.swapaxes
does the trick you need: arr.reshape(2,3,4,4).swapaxes(2,3).reshape(2,3,16)
The main idea is to swap the axes in the most inner data:
QUESTION
ANSWER
Answered 2021-Nov-18 at 00:03One option to achieve your desired result would be to use stat="bin"
in geom_text
too. Additionally we have to group
by year so that each year is a separate "block". The tricky part is to get the year labels for which I make use of after_stat
. However, as the group
s are stored internally as an integer sequence we have them back to the corresponding years for which I make use of a helper vector.
QUESTION
I am trying to get the cumulative proportion of a variable (Gender; sf_sex) across time (startday; Days).
My code is the following
...ANSWER
Answered 2021-Sep-30 at 08:21If I understood correctly
QUESTION
I find this interesting documentation, that shows how to make an svg file animated.
https://css-tricks.com/svg-line-animation-works/
However, I am having issue with making my project look like it is being completed when open.
I want my project to animate similar to section 8 of the above doc.. Help please
[newbie]
...ANSWER
Answered 2021-Aug-28 at 08:11Do you want something like this:
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