downsample | several downsampling methods for time series | Time Series Database library

 by   janjakubnanista TypeScript Version: 1.4.0 License: MIT

kandi X-RAY | downsample Summary

kandi X-RAY | downsample Summary

downsample is a TypeScript library typically used in Database, Time Series Database, Prometheus, Grafana applications. downsample has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Downsampling methods for time series visualisation. downsample is useful when, not extremely surprisingly, you need to downsample a numeric time series before visualizing it without losing the visual characteristics of the data.
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            kandi-support Support

              downsample has a low active ecosystem.
              It has 35 star(s) with 4 fork(s). There are 3 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 2 open issues and 2 have been closed. On average issues are closed in 330 days. There are 9 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of downsample is 1.4.0

            kandi-Quality Quality

              downsample has 0 bugs and 0 code smells.

            kandi-Security Security

              downsample has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              downsample code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              downsample is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              downsample releases are not available. You will need to build from source code and install.
              Installation instructions, examples and code snippets are available.

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            downsample Key Features

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            downsample Examples and Code Snippets

            No Code Snippets are available at this moment for downsample.

            Community Discussions

            QUESTION

            InfluxDB v2.1 - Task executed but nothing wrote in destination bucket
            Asked 2022-Mar-29 at 06:11

            I'm working with InfluxDB v2.1.

            I have this task:

            ...

            ANSWER

            Answered 2022-Mar-28 at 09:53

            Sometimes InfluxDB fails to write but doesn't respond with an error. In those cases, success status doesn't mean that the data was written. It means that data was accepted for writing but it might fail later. Try checking the _monitoring bucket. That bucket stores rejected data points with the error message.

            For example, in my case, it was a schema mismatch. One type was expected but another was received. I was using implicit schema which means that schema was decided by the InfluxDB itself based on the data I put there. I resolved this by making schema explicit. In this case, InfluxDB returns an error right away at the moment of writing.

            Source https://stackoverflow.com/questions/71608391

            QUESTION

            R Loop to store repeated results of t.tests in data frame
            Asked 2022-Mar-28 at 23:04

            I have no loop experience and need a loop to:

            • downsample a data frame
            • do a t test and store the results
            • extract the confidence limits
            • add confidence limits to a data frame
            • and redo say 100 times and append each iteration to the list. Below is the code for one iteration. I would like a data frame with 100 rows and 2 columns i.e. the upper and lower limits
            ...

            ANSWER

            Answered 2022-Mar-28 at 23:04

            You can use lapply(), and then use do.call(rbind,...) to a matrix, set to data.frame, and rename columns:

            Source https://stackoverflow.com/questions/71654454

            QUESTION

            Identify first occurence in dataframe in R and subsequently label every third row
            Asked 2022-Feb-23 at 15:22

            I have a large dataframe which I would like to downsample from 120hz to 40hz. It's not consistent enough though that I could just take every third row from the dataframe.

            I have something like the following dataframe:

            ...

            ANSWER

            Answered 2022-Feb-23 at 15:09

            Are you looking for this?

            Source https://stackoverflow.com/questions/71239059

            QUESTION

            Downsampling Velocity Information in a Quiver Plot
            Asked 2022-Feb-23 at 10:59

            I have two arrays (vel_y,vel_z) representing velocities in the y and z directions, respectively, that are both shaped as (512,512) that I am attempting to represent using a quiver plot. Here is how I plotted the quiver:

            ...

            ANSWER

            Answered 2022-Feb-23 at 10:59

            The simple way to do this is simply to take one point over N in each vectors given to quiver.

            For a given np.array, you can do this using the following syntax: a[::N]. If you have multiple dimensions, repeat this in each dimension (you can give different slip for each dimension): a[::N1, ::N2].

            In your case:

            Source https://stackoverflow.com/questions/71229858

            QUESTION

            Keras 1D segmentation model always classifies even number of items
            Asked 2022-Feb-03 at 09:11

            I'm trying to train a 1D CNN to identify specific parts of a text string.

            The inputs are arrays of shape (128,1) containing 128 characters, and the aim is for the network to classify each of the characters into a particular class. For purposes of illustration, an input array could look like this:

            ...

            ANSWER

            Answered 2022-Feb-02 at 22:48

            I think when you use UpSampling1D each value is repeated twice. Which means the input to the last step contains pair-wise duplicated value. It would then give the same predicted class for adjancent characters. If my guess is correct, you would always see the same prediction for the 2k and 2k+1 characters.

            You could confirm by inspecting the input x in

            Source https://stackoverflow.com/questions/70893269

            QUESTION

            Swift, array, image processing. Is using array.map() the fastest way to process all data in an array?
            Asked 2022-Jan-26 at 20:03

            I have an array with many millions of elements (7201 x 7201 data points) where I am converting the data to a greyscale image.

            ...

            ANSWER

            Answered 2022-Jan-26 at 17:25

            This is not a complete answer to your question, but I think it should give you a start on where to go. vDSP is part of Accelerate, and it's built to speed up mathematical operations on arrays. This code uses multiple steps, so probably could be more optimised, and it's not taking any other filters than linear into account, but I don't have enough knowledge to make the steps more effective. However, on my machine, vDSP is 4x faster than map for the following processing:

            Source https://stackoverflow.com/questions/70864092

            QUESTION

            how can we resample time series in polars
            Asked 2021-Dec-21 at 00:27

            I'd like to use the bucket expression with groupby, to downsample on monthly basis, as the downsampling function will be deprecated. Is there a easy way to do this, datetime.timedelta only works on days and lower.

            ...

            ANSWER

            Answered 2021-Dec-14 at 21:55

            I found a solutuion for my problem using the round expression and a groupby operation on the date column after it.

            Here is some Code exmaple:

            Source https://stackoverflow.com/questions/70327284

            QUESTION

            Coarsen xarray DataArray with weighted mean
            Asked 2021-Dec-15 at 00:16

            Let's say I have some DataArray:

            ...

            ANSWER

            Answered 2021-Dec-15 at 00:16

            One way to do this is through DataArrayCoarsen.construct, which allows you to more easily operate on individual windows at a time:

            Source https://stackoverflow.com/questions/70340835

            QUESTION

            Numpy (or scipy) binning of time series values based on timestamps
            Asked 2021-Nov-05 at 22:28

            I'm trying to bin (downsample) a time series based on its timestamps. For instance:

            ...

            ANSWER

            Answered 2021-Nov-05 at 22:28

            As mentioned in the comments, if your primary concern for not using Pandas is speed, I'd actually recommend using it, because it's not written entirely in Python, but it has many internal portions written using Cython (basically C), so they're very, very fast.

            Source https://stackoverflow.com/questions/69859761

            QUESTION

            2D alpha shape / concave hull problem in Python
            Asked 2021-Sep-15 at 04:05

            I have a large set of 2D points that I've downsampled into a 44x2 numpy array (array defined later). I am trying to find the bounding shape of those points which are effectively a concave hull. In the 2nd image I've manually marked an approximate bounding shape that I am hoping to get.

            I have tried using alphashape and the Delauney triangulation method from here, both methods providing the same answer.

            Unfortunately, I don't seem to be able to achieve what I need, regardless of the alpha parameters. I've tried some manual settings and alphaoptimize, some examples of which are below.

            Is there something critical I'm misunderstanding about alphashape? The documentation seems very clear, but obviously I'm missing something.

            ...

            ANSWER

            Answered 2021-Sep-15 at 04:05

            The plots that you attached are misleading, since the scales on the x-axis and the y-axis are very different. If you set both axes to the same scale, you obtain the following plot:

            .

            Since differences between x-coordinates of points are on the average much larger than differences between y-coordinates, you cannot obtain an alpha shape resembling your desired result. For larger values of alpha points scattered along the x-axis will not be connected by edges, since alpha shape will use circles too small to connect these points. For values of alpha small enough that these points get connected you will obtain the long edges on the right-hand side of the plot.

            You can fix this issue by rescaling y-coordinates of all points, effectively stretching the plot in the vertical direction. For example, multiplying y-coordinates by 7 and setting alpha = 0.4 gives the following picture:

            Source https://stackoverflow.com/questions/69186179

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install downsample

            downsample is an NPM module. You can easily download it by typing something like the following in your project:.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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            Install
          • npm

            npm i downsample

          • CLONE
          • HTTPS

            https://github.com/janjakubnanista/downsample.git

          • CLI

            gh repo clone janjakubnanista/downsample

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            git@github.com:janjakubnanista/downsample.git

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