R-tutorials | A repo for R explainers and useful code

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R-tutorials is a HTML library. R-tutorials has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

A repo for R explainers and useful code

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It has 18 star(s) with 4 fork(s). There are 19 watchers for this library.

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Community Discussions

Trending Discussions on R-tutorials

How do i get byte[] pcmData of internal audio (Xt Audio for Java)

Using self in init part of a class in Python

Stream plot with varying colours in matplotlib giving 2 cmaps

How to colorize a part of code in a GitHub repository?

Is there an efficient way to bin the main colors from an RGB image?

Getting ’Cannot find config for target=opencl -device=intel_graphics -model=unknown, workload=' error` when trying official TVM tutorial

How to programmatically tell the matplotlib plot window to save and close

Fixed-error: How to Solve The return type 'StreamController' isn't a 'Stream', as defined by anonymous closure error

Plot histogram of Benford law

What are the two styles of matplotlib?

QUESTION

How do i get byte[] pcmData of internal audio (Xt Audio for Java)

Asked 2021-Feb-07 at 12:06

How do i get byte[] pcmData (just like in https://github.com/goxr3plus/Java-Spectrum-Analyser-Tutorials) but on xt audio? i wanted to draw the osc (spectrum analyzer) of the internal audio using wasapi (output speakers) of the computer real time. e.g. analyzes youtube audio output real time, internal audio of games, etc.

edit: how do i capture internal audio wasapi pcmdata (internal sound, not mic sound) using xt audio to analyze it on a visualizer? i need byte[]

...

ANSWER

Answered 2021-Feb-07 at 12:06

See below for a complete example. It records 1 second of audio data for each loopback device, converts it to a byte array, then dumps that to a file with the name of the device. I hope it's sufficiently self-explanatory.

Source https://stackoverflow.com/questions/66043778

QUESTION

Using self in init part of a class in Python

Asked 2021-Feb-06 at 13:48

Is there any difference between the following two codes related to initializing a class in Python?

...

ANSWER

Answered 2021-Feb-02 at 18:45

No. there is no difference between these two approaches in your case with this level of information. but could they? Yes. they could. if they have some modifications in their setters or getters. later in my answer I'll show you how.

First of all, I prefer using this one:

Source https://stackoverflow.com/questions/66012667

QUESTION

Stream plot with varying colours in matplotlib giving 2 cmaps

Asked 2020-Jun-17 at 18:26

A stream plot, or streamline plot, is used to display 2D vector fields. I am creating a stream plot with varying colors in Python but am getting two different cmap on the side. The code used is almost identical to the help file but I am getting multiple cmaps on the third plot. How does one remove the second cmap?

Below is the code that I used followed by the output.

...

ANSWER

Answered 2020-Jun-17 at 18:26

You should specify the ax of the ax2.streamplot:

Source https://stackoverflow.com/questions/62435757

QUESTION

How to colorize a part of code in a GitHub repository?

Asked 2020-Jun-11 at 07:09

How to make code selected on GitHub? For example, there is a part of the code selected with background color.

...

ANSWER

Answered 2020-Jun-11 at 07:09

In this URL:

Source https://stackoverflow.com/questions/62318761

QUESTION

Is there an efficient way to bin the main colors from an RGB image?

Asked 2020-May-17 at 06:49

I am working on a project where, loosely put, I'd like to extract the top n colors from an image along with a measure of the relative popularity of each. I started out using PIL and the getcolors() method but quickly ran into the problem of converting the (frequency, color) tuples getcolors() returns back to RGB values—or even to colors in a PIL palette. That said, the upshot of PIL is that it maps the RGB values to a single dimension.

...

ANSWER

Answered 2020-May-16 at 17:28

I happen to have pillow 6.2.1 if that matters.

Also the documentation for getcolors() points out that if the actual number of colors in the image exceeds the maxcolors parameter, then None is returned.

So, my own experiment goes like this:

Source https://stackoverflow.com/questions/61833435

QUESTION

Getting ’Cannot find config for target=opencl -device=intel_graphics -model=unknown, workload=' error` when trying official TVM tutorial

Asked 2020-Apr-09 at 07:05

I'm trying to run the first example in TVM, but at the very begining I'm faced with these errors. I have built the tvm with LLVM ON and OpenCL On (installed Intel sdk for opencl applications - opencl 2.1). The build process went smoothly without a hitch, so I guess everything is in place.

However I get these errors when I tried to run this snippet from this example: Quick Start Tutorial for Compiling Deep Learning Models :

...

ANSWER

Answered 2020-Apr-09 at 07:05

What you are seeing is not an error, but a warning. Because TVM could not find a log file which contains the optimized schedules, it will just use the default (fallback) schedules.

To get rid of the warning, you need to use AutoTVM (as in this example) to find the optimized schedules. After that, you can proceed to compiling.

Source https://stackoverflow.com/questions/60069102

QUESTION

How to programmatically tell the matplotlib plot window to save and close

Asked 2020-Jan-07 at 19:07

This snippet opens the plot window and it stays open until I click to close it. How do I tell Matplotlib to save the graphic and close the window?

...

ANSWER

Answered 2020-Jan-07 at 19:07

Just use plt.savefig instead of plt.show() if you want to save the figure instead of display it:

Source https://stackoverflow.com/questions/59634511

QUESTION

Fixed-error: How to Solve The return type 'StreamController' isn't a 'Stream', as defined by anonymous closure error

Asked 2020-Jan-05 at 11:14

I was following the below tutorial for connectivity status based on internet connection.

link : https://www.filledstacks.com/post/make-your-flutter-app-network-aware-using-provider-and-connectivity-status/

now the issue is, then i am trying to implement the code. at the end of the process where i am using StreamProvider, in builder i am getting this error of:

error: The return type 'StreamController' isn't a 'Stream', as defined by anonymous closure.

CODE IS AS FOLLOWED: main.dart

...

ANSWER

Answered 2019-Sep-20 at 16:35

Fix / answer to the problem updated in the first post ( question itself ). Thank you .

Source https://stackoverflow.com/questions/58013611

QUESTION

Plot histogram of Benford law

Asked 2019-Nov-20 at 10:32

I try to plot Benford's law

...

ANSWER

Answered 2019-Nov-20 at 10:32

You want to plot a bar plot, not a histogram. You can do that as following:

Source https://stackoverflow.com/questions/58952042

QUESTION

What are the two styles of matplotlib?

Asked 2019-Oct-03 at 15:41

I'm reading the documentation for matplotlib. Under the 'Coding Styles' section, it says:

When viewing this documentation and examples, you will find different coding styles and usage patterns.

Later...

Of the different styles, there are two that are officially supported. Therefore, these are the preferred ways to use matplotlib.

For the pyplot style...

But then in the rest of that section they never explicitly explain or mention the 'second' supported coding style. They say something about a 'MATLAB-style' but it is unclear from the context if that is referring to the pyplot style (as if it is like MATLAB) or if it is a separate style itself.

Question

What is the second supported matplotlib coding style and how does it relate / differ from the pyplot style?

...

ANSWER

Answered 2019-Oct-03 at 15:29

The next level down in the hierarchy is the first level of the object-oriented
interface, in which pyplot is used only for a few functions such as figure 
creation, and the user explicitly creates and keeps track of the figure and axes 
objects. At this level, the user uses pyplot to create figures, and through those 
figures, one or more axes objects can be created. These axes objects are then used 
for most plotting actions.

Source https://stackoverflow.com/questions/58222006

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