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I'd like to learn more information on %>% in R programming.
I have tried googling and researching the issue but have come up empty handed.
I have also searched overflorw but no information was found.
Any links or resources would be greatly appreciated
This is part of the magrittr package, where the link to the left provides an excellent introduction.
The %>% is beginning to be incorporated into other packages, although it can be used with any functions to pipe the output into the first argument input to a second function. The %>% operator can also be chained.
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Is there a R package for this? I´m looking for something similar to qrencoder but in 1D
For now, my walkaround solution is to use python-barcode through reticulate but I would like to use a R library.
library(reticulate)
barcode <- import("barcode")
name <- barcode$generate('EAN13', '7750243002455', output='barcode_svg')
My ultimate goal is to show barcodes of my products on a Shiny app
Have a look at the zintr package, which uses zint.
barcode_print(8675309, "barcode1.png")
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Im trying to build a database of historical performance of Bitcoin and a few other larger coins. To do this I want to extract the main table from this URL (with these particular dates) into r:
https://coinmarketcap.com/currencies/bitcoin/historical-data/?start=20130428&end=20170705
What would be the best package and method to do this in r?
Thanks
The rvest package is helpful here:
library(rvest)
url <-read_html("https://coinmarketcap.com/currencies/bitcoin/historical-data/?start=20130428&end=20170705")
table <- url %>%
html_table() %>%
as.data.frame()
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I know with using pack 'real', we can use embedded R in Prolog. But I met problems to use this pack. And I didn't find simple examples of using this pack.
Can somebody give a simple example of this pack?
e.g. Loading Prolog values on to R variables and then call R functions on these values (generate a plot by R function or whatever).
The syntax is the same as the SWISH version I think so just look here:
http://swish.swi-prolog.org/example/Rserve.swinb
and
http://swish.swi-prolog.org/example/Rdataframe.swinb
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I am going to generate a Run Chart in R. I need a package and example to show me how to do this. I found the "qicharts" package but apparently is has a problem to install.
what kind pf Problem do you have while installing "qicharts"? Do you get an error? I am asking because it is working for me.
Nevertheless you might also want to have a lock at the "qcc"-Package. Here you can find something like a small introduction and here is the cran help to the package.
But I also think that the chance is high that you can plot your with "ggplot2" too.
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Is there a package for approximating a function using Chebychev Polynomials?
I was formerly using Matlab and there was a package called Compecon that can approximate a function using Chebychev Polynomials.
I am wondering if there is any packages similar for Julia.
Or is there any packages in C or fortran or Python that can do this?
Thanka a lot!
You might want to check out ApproxFun.jl, it may be relevant.
https://github.com/QuantEcon/CompEcon.jl and related https://github.com/QuantEcon/BasisMatrices.jl have the capacity I believe.