kang-yu / visa

Vegetation Imaging Spectroscopy Analysis (VISA)

visa

This R package is to facilitate Vegetation Imaging Spectroscopy Analysis (VISA). For more details of this package, you can browseVignettes("visa").

Installation

install the released version from CRAN:

The very first version of visa (0.1.0) is now on CRAN.

install.packages("visa")

You might encounter problem of package dependencies, such as some functions depend on ggplot2, ggpmisc. In such cases, you would have to install the all the dependencies.

install the dev-version from GitHub:

if (!require("devtools")) install.packages("devtools")
# devtools::install_github("kang-yu/visa") # install without vignettes
devtools::install_github("kang-yu/visa", build_opts = c("--no-resave-data", "--no-manual"))

You might encounter this problem of install_github(), and in this case, you could try update the {remotes} devtools::install_github("r-lib/remotes").

Usage

library(visa)
data(NSpec.DF)
x <- NSpec.DF$N # nitrogen
S <- NSpec.DF$spectra[, seq(1, ncol(NSpec.DF$spectra), 10)] # resampled to 10 nm steps
cm.nsr(S, x, cm.plot = TRUE)

Bug report

You can report your issues of using visa here. Don't know how to report a bug? Check RStudio's Instructions on Writing Good Bug Reports.

You might find useful information by checking the issues reported by others.

visa's Issues

Error: Failed to install: HTTP error 401. Bad credentials

Using github PAT from envvar GITHUB_PAT
Error: Failed to install 'visa' from GitHub:
HTTP error 401.
Bad credentials

Rate limit remaining: 55/60
Rate limit reset at: 2021-04-16 19:32:43 UTC

Installation failed: Does not appear to be an R package (no DESCRIPTION)

Installation via the github devtools::install_github("kang-yu/visa") might fail:
tar.exe: Archive entry has empty or unreadable filename ... skipping.
tar.exe: Archive entry has empty or unreadable filename ... skipping.
...
Installation failed: Does not appear to be an R package (no DESCRIPTION)
...
To solve the issue do the settings: Sys.setenv("TAR" = "internal")
The similar problem has been described here r-lib/devtools#1939