arning in install.packages : package ‘affy’ is not available (for R version 3.6.1)

This error message means that the affy package is not currently available for the version of R that you are running (3.6.1).

There are a few possible solutions you can try:

1. Update R to a more recent version. The affy package may be available for a newer version of R. You can download the latest version of R from the CRAN website (https://cran.r-project.org/).

2. Check if the package is available on Bioconductor. The affy package is part of the Bioconductor project, which provides a collection of R packages for analyzing and visualizing biological data. You can try installing the package using the following command:

if (!requireNamespace("BiocManager", quietly = TRUE))
    install.packages("BiocManager")
BiocManager::install("affy")

3. If all else fails, you can try installing an older version of the package that is compatible with your version of R. You can find older versions of the package on the Bioconductor website (https://bioconductor.org/packages/release/bioc/html/affy.html).