Hi, Richard
thank you for your reply, I supposed to write R not Rstudio. anyway, I have tried to install an old version of R but still have the same issue for other packages, in which I found the packages that was not available for the newest version, but I can not install the packages that are only available for the newest version, I am new in R programming, please guide me through this problem, now I am using the R version 4.0.0, I wanted to install colorRamp2 package, this is what the warning showed: package ‘colorRamp2’ is not available (for R version 4.0.0)