For devel languages R released openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:flyos:R-packages/devel_languages_R_released_openSUSE_Tumbleweed/home:flyos:R-packages.repo
zypper refresh
zypper install rstudio
For devel languages R released openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:flyos:R-packages/devel_languages_R_released_openSUSE_Factory/home:flyos:R-packages.repo
zypper refresh
zypper install rstudio