Dear Ambili,

Do you mean you have some data and you need to transform the data using ilr-transformation? If so please read the following post, please

https://stats.stackexchange.com/questions/244118/how-to-use-isometric-logratio-ilr-from-a-package-compositions

You need to install the package "comopisitons" in R software.

You may find the following link helpful for more info regarding

ilr-transformation.

https://stats.stackexchange.com/questions/259208/how-to-perform-isometric-log-ratio-transformation

I welcome any questions you may have.

Good luck,

Hamid