[R-pkg-devel] Problems installing dependences of my package

And now, I have another problem because the versions are usually

forecast (>=8.7) but I need to use exactly the versi?n 8.7 because

they lost some functions. But if I use <= or == and the package is update

Hi,

I am writting because I am doing a package in R and I have some problems
installing dependences which appear at DESCRIPTION file.

First of all, I am not sure about the difference between Depends and
Imports, but I only use Depends.
My problem is that my package is going to be used at different computers
and for different persons so I want that when other person use my package,
it can be able to check  if the necesary packages are installed and if they
are not installed, the package must be able to install  them.
I supposed that this problem was solved including the necesary packages
and their versions at ?Depends?. And now, I have another problem because
the versions are usually indicated using ?>=?, for example: forecast
(>=8.7) but I need to use exactly the versi?n 8.7 because sometimes when
packages are updated, they lost some functions. But if I use <= or == and
the package is update to versi?n 8.8, my package installation fail.
How can I solve this? If I use R normaly (outside my package), I can
install older versions of other packages using devtools::install_version()
so why when I indicate  forecast (<=8.7) at Depends on the DESCRIPTION
file, R is not able to install an older version if a new one is avaliable?

Thanks in advance for your attention.

Best regards,

Andrea.


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