New lists may be formed from existing objects by the function list(). An assignment of the form
St <- list( name
=object, name
=object, ...,name
=object )
sets up a list St of 
components using comp, ..., comp for the components and giving
them names as specified by the argument names, (which can be freely
chosen). If these names are omitted, the components are numbered only.
The components used to form the list are copied when forming the new
list and the originals are not affected.
Lists, like any subscripted object, can be extended by specifying additional components. For example
St[5] <- list(matrix=Mat)