All of these functions are collected in a program package called "tubular". Therefore, prior to using any of those, please type the command "with(tubular)".
For more information on a particular function see <function>.
Some data are made available by means of global variables rather than via functions. See
tubular/globalvars for further explaination.
The general philosophy of the tubular program package is to set up an environment depending mainly on the chosen weight-sequence. Therefore, ahead of invoking any specific calculation, a
will have to be entered using the procedure read_in. A chosen weight sequence remains in force until another weight-sequence has been entered (invoking read_in again). In particular, only one weight sequence can be valid at a time.