THE DISPOSITION MENU THE DISPOSITION MENU

At the conclusion of many commands, the user is placed into the "Disposition Menu". In this menu, data may be processed and written to either an output file, a post-processing file, the terminal, a graphics device, or to a global variable.

When dealing with data in the Disposition Menu, it is best to think of it as being a matrix. The columns of the matrix are called variables and the rows are called records. Each variable is identified by its column number or name , and one can obtain a list of the names of the variables and their column numbers by issuing the command,


     VLIST.

Throughout this menu, one selects columns with column selectors. These selectors can be a single number, a colon separated pair of numbers, or a name selector; e.g. 5, 7:8, @x:@. The colon pair selects all columns from the first number to the second one. In many cases, only a limited number of columns can be selected. In this case, the first one selected will be used. For example, suppose that you can select six values and you use 1:12 for the column selector, then only 1:6 will be used.

Sometimes, one may wish to alter the values of the data available. This can be accomplished by using either of the commands:


     C_SCALE, SCALE_F, CS(1),  CS(2), ...

     C_SHIFT, SHIRT_F, CS(1),  CS(2), ...

The C_SCALE command defines a multiplier by which a variable will be scaled, and the C_SHIFT defines a constant which will be added to the variable. Once of these factors are established, they will stay in effect until it is changed with a new C_SCALE or C_SHIFT command, or until the Disposition Menu is exited.