SYNOPSIS

gr [terminal_name] [character_set]

DESCRIPTION

C-PLOT needs to know the terminal in use and, when appropriate, the alternative character set, to draw PseudoGraphics plots and erase the screen. It normally obtains the terminal name from the environment exported by the shell, and you won't need to use this command. However, if the name from the environment is wrong or absent, you can use gr to set the terminal type from within the plot program. You also can use the gr command to select a PseudoGraphics character set independently of the terminal type.

The terminal_name option determines which control codes to send to the terminal to erase the screen and position the cursor for drawing PseudoGraphics. The character_set option determines which characters to use for drawing the PseudoGraphics axes and points. For some of the more common terminal types, the terminal name and character-set name are the same.

Without an argument, gr lists the names associated with each of the built-in PseudoGraphics character sets, prints the current terminal name and character-set name and prompts you for new names. You can keep the current names by entering <return>. Entering one name (or one argument after gr selects a new terminal type. If the name matches one of the character sets, that set is selected also. If you enter a second name (or argument), and it is a valid character-set name, that set is selected. An invalid name selects the dumb set.

Refer to Appendix A in the C-PLOT manual for details on PseudoGraphics implementation, including a list of valid character_set names. Valid terminal names are system dependent. They are usually in the file /etc/termcap. On System V installations, look in the subdirectories of /usr/lib/terminfo.

EXAMPLE

gr vt100 plot0