How can I pass a negative number into a macro as a parameter?

Question

When I run this macro definition using positional token definitions I can't seem to pass a negative number into it: *****************. set mprint=on. data list free/ time. begin data. 0 1 2 end data. define vars4 (!pos !tok(1)/!pos !tok(1)/!pos !tok(1)/!pos !tok(1)). compute int=!1. compute bt=!2. compute bbde=!3. compute btxbde=!4. !enddefine. vars4 96 -.76 -5.4 1.9. **************************. I get this as a result: vars4 96 -.76 -5.4 1.9. 28 0 M> 29 0 M> . 30 0 M> compute int= 96. 31 0 M> compute bt= -. >Error # 4007 in column 1024. Text: (End of Command) >The expression is incomplete. Check for missing operands, invalid operators, >unmatched parentheses or excessive string length. >This command not executed. 32 0 M> compute bbde= .76. 33 0 M> compute btxbde= - 34 0 M> 5.4 1.9. >Error # 4010 in column 5. Text: 1.9 >The expression contained two operands not separated by an operator. Check the >expression for omitted or extra operands, operators, and parentheses. >This command not executed. What can I do?