Hi Folks, I have just stumbled on a nasty little trap. Do not use auto-incrementing number registers in tables!!
Example (two versions): A: .nr EQno 0 1 .LP \n+[EQno] \n+[EQno] Output: 1 2 =================== B: .nr EQno 0 1 .LP .TS tab(#); l l. \n+[EQno]#\n+[EQno] .TE Output: 3 4 =================== Reason: In the output of tbl, one finds lines like: .nr 3w0 \n[3w0]>?\w\[tbl]\n+[EQno]\[tbl] .nr 3w1 \n[3w1]>?\w\[tbl]\n+[EQno]\[tbl] ... \&\h'|\n[3cl0]u'\n+[EQno]\h'|\n[3cl1]u'\n+[EQno] The first two lines calculate some widths -- and at the same time increment the register \n[EQno], first to 1, then to 2; and then the third line (which does the printing) increments it to 3 and then to 4! Background: For layout reasons, I wanted to put some numbered equations into a table, with auto-incrementing equation numbers, on the lines of .TS tab(#); l l l. What it's about#$the equation$#\n+[EQno] ...(more of the same) .TE ... with the results described above! I don't see any way of working round this, given the way 'tbl' works, except to use customised fixed-value registers in this type of context. For example: .nr tblEQno1 \n+[EQno] .nr tblEQno2 \n+[EQno] .nr tblEQno3 \n+[EQno] .TS tab(#); l l l. About 1#$eqn 1$#\n[tblEQno1] About 2#$eqn 2$#\n[tblEQno2] About 3#$eqn 3$#\n[tblEQno3] .TE Then \n[EQno] has been auto-incremented (in the background) by 3, ready for its next normal (not-in-table) invocation. Comments welcome! Best wishes to all, Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <[EMAIL PROTECTED]> Fax-to-email: +44 (0)870 094 0861 Date: 19-Feb-08 Time: 13:44:47 ------------------------------ XFMail ------------------------------
