why this method does not working? 'set gxout shaded' 'define a=tmp2m' 'd a(t='i') - a(t='i-1')' report: constant field. value = 0 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://gradsusr.org/pipermail/gradsusr/attachments/20210508/5e405db7/attachment.html>