f_substr.ihlp

是一个经济学管理应用软件 很难找的 但是经济学学生又必须用到

{* 30nov2004}{...}
{phang}
{cmd:substr(}{it:s}{cmd:,}{it:n1}{cmd:,}{it:n2}{cmd:)} returns the
	substring of {it:s} starting at {it:n1} for a length of {it:n2}.  If
	{it:n1}<0, the starting position is interpreted as distance from the
	end of the string.  If {it:n2} is {it:missing} ({hi:.}),
	the remaining portion of the string is returned.{p_end}