At 10:39 18/01/2008 -0700, Scott Pendley wrote:
I am probably missing something very simple here but I am posting my
question because I can't seem to find the answer in the tutorials I
have read. I am trying to equation for a derivative.
{dV(x)} over {dx} line rsub {x^*}
the term "line rsub {x^*}" is the mathematical representation of
evaluating the earlier derivative where x = x*. I am just looking
for the key work for creating a vertical line. Looking through the
tutorial I see the keywords lline, rline, mline. However, none of
them seem to really apply.
There are a number of issues here, I think.
o The easiest way to create a single vertical line on the right is
to use the "single vertical bars" - lline and rline - but then to
suppress the left one. To do this, you put "left none" before and
"right rline" after your object.
o Because the asterisk is itself an operator, you cannot use it
nakedly as a superscript item. So you need to put it into quotation
marks to achieve what you need: x^"*". (In fact, since the asterisk
is naturally somewhat raised, you may not want it superscripted at all.)
o This might be enough for you, but I think the x* you get using
rsub is too small - not only being subscripted but also reduced in
size. You might prefer to have your value positioned lower but not
reduced in size - and there is room for this, of course. You can do
this using the two-element "vertical stack" facility - binom - and
just making the upper element blank.
Try this:
left none {dV(x)} over {dx} right rline binom " " x^"*"
or (I think better):
left none {dV(x)} over {dx} right rline binom " " {x"*"}
I trust this helps.
Brian Barker
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