Register to reply

How I can use a vertical bar to represent evaluation in LaTeX

by Kreizhn
Tags: evaluation, latex, represent, vertical
Share this thread:
Apr16-08, 06:58 PM
P: 743
Hey guys. This might not be the right place for this, but any ideas on how I can use a vertical bar to represent evaluation in LaTeX?


[tex] \displaystyle \frac{d}{dt} |_{t=0} f(t) [/tex]

I would like the vertical bar to be the size of the differential. I've tried using \left|, \right|, \vert, etc. but nothing seems to work. Thanks a lot in advance.
Phys.Org News Partner Science news on
Scientists discover RNA modifications in some unexpected places
Scientists discover tropical tree microbiome in Panama
'Squid skin' metamaterials project yields vivid color display
Apr16-08, 08:50 PM
HW Helper
P: 2,249
Hi Kreizhn,

Is this it?

[tex]\left. \frac{d}{dt} \right|_{t=0} f(t)[/tex]

which is given by

\left. \frac{d}{dt} \right|_{t=0} f(t)

Using either \left or \right on a period means the automatic delimiter sizing takes place, but only one delimiter is shown.
Apr16-08, 08:56 PM
P: 743
Excellent, thank you

Apr16-08, 11:32 PM
Sci Advisor
HW Helper
PF Gold
robphy's Avatar
P: 4,139
How I can use a vertical bar to represent evaluation in LaTeX

\frac{d}{dt} \bigg|_{t=0} f(t) achieves a similar effect
with manual sizing (by using two g's) and the unneeded \left. tag.

[tex]\frac{d}{dt} \bigg|_{t=0} f(t)[/tex]
May5-11, 12:35 PM
P: 17
I'm using lyx and I'm having difficulty trying to find the code for this vertical line. Any suggestions? I use the | but it's extremely small.
May5-11, 12:42 PM
P: 743
Maybe try \|?

The height of the vertical line will be determined by the {stuff} in between the \left. {stuff} \right|. If it's not naturally big, you may want to add an "invisible tower." My invisible tower is called \xstrut, and is defined as follows

\newlength{\myVSpace}% the height of the box
\setlength{\myVSpace}{3ex}% the default,
\newcommand\xstrut{\raisebox{-.5\myVSpace}% symmetric behaviour,
To change the height of the box, change

\setlength{\myVSpace}{Your number here}
Feb19-12, 12:15 AM
P: 23
\mathbf{M \bigg|_{x^k} \Delta x^k = -f(x^k)}
\mathbf{M \bigg|_{x^k} \Delta x^k = -f(x^k)}[/tex]

Register to reply

Related Discussions
Install MikTex first before you install texmaker or texniccenter Math & Science Software 4
Official LaTeX project website difficult Math & Science Software 6
I downloaded latex typer and installed it fine Math & Science Software 2
LaTex General Discussion 1