[Solved] Vertical line in a formula

[ywguo]

How do I input a formula like the following.

y=f(x)|x=1.2

I cannot input that virtical line. That line need to scale with the expression of f(x) because f(x) is complicated sometimes. f(x) may occupy more than one line.

[RGB]

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left none y=f(x) mline x=1.2 right none

This will scale with your expression. You need to use the "left none" and "right none", otherwise you will see a red question mark instead of a vertical line...

[TheGurkha]

If this has answered your question, please go to your first post and add [Solved] to the start of the title. You can also use the green tick icon.

[firsttimelinux]

I was just about to post a related question, but during the typing of this post I managed to crack it (eventually): assuming this vertical line is for "evaluated at", then I wanted the value to be lower down, like in the lower limit of an integral. This is what I was trying to get:

left none {partial y} over {partial x} mline right none_{x_0}

After seeing left ( and left [ I assumed that left | and right | would work, but sadly not.

[Jintram]

Doesn't quite cut it, I used:

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left none {partial hat S(s mline r_0)} over {partial r_0} mline stack{{} # {}_{r_0=a}}  right none =hat R(S mline a) {hat f(r_0)}over{hat f(a)}

Any other ideas?

[ehawk]

This seems to work fairly well

for a single term:
left( mline {}_lower^upper right)

for expressions of the form a over b:
left( mline {binom{}{}}_lower^upper right)

for multiple stacked terms use
left( mline {stack{{} # {} #{}}}_lower^upper right)

I don't know why the left( and right) seem to be required, but they are.

[RGB]

for multiple stacked terms use
left( mline {stack{{} # {} #{}}}_lower^upper right)

I don't know why the left( and right) seem to be required, but they are.

The m in mline means "mid" so it goes in the middle of two brackets. You can use

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left none <?> mline <?> right none

if you don't need the ( ... )