LaTex broken in 2nd and subsequent previews

[grmcdorman]

Easiest way to reproduce:

• Go to the LaTex thread in this forum.
• Hit 'Quote' on the last post.
• Hit 'Preview'
• Hit 'Preview' on the preview page

Expected result: Preview still shows LaTex.
Observed result: Preview shows raw jstex.

[LunarOrbit]

Copied for testing...


OK, looking up the LaTex, I can do Heiwa's equations in a more readable form. This gives another way of looking at the problem.

So, given:

mi	Initial mass
vi	Initial velocity
mf	Final mass
vf	Final velocity
e	Energy (J) available from fuel combustion

[jstex]\frac{1}{2}m_i v_i^2 - \frac{1}{2}m_f v_f^2 = e[/jstex]

Equ. 1

So, solving for v_f:

[jstex]\frac{1}{2}m_f v_f^2 = \frac{1}{2}m_i v_i^2 - e[/jstex]
[jstex]v_f^2 = \frac{2 ( 1/2 m_i v_i^2 - e ) }{m_f}[/jstex]
[jstex]v_f = \sqrt{ \frac{m_i v_i^2 - 2e}{m_f} }[/jstex]	Equ.2

Heiwa, do you:

• Agree that this is correct?
• Agree that using Equ. 2, we can calculate the spacecraft's final velocity, given the initial velocity and mass, the final mass, and the energy from the burned fuel?

[LunarOrbit]

Copied for testing...


OK, looking up the LaTex, I can do Heiwa's equations in a more readable form. This gives another way of looking at the problem.

So, given:

mi	Initial mass
vi	Initial velocity
mf	Final mass
vf	Final velocity
e	Energy (J) available from fuel combustion

[jstex]\frac{1}{2}m_i v_i^2 - \frac{1}{2}m_f v_f^2 = e[/jstex]

Equ. 1

So, solving for v_f:

[jstex]\frac{1}{2}m_f v_f^2 = \frac{1}{2}m_i v_i^2 - e[/jstex]
[jstex]v_f^2 = \frac{2 ( 1/2 m_i v_i^2 - e ) }{m_f}[/jstex]
[jstex]v_f = \sqrt{ \frac{m_i v_i^2 - 2e}{m_f} }[/jstex]	Equ.2

Heiwa, do you:

• Agree that this is correct?
• Agree that using Equ. 2, we can calculate the spacecraft's final velocity, given the initial velocity and mass, the final mass, and the energy from the burned fuel?

[LunarOrbit]

Observed result: Preview shows raw jstex.

I see what you mean. Fortunately it still posts as LaTex if you submit it. I'm not sure if I can fix it myself, I'll have to wait for an update from the plugin developer.

[grmcdorman]

FYI, it isn't exclusive to the quote function; it's the preview on the preview page (i.e. press Preview below Quick Reply, then Preview on the subsequent page). The steps I gave were what seemed to be the simplest to reproduce the issue - which is always important with bugs (and other things <grin>).