Hi all

I use Lyx v1.65 for creating LaTex.

Obviously it displays OK in Lyx. It also displays OK with an online editor I've tried
http://www.codecogs.com/latex/eqneditor.php

But invariably when I try to post LaTex to this forum it does not work. I've tried the sandbox which the reason for the error, but frankly speaking I don't have time to play around with LaTex code directly.

I wonder if anyone can suggest a good LaTex editor that is compatible with this forum.

FWIW, here's some LaTex created in Lyx which does not work here

\mathbf{\boldsymbol{\beta}^{\textrm{T}}A\boldsymbol{\beta}}&=\overset{n }{\underset{i=1}{\sum}}\overset{n}{\underset{j=1}{\sum}}\beta_{i}a_{ij} \beta_{j}

and

\frac{\partial(\mathbf{\mathbf{\beta}^{\textrm{T}}}\mathbf{A\boldsymbol {\beta}})}{\partial\beta_{k}}&=2\beta_{k}a_{kk}+2\overset{n}{\underset{ i\neq k}{\sum}}a_{ki}\beta_{i}

Thanks
LR
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 Mentor When you type 50 characters without a space, vBulletin will insert a space that usually breaks the code. Here you can see how it breaks the word "boldsymbol": $$\mathbf{\boldsymbol{\beta}^{\textrm{T}}A\boldsymbol{\beta}}&=\overset{n }{\underset{i=1}{\sum}}\overset{n}{\underset{j=1}{\sum}}\beta_{i}a_{ij} \beta_{j}$$ The workaround is to type a few extra spaces. That won't be enough in this case, unless you also put it in an align environment (because of the & symbol). \begin{align}\mathbf{\boldsymbol{\beta}^{\textrm{T}} A\boldsymbol{\beta}} &=\overset{n}{\underset{i=1}{\sum}} \overset{n}{\underset{j=1}{\sum}} \beta_{i}a_{ij}\beta_{j}\end{align}
 Hi Fredrik Thanks so much for the explanation ! So, just to be clear if I put begin{align} end{align} around the text from Lyx, it should solve the problem ? Thanks again LR

Mentor