For the second problem, it renders with:

 t=text("%s" %LatexExpr(table(ls,header_row=('n','partial sum'))) 
,(2,-1),color='black')

El miércoles, 22 de noviembre de 2017, 17:10:43 (UTC+1), Andy Howell 
escribió:
>
> I have two problems rendering latex. The first is in a plot title. The 
> fraction should be centered. 
>
> If I try the same latex: 
>
> \sum_{n=1}^{\infty}\frac{12}{(-5)^n} 
>
> at http://www.codecogs.com/latex/eqneditor.php 
>
> it renders as I expect. 
>
> The second problem is rendering latex for a table. I thought I could do 
> something like this: 
>
> t=text("$%s$" %latex(table(ls,header_row=('n','partial sum'))) ,(2,-1), 
>
> I have tried with and without the enclosing $, with it \$, \\$. It 
> always shows the unrendered latex. 
>
> I've tried this in 8.0 and 8.1rc2. Both in the notebook, and from the 
> command line. The code for the plot is is bellow. 
>
>
> def an(n): 
>     return 12/(-5)^n 
>
> def sn(n): 
>     return sum([an(n) for n in range(1,n+1)]) 
>
> ls=[(n,RR(sn(n))) for n in range(1,11)] 
> la=[(n,RR(an(n))) for n in range(1,11)] 
> t=text("$%s$" %latex(table(ls,header_row=('n','partial sum'))) ,(2,-1), 
> color='black') 
> s=list_plot(ls, title="8.2-3 $\\sum_{n=1}^{\\infty}\\frac{12}{(-5)^n}$", 
> title_pos=(0.5,1.2)) 
> a=list_plot(la) 
> show(t+s+a) 
>
> Thanks, 
>
> Andy 
>

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