I am new to Weave.jl and I am having trouble with the latex rendering. I have xelatex installed and can get it to render for simple latex equation, but when I try to use it for expressions that start with \begin{align} I get the following error (I shortened it):
julia> weave("MyNotebook.ipynb", doctype="md2pdf")
! Package amsmath Error: \begin{align} allowed only in paragraph mode.
See the amsmath package documentation for explanation.
Below is a simple example. Cells 1-3 render fine, but it errors on cells 4-5 (cell 5 is what cell 4 returns so they are the same)
I tried looking into ams math docs and didn’t really see anything about paragraph mode. Anyone have any ideas?
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Could you share the full weave file @co1emi11er if you are able to? I tend to work with Weave quite a lot so curious what is blowing up.
Not totally sure if this works for string macros, but can you try triple-quoting the latex string? Eg
L"""
Equation here
"""
For regular strings, triple quotes are typically used for block text
I tried it, but it still doesn’t work like that either…
It was a good idea though. I didn’t think to try that!
What you see there is what is in the file. I was just testing out my package to see if I could use weave with it.
Here is the text if you just want to copy paste:
using Handcalcs
using Latexify, LaTeXStrings
a = 3
b = 4;
latexify("x = 2")
@handcalcs c = sqrt(a^2 + b^2)
L"
\begin{align}
c &= \sqrt{a^{2} + b^{2}} = \sqrt{3^{2} + 4^{2}} = 5.0
\end{align}"
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I could reverse engineer your error message to Help with amsmath: align not possible?
so the error comes from that it is currently set as $\begin{align}...\end{align}$
From the MWE I am not sure what you want to align in one line of math, but I assume your application has more of that?
I was a bit lazy and did not install Weave but used your small code example. As far as I can see LaTeXStrings by default encapsulates the latex string in $...$
julia> s = L"
\begin{align}
c &= \sqrt{a^{2} + b^{2}} = \sqrt{3^{2} + 4^{2}} = 5.0
\end{align}"
L"$
\begin{align}
c &= \sqrt{a^{2} + b^{2}} = \sqrt{3^{2} + 4^{2}} = 5.0
\end{align}$"
With latexify you can choose what to add, but then you have to define it as a “normal” string before and do latexify(my_string; env=:eq). then the align is in an equation, which is what resolves the problem for example.
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Hey @co1emi11er , I tried my hand at making a Weave document that uses handcalcs and doesn’t blow up. As @kellertuer said, there’s a bit of a problem with what Handcalcs is doing with generating a LaTeXString to embed into a weave document. Here is a pretty “dumb fix” to make a weave document (julia markdown document) render as expected:
```julia
using Handcalcs
using Latexify, LaTeXStrings
```
```julia
a = 3
b = 4;
```
```julia
latexify("x = 2")
```
```julia
my_tex = @handcalcs c = sqrt(a^2 + b^2)
my_tex = replace(my_tex.s, "\$" => "")
my_tex = convert(LaTeXString, my_tex)
```
`j my_tex`
And here is how it renders as a PDF:
I’d have to tinker a bit more with notebook rendering but I hope that helps somewhat as a starting point and maybe for thinking around how to address this problem more elegantly…
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Thanks @kellertuer and @TheCedarPrince! Now that I know where the issue lies, I’m sure I can figure out a way to get it rendering!
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Okay I got it working now. It was a pretty simple fix!
Now one more question…
It is now rendering in the middle of the page. I would like these cells to be left aligned. Is there a way to do that?
Thanks for the help! I don’t know if I would have figured that out without you both.
2 Likes
Interesting! May I have a copy of the Weave file and the version of Handcalcs.jl you are using?
I’ll try tinkering with something @co1emi11er ! 
1 Like
Yes!
I have updated repo of Handcalcs.jl.
Here is the weave example: weave example
Well, align is an offset equation, so that ia usually entered. there is an option flaglign for ams math, but I am not sure how to tell that your MathJax/KaTeX (web-based) LaTeX engine.
But according to environments - How can I write multi line equations with alignment in inline math mode? - TeX - LaTeX Stack Exchange an answer could be to use aligned instead of align? Then even the $s work again 
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