Dear Andrew, thanks for the excellent idea. I will be a true believer and
user once it works smoothly.

Nevertheless, I have just tried a simple sum and the following error is
presented at compilation time:

! Undefined control sequence.

\clyx_vvlist_process:NN #1\clist_reverse:N

\l_tmpb_clist \clist_map_i...

l.25 \calculyx{$\sum_{n=1}^{2}n$}

No result of this sum is shown in the preview. Did I do something wrong?


Julio Rojas

On Mon, Nov 24, 2014 at 7:23 AM, Murat Yildizoglu <> wrote:

> Very nice and very cool indeed! Thanks a lot Andrew! This seems to be a
> nice (also because much lighter) competitor to the Sage module for many
> numerical computations.  I will check it as soon as I can.
> Best regards,
> Murat
>   aparsloe <>
>  24 novembre 2014 02:47
> I've written a LaTeX package called "calculyx" which numerically evaluates
> mathematical expressions in LyX "before one's eyes" using instant preview.
> It is written in the expl3 language of LaTeX3 but is used just like any
> other LaTeX package. There is a link at
> to a zipped archive currently in a
> Dropbox folder, and a screenshot (.png format) of a one-page LaTeX document
> and the resulting pdf with a few example calculations at
> The LaTeX may look complicated, but using LyX, all that is as ever hidden.
> One simply enters expressions in the LyX math editor as usual.
> Calculyx requires the three LaTeX3 bundles l3kernel,  l3packages and
> l3experimental. Because a main routine uses a  command that was introduced
> to l3kernel on 18 July 2014, the version of l3kernel must be later than
> this. The calculational engine for calculyx is the floating point module
> l3fp in l3kernel.
> I have tried to ensure as much as possible that calculyx reads expressions
> as mathematicians write them. For instance it will "digest" \sin 3x - 3\sin
> x + 4\sin^{3} x (for a specified value of x, say \pi/6) without parentheses
> around the arguments and with the superscript in the "wrong" but familiar
> place. It will "digest" the common arithmetic operators, plus variants like
> \times and \div, the familiar trigonometric and hyperbolic functions and
> their inverses, the exponential and natural logarithm, fractions (\frac,
> \tfrac), square root and \surd, factorials ( using !), binomial
> coefficients (\binom, \tbinom), \gcd, sums and products (\sum, \prod)
> including "infinite" sums and products, limits (\lim), derivatives (1st and
> 2nd order), including Cartesian 2-d and 3-d Laplacians, and definite
> integrals in one variable. Results are generally presented in the form:
> expression = result. There is also a (multi-column) table creating command
> and another which will iterate a function (for the chaos theorists).
> The package contains a novelty that I think could be exploited more
> widely. Some calculations are computationally intensive. So as not to
> burden the compilation of the pdf with them, these calculations can be
> "parked" either in a LyX note or in an inactive branch. Instant preview
> works in both places (with a caveat for LyX notes). The result of the
> calculation can be saved to a LaTeX control sequence. Calculyx
> automatically saves such control sequences to a file. They are then
> available for inserting elsewhere in the document -- even at the start,
> long before the place where the calculation is performed. If you are
> prepared to set up a converter and copier, then the file containing the
> control sequences can be saved in the document directory -- or copied to
> other directories whereby the results of those "parked" calculations are
> made available to these other documents. By this means selected items in
> LyX notes or inactive branches can play a part in compilation to pdf.
> Andrew
> --
> Prof. Murat Yildizoglu
> Université de Bordeaux
> GREThA (UMR CNRS 5113)
> Avenue LĂ©on Duguit
> 33608 Pessac cedex
> France
> Bureau : E-331
> Mail:
> Web:
>  <>

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