# Spanish numbers using LaTeX

Dear SageMath community,

I am currently writing a LaTeX document in Spanish that relies heavily on sageTeX for computations. The rules for writing numbers in Spanish are a little different from English ones. For example, we are prohibited from using commas to separate every 1000 factor, instead using a small space, only if the number is longer than four digits; otherwise, no sign should be used. On the other hand, the decimal point is actually a decimal comma. For example,

- 1,000,000.25 should be written as 1 000 000,25
- 123,456,789.123456789 should be written as 123 456 789,123 456 789
- 4,000 should be written as 4000

Using sageTeX, SageMath's `latex`

command, and LaTeX babel package, it is easy to replace the decimal point with a decimal comma. It is also easy to eliminate the commas for every 1000 factor. However, I haven't been able to put a small space instead.

I could use the `siunitx`

LaTeX package, which has a command, `\num`

, that does exactly this processing. However, it doesn't work with sageTeX's `\sage`

command or any of it's environments. The only solution I can find is to apply the `\num`

command directly to every number generated by SageMath via the `latex`

command.

My problem is: I don't know how to do this, specially in cases where numbers are entries of a matrix, or the coefficients of a polynomial. So, **how could I apply the \num command to every number independently using the latex command?**

Thanks in advance for your answers! Any alternative approach is also welcomed.

Thank you for pointing this Spanish rule. I was taught in school to use dots to separate every three digits. Apparently this has changed since http://lema.rae.es/dpd/srv/search?id=...