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Other way around it:

During MiKTeX installation choose option installing missing packages on-the-fly=NO. This prevents problem from happening.

Compiled it shows different behaviour pattern for \nanosecond and \ns. It seems like I can re-define existing units and have to create new ones only. Is this correct?

If you look at Klemens example it does not work. Unit only definitions are not applied in the document in comparison to general command using \sisetup.

I think that way around it would be

\newcommand*{\FlexUnits}[2]{\SI[scientific-notation=engineering,prefixes-as-symbols=false]{#1}{#2}}

but is ...

Is there any more news on this one? Does it mean that unit specific definition cannot be made?

Joseph,
I am using Lyx as my front end but I dont think this make any difference. Testing following code


\documentclass[oneside,british,oldfontcommands]{memoir}
\usepackage{babel}
\OnehalfSpacing
\makeatletter
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands.
\sisetup{per-mode ...

Joseph,
It does not seems to work - unit wise settigns settings seems to be completely ignored.
I attach used code, could I be doing something wrong here?

\usepackage{siunitx} %this is for units display
\sisetup{per-mode=fraction, tight-spacing = true , fraction-function = \tfrac , quotient-mode ...

I see.
I meantime, is it possible to globaly change display pattern for specific units? Currently I set it up in preamble.

Usage for this setting was intended for the seconds as I prefer it to ns,ms,us ect. But this is not so useful when I deal with distances, areas and weights. If I could restrict ...

If its possible this would be great. If not, I will have to stop using prefixes conversion.

Thank you,

I really suspect that this can be done. Can anybody point me proper direction?

With following settings
\sisetup{input-product=x , output-quotient = \ensuremath { { } \times{}}}
\sisetup{scientific-notation = engineering, prefixes-as-symbols=false}
this code
\SI{1.2x0.8}{\km}
will produce 1.2*10^3m x 800*10^-3*10^3m. Is there any option to force siunitx to recognise that 10 ...