Text Formatting ⇒ siunitx | Calculated Value in physical Quantities

[svend_tveskaeg]

Hi all.

Consider the following MWE:

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\documentclass{article}

\usepackage{siunitx}
\usepackage{auto-pst-pdf,pstricks-add}

\begin{document}

\begin{figure}
\def\minimum{0 }
\def\maximum{10 }
\def\difference{\maximum \minimum sub }
 \centering
  \begin{pspicture}(\maximum,\maximum)
   \pnode(!\minimum \minimum){A}
   \pnode(!\minimum \maximum){B}
   \pnode(!\maximum \maximum){C}
   \pnode(!\maximum \minimum){D}
   \pspolygon(A)(B)(C)(D)
   \psarc(!\maximum \minimum){!\difference}{90}{180}
   \psarc(!\minimum \maximum){!\difference}{270}{360}
  \psset{offset=12pt,nrot=:U}
   \pcline{|-|}(B)(C)
   \ncput*{\SI{\maximum}{\centi\meter}}
   \pcline{|-|}(C)(D)
   \ncput*{\SI{\maximum}{\centi\meter}}
  \end{pspicture}
\end{figure}

\end{document}

I would like to replace

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\pcline{|-|}(B)(C)
\ncput*{\SI{\maximum}{\centi\meter}}
\pcline{|-|}(C)(D)
\ncput*{\SI{\maximum}{\centi\meter}}

with something like

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\pcline{|-|}(B)(C)
\ncput*{\SI{\difference}{\centi\meter}}
\pcline{|-|}(C)(D)
\ncput*{\SI{\difference}{\centi\meter}}

but I am not allowed to do this.

If it is possible, how do I do this?

Thank you in advance!

[localghost]

You can't use postscript notation in the siunitx commands. The package does not understand this. You will need something else (untested).

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\SI{\numexpr\maximum-\minimum}{\cm}

Thorsten

[svend_tveskaeg]

I see!

When I apply your suggested code it compiles just fine but nothing is printed.

[cgnieder]

When I apply your suggested code it compiles just fine but nothing is printed.

Really? I get

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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!
! siunitx error: "invalid-number"
! 
! Invalid numerical input '\numexpr 10 -0 '.
! 
! See the siunitx documentation for further information.
! 
! For immediate help type H <return>.
!...............................................

But this works:

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\SI{\the\numexpr\maximum-\minimum}{\centi\meter}

or

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\def\difference{\the\numexpr\maximum-\minimum\relax}

and then

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\SI{\difference}{\centi\meter}

Regards

[svend_tveskaeg]

Really?

Yes. See the log file.

But this works:

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\SI{\the\numexpr\maximum-\minimum}{\centi\meter}

or

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\def\difference{\the\numexpr\maximum-\minimum\relax}

and then

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\SI{\difference}{\centi\meter}

Nice.

Thank you, Clemens.