General ⇒ readarray + siunitx and macro expansion fails

[gallioleo]

Hello Latex Community,

i try to read values from a csv file and propagate it into the package siunitx. But siunitx expects values und no macro code. How can i expand it to the real value? Below the MWE:

Code: Select all

Code, edit and compile here:

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\documentclass[
  fontsize=12pt,% changed because of the package info in the log file
  DIV=14
]{scrreprt}
\usepackage[english]{babel}
\usepackage[binary-units=true, detect-all]{siunitx}[=v2]
\usepackage{readarray}
\usepackage{xifthen}
% siunitx settings
\sisetup {
    exponent-to-prefix  = true,       % convert exponents into belonging prefixes
    round-mode          = places,
    scientific-notation = engineering,% try to use next engineering unit instead of '.'
    per-mode            = symbol,
    per-symbol          = /
}
% Introduces command \csvvalfile[separator]{file.csv} and stores result in \csvvalfield{row, column}
%
% https://tex.stackexchange.com/questions/562789/how-to-look-up-a-cell-value-of-a-multi-column-csv-file
% https://tex.stackexchange.com/questions/301665/error-when-using-num-command-from-siunitx-package-with-an-array-from-arrayjob-p
\newcommand{\csvvalfile}[2][]{%
    % https://stackoverflow.com/questions/2144176/latex-newcommand-default-argument-is-empty
    \ifthenelse{\isempty{#1}} {%default separator
        \readarraysepchar{,}
    } {% else
        \readarraysepchar{#1}
    }%
    \hypercheckbounds
    \readdef{#2}\csvvaldata
    \readarray\csvvaldata\csvvalfielddata[-,\ncols]
}
\newcommand{\csvvalfield}[1]{%
    \arraytomacro\csvvalfielddata[#1]\csvvalfieldval
    \csvvalfieldval
}
 
 
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Run LaTeX here

Thanks for your Help!

[Stefan Kottwitz]

Hi,

this should work:

Code: Select all

1
\SI[parse-numbers = false]{\csvvalfield{3,2}}{\volt}
 
 
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Stefan