I am kind of new to LaTeX. I am doing project which contain resources (formula, solutions to problems, e.g.) i can bring to the Exams day on 16th March. I have been looking for a solution to my problem couple of hours now. What i am trying to achieve is to create a \newcommand with indefinite variable (arguments?) that can do a repetitive task such as 5 \times 10 \times 15 \times 20 \times 25. The numbers are supposed to be the arguments and \times, the repeating task between each argument. I have tried to make a tabular many column inside a \newcommand but have not succeed. To give a better vision, i will post a piece of my code.





\title{Hjelpermidler i Digital Radio}
\author{Sami Rashiti}

\newcommand{\degree}[2]{#1\,^{\circ}\ \mathrm{#2}}



\section*{Innlevering 1}

    e_n &= \sqrt{4KTBR}                                                                     \\
    e_n^2 &= 4KTBR                                                                          \\
    R &= \frac{e_n^2}{4KTB}                                                                 \\
      &= \frac{(\frac{V_o}{A})^2}{4KTB} \qquad ,der \quad e_n = \frac{V_o}{A} = 3,2\mu V    \\
      &= \frac{(3.2\mu V)^2}{4\cdot1.38\cdot 10^{-23}\cdot 310\cdot   100\cdot 10^3}        \\
      &= 6\ k\Omega

  • You can use a list. – Gonzalo Medina Mar 6 '15 at 17:49
  • 1
    As an aside, check out the siunitx package for formatting your units. – Null Mar 6 '15 at 17:50
  • Welcome to TeX.SX! A tip: If you indent lines by 4 spaces or enclose words in backticks `, they'll be marked as code, as can be seen in my edit. You can also highlight the code and click the "code" button (with "{}" on it). – Adam Liter Mar 6 '15 at 17:56

You can use a list; here's an example using etoolbox and borrowing the idea for the first item in the list used by Werner in his answer to Iterating through comma-separated arguments:


  \def\nextitem{\def\nextitem{#1}}% Separator
  \renewcommand*\do[1]{\nextitem##1}% How to process each item
  \docsvlist{#2}% Process list

\Multiply[\times]{4,1.38\cdot 10^{-23},310,100,10^3}\qquad


enter image description here


It's a breeze with xparse and expl3. Separate the items by a comma and that's all.


  \seq_set_split:Nnn \l_tmpa_seq { , } { #2 } % split the input at commas
  \seq_use:Nn \l_tmpa_seq { #1 }              % put #1 between items


$\Multiply[\times]{4,1.38\cdot 10^{-23},310,100,10^3}$



enter image description here

  • Note that, differently from the other answers, this method removes spaces around the items. So with this method, inputting \Multiply{ a , b} is equivalent to inputting \Multiply{a,b}. It's not relevant in this case, because the macro works in math mode, but it can be very important in case of a macro used in normal text. – egreg Mar 9 '15 at 8:55

The common method how to deal more arguments at TeX primitive level is:




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