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I would like put picture into table, and my idea is define new command as below>
\newcommand{\EJ471}{\includegraphics[scale=0.150]{EJ_471.jpg}}But compiler reports an error. If I use the command name for example \EJa, everything is all right. I've read similar questions as
But still I don't understand why it does not work.
A long time ago in a galaxy far, far away....
someone wrote this:
By the rules of TeX syntax, the "name" of a macro that starts with a \ (backslash) character must either
\, (insert thin space), \% ( the % character), \\ (insert line break), \[ (open display math), and \) (close inline math).or
a-z and A-Z. No numerals, and no other characters belonging to non-letter categories either. (Well, there are certain ways of assigning "letter-category" status to non-letter characters, but that's a topic for a different discussion.)Therefore, \EJ471 is not a valid macro name.
However, you could define a somewhat more general macro:
\newcommand{\EJ}[1]{\includegraphics[scale=0.150]{EJ_#1.jpg}}
and use it as in \EJ{471} to pass EJ_471.jpg to the \includegraphics command. If you needed to process further jpg files that start with EJ_ (and end in .jpg, of course), you could simply keep invoking this macro with the appropriate arguments.
\EJ471 into a valid TeX macro name after all. However, I may be wrong. :-) Please feel free to provide a separate, longer answer.
There are a variety of methods given here.
Combining some of them I've found this to be the best for a similar situation I was in.
\newcommand{\EJ}[1]{\csname EJ#1\endcsname}
\expandafter\newcommand\csname EJ471\endcsname{\includegraphics[scale=0.150]{EJ_471.jpg}}
\expandafter\newcommand\csname EJ8table\endcsname{\begin{tabular}{c|c} E & J \end{tabular}}
\EJ{471}
\EJ{8table}
This is in the same spirit as Mico's answer, but a little more versatile.
