Macros Function With Optional Arguments Tex Latex Stack Exchange I have used tex for some time, but never really 'coded' with it; please bear with me ; ) i'm currently writing something that involves a lot of different norms and i want to write a macro function that eases up the tex ing. The general idea behind creating "optional arguments" is to first define an intermediate command that scans ahead to detect what characters are coming up next in the token stream and then inserts the relevant macros to process the argument (s) coming up as appropriate.
Macros Function With Optional Arguments Tex Latex Stack Exchange Do you remember that in this post i gave you a brief introduction to macros without arguments, these are helpful in those situations where you need the same expression multiple times, but what if you need to have the same expression but just modify something?. When a stacking macro does not explicitly ask for one of the quantities defined by these defaults, it will use the values of these parameters to serve as the default value. however, some stacking macros may ask the user to specify an explicit value for any number of these parameters in the calling arguments. If you need several optional arguments or an argument other than the first one should be optional, you can either chain \@ifnextchar s (as in yiannis' answer), or use xparse (as in peter's answer). I'm a bit confused as to how latex parses square brackets optional macro arguments. i'll try to explain what i understood by means of the macro \section which has one optional and one mandatory argument.
Macros Optional Arguments In Plain Tex Tex Latex Stack Exchange If you need several optional arguments or an argument other than the first one should be optional, you can either chain \@ifnextchar s (as in yiannis' answer), or use xparse (as in peter's answer). I'm a bit confused as to how latex parses square brackets optional macro arguments. i'll try to explain what i understood by means of the macro \section which has one optional and one mandatory argument. I'm working on a macro that should save me a lot of time in the future. i've currently got one of the commands working that i wanted but i am having trouble with getting the second part to work. However i'm wondering if it is possible to group the optional arguments d(){.} d<> from \renewdocumentcommand{\section}{s d(){.} d<> o{#5} m} before passing them to the command so that i can have a "preset" number of options. Thus, to create a syntax that provides an optional argument, 2 mandatory arguments, and then 2 optional arguments, requires 3 macros to be strung together successively, since there are 3 optional arguments requested. You can check if a single argument macro's arg in turn consists of three or two or one brace delimited arguments, i.e., \c{{a}{b}{c}}, but then you need to specify behavior for other cases and spaces as well.
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