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Consider some string parameters: Par1, Par2, Par3. Could you please tell me how to compose a filename string of the form:

filename="experiment-Par1_number-Par2_position-Par3.dat"

For the data: e.g.,

Par1="Exp";
Par2="11";
Par3="End";

the filename would be:

filename="experiment-Exp_number-11_position-End.dat"
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3 Answers 3

Reset to default
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Using StringForm:

pars = {"Exp", "11", "End"};

fmtString = "experiment-``_number-``_position-``.dat";

filename = ToString@StringForm[fmtString, Sequence @@ pars]

"experiment-Exp_number-11_position-End.dat"

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    $\begingroup$ Note that the result of StringForm is not a string and thus not usable as file name for Import/Export etc. For those cases, you either need to apply ToString or use StringTemplate instead $\endgroup$ Commented Nov 1, 2022 at 19:00
  • $\begingroup$ Thanks @LukasLang for the correction. $\endgroup$ Commented Nov 1, 2022 at 19:05
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Using StringJoin

par1 = "Exp";
par2 = "11";
par3 = "End";
filename =  "experiment-" <> par1 <> "_number-" <> par2 <> "_position-" <> par3 <> ".dat"

(* "experiment-Exp_number-11_position-End.dat" *)
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I actually like StringTemplate for these kinds of things. It's nicely reusable as a function, like a curried StringForm (but it produces actual strings at the end). You also have the option of naming the template slots

filenameTemplate = StringTemplate["experiment-``_number-``_position-``.dat"];
filename = filenameTemplate["Exp", 11, "End"]

or

filenameTemplate = 
  StringTemplate["experiment-`experiment`_number-`number`_position-`position`.dat"];
filename = filenameTemplate[<|"experiment" -> "Exp", "number" -> 11, "position" -> "End"|>]
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  • $\begingroup$ Without knowing it I have been using a lot of templates for file names but never used StringTemplate. This will greatly tidy up my codebase and make things more legible $\endgroup$ Commented Nov 2, 2022 at 0:56

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