I would like to save .txt file with string matrices, possibly doing some string replacement the matrices delimiters and arranging output for symbolic expressions. For example:

matrix = {{a,b1 b2},{c1/c2,d}}

And I would like to output this to a txt file in the format


Output is more crucial here since I can replace it later using some other tool, but I would assume replacing such strings would also be easy from within Mathematica? Also I reckon that the "space" representation of multiplicatoin might be a bit tricky?


  • 1
    $\begingroup$ It would help to know what you have tried. $\endgroup$
    – C. E.
    May 19, 2020 at 16:24

1 Answer 1


The essence of this method is to realize that InputForm matches quite well your desired format. This format is supported by ToString, so both

ToString[b1 b2, InputForm]



ToString[c1/c2, InputForm]


work as desired. Hence one way is:

matrix = {{a,b1 b2},{c1/c2,d}};
stringmatrix = 
 StringReplace[ToString[matrix, InputForm], {"{" -> "(", "}" -> ")"}]

((a, b1*b2), (c1/c2, d))

Export["matrix.txt", stringmatrix]

Note that this will contain whitespaces, so you might want to delete those. You can do this by adding Whitespace -> "" to the list of replacement rules in StringReplace.

  • $\begingroup$ Ok thanks, this works but I guess my example wasnt general enough...what if I have symbolic fractions in my expressions and I would like those to display with forward slash, say "a/b"? $\endgroup$
    – user191919
    May 19, 2020 at 16:37
  • 3
    $\begingroup$ Please edit your questions so that it actually contains what you want to know... I can edit my answer accordingly. $\endgroup$ May 19, 2020 at 17:00
  • $\begingroup$ Yes, I have edited it. Many thanks. $\endgroup$
    – user191919
    May 19, 2020 at 18:11
  • $\begingroup$ Please see my edit. $\endgroup$ May 19, 2020 at 20:22

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