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[?] Concatenate elements in a list?

Geoffrey Marnell
Posted 8 years ago

I'm very new to Mathematica, so here comes a newbie question.

I have a list of numbers, such as {12,35}, and want to concatenate them to produce a single-element list: {1235} in this example. I then want to extract that element as an integer, 1235. Can someone please give me a clue.

Geoffrey Marnell
POSTED BY: Geoffrey Marnell
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Thanks Christopher, thanks Patrick. Geoffrey Marnell
POSTED BY: Geoffrey Marnell
POSTED BY: Christopher French

You can turn a number into a list of its digits using IntegerDigits. If you do that on all your numbers, you have a list where each element is a list of digits. Then you can Flatten this list to get one long list of digits. After that, you rebuild a new Integer.

FromDigits[Flatten[IntegerDigits[{12, 35}]]]

(* 1235 *)
POSTED BY: Patrick Scheibe
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