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Find position of specific digit in a number

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Inna Pelloso
Inna Pelloso 2023-3-28
编辑： Inna Pelloso 2023-3-28
Hi,
I have A = [123; 312]. How can I find the position of the digit 3 in each element of A? That is, I want B = [3; 1].
Any help would be appreciated.
IP

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Walter Roberson
Walter Roberson 2023-3-28
Ran in:
A = [123; 312]
A = 2×1
123 312
B = cell2mat(strfind(string(A), '3'))
B = 2×1
3 1
This will fail if any entry does not have exactly one 3. And watch out for floating point data, string() will round it.
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Inna Pelloso
Inna Pelloso 2023-3-28
编辑：Inna Pelloso 2023-3-28
Thank you! Also, thank you for all the great insight and answers in the forum over the years, too!

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