Replace elements in array based on position

I want to replace specific elements within an array with a user input.
For example, the array will contain [a b c d e f g] and the user will input 3 values corresponding to 3 symbols (e.g a=1, c=2, g=6) and the final array will be [1 b 2 d e f 6]
The solution will have to be viable for a 12x1 matrix .
Thanks

 采纳的回答

syms a b c d e f g %requires symbolic toolbox
A=[a b c d e f g]
finalarray=subs(A,{'a','c','g'},{'1','2','6'})

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That's perfect, thank you.

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