load matrix with variable from text file using fileread

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Hi I have a matrix eg :
[ 1 2 3 J
4 5 6 J];
I want to load this into matlab but the letter turns into NaN, i want to import the matrix into matlab then herafter ( in Matlab) define/give a value to ( J )
eg:
J = 2
I have used fileread, which is good for numbers, but turns letters to NaN
  1 Comment
Giuseppe Inghilterra
Giuseppe Inghilterra on 15 Feb 2020
Can you attach a txt file sample? When I use fileread on my own I obtain a character vector and I don't have the behaviour (NaN values) that you have described.

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