basic matlab help -

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I'm doing strange work if I change the value 202 to variable B and 207 to B. Then by adding B + B to me Returns the correct answer 409. Now if I decrease B then gives me 0 instead of 5. If BTU does not use 202-207 (variable and A) then it gives me -5.

What could be?

EDIT: It also gets awkward. I have just seen that matlab gives me ab = 0 when I give it data matrix A = data (1,1), b = data (2,1) I give 202 and 207 values. If I assign directly to the standards and it does a normal job 

  a = uint8 ( 202)); B = UIT8 (207); & Gt; & Gt; A-b ans = 0> & gt; 202-207 Answer = -5

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