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Value Exceeds while dividing

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Pat
Pat 2012-11-26
I have 2 matrices
A ranges between -32768 to 32767 ,it is 100x1 matrix
class(A) is int16
B matrix ranges from -1473 to 1570,it is 100x1 matrix
class(B) is double
asuming i divide manually the values ,max(B)/max(A), i get correct answer , but while runnning in m file , the value exceeds
The maximum value must be .049 ,but i get 1.73,
I converted both A and B to double,still i get same error ,
please assist

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Walter Roberson
Walter Roberson 2012-11-26
What happens if you break it up and display the values:
ma = max(A)
class(ma)
size(ma)
mb = max(B)
class(mb)
size(mb)
mb / ma
mb ./ ma
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Walter Roberson
Walter Roberson 2012-11-26
Any non-zero value divided by 0 gives an infinite result, which is going to be more than 5 bits.
If you have a 14 bit value divided by 1 (which is a valid 16 bit value) then you are going to get a 14 bit value output.
Any 14 bit value divided by a value that could be represented (without compression) in 8 or fewer binary digits, is going to give a result that requires more than 5 bits.
64 (7 bits) / 2 (2 bits) = 32 (6 bits) so the numbers represented as 14 bits can be pretty small and you would still have problems.

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