What is the range of datatype double in Matlab ?

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Ajay Pherwani
Ajay Pherwani 2013-8-21
If we assign any value to a variable , Matlab assigns its data type as double .
What is the max range of that variable ?

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David Sanchez
David Sanchez 2013-8-21
All numerical variables in MATLAB are stored as 32 bit floating point numbers. This corresponds to double precision on most computers. I think it can range from -1.7976931348623158e+308 to -2.2250738585072014e-308, or from 2.2250738585072014e-308 to 1.7976931348623158e+308.
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Laurent
Laurent 2013-8-21
This range is correct, although a double requires 64 bits to store its value.
James Tursa
James Tursa 2013-8-21
编辑：James Tursa 2013-8-21
To clarify the lower range, numbers between these two number ranges are "de-normalized" or "sub-normal", meaning they have less precision (using fewer actual mantissa bits) than a regular double.
>> typecast(uint64(1),'double')
ans =
4.940656458412465e-324
>> realmin
ans =
2.225073858507201e-308
Whereas numbers between these two ranges have full precision (use all available mantissa bits):
>> realmin
ans =
2.225073858507201e-308
>> realmax
ans =
1.797693134862316e+308
Similar for negative numbers.

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