Convert the hexadecimal representation of a binary double-precision number back into a double

3 Nov 2011
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How can I convert a double-precision hexadecimal back into a double?
That is, given s, created from the double x as such:
s = sprintf('%bx',x)
How can I recover x?

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 Accepted Answer

Fangjun Jiang
Fangjun Jiang on 3 Nov 2011

1 vote

>> x=rand
x =
0.126986816293506
>> s = sprintf('%bx',x)
s =
3fc0411a9f807b7c
>> y=hex2num(s)
y =
0.126986816293506

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Matthew Simoneau
Matthew Simoneau on 3 Nov 2011
That's it! I tried this and thought it wasn't working, but I had previously set "format hex". Thanks.

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