Negitive number from a hex value

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Duke
Duke 2014-1-29
回答： Walter Roberson 2014-2-4
If I go into the windows calculator and type in -69 in decimal and I convert that to hex I get FFFFFFBB. If I go into MatLab and I type int32(hex2dec('FFFFFFBB')) I get 2147483647. Is there any way that I can take a hex value and get the negative representation of the value, so I’d like FFFFFFBB in MatLab to give me -69. Thanks!
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Duke
Duke 2014-2-4
Anyone know anything about this, or understand what I'm asking?

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采纳的回答

Walter Roberson
Walter Roberson 2014-2-4
typecast(uint32(hex2dec('FFFFFFBB')),'int32')

更多回答（1 个）

Thomas
Thomas 2014-2-4
编辑：Thomas 2014-2-4
2147483647 is Maximum integer value in matlab
you can get that by typing
intmax
so the answer you are getting is not value out of hex2dec but the intmax.
You can use Two's complement to represent negative numbers.
the following link might help http://www.physicsforums.com/showthread.php?t=157612

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