Negitive number from a hex value

16 vues (au cours des 30 derniers jours)
Duke
Duke le 29 Jan 2014
Réponse apportée : Walter Roberson le 4 Fév 2014
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!
  1 commentaire
Duke
Duke le 4 Fév 2014
Anyone know anything about this, or understand what I'm asking?

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Réponse acceptée

Walter Roberson
Walter Roberson le 4 Fév 2014
typecast(uint32(hex2dec('FFFFFFBB')),'int32')

Plus de réponses (1)

Thomas
Thomas le 4 Fév 2014
Modifié(e) : Thomas le 4 Fév 2014
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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