Negitive number from a hex value

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!

[Duke]

Anyone know anything about this, or understand what I'm asking?

Answer 1

[Walter Roberson]

typecast(uint32(hex2dec('FFFFFFBB')),'int32')

Answer 2

[Thomas]

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