hex2dec return error

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Jimmy Zhao
Jimmy Zhao 2020-6-2
编辑： James Tursa 2020-6-3
>> hex2dec(238a)
hex2dec(238a)
↑
Error: Invalid expression. Check for missing multiplication operator, missing or unbalanced
delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.

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回答（2 个）

David Hill
David Hill 2020-6-2
hex2dec('238a');
Steven Lord
Steven Lord 2020-6-2
Since you're using release R2019b you can directly enter hex and binary numbers.
>> x = 0x238a
x =
uint16
9098
See the Release Notes for more information.
  2 个评论
Jimmy Zhao
Jimmy Zhao 2020-6-2
Actually, I want to read form a file with hex data and plot to them. I also want to check if they are negative numbers (> 0x7FFFFFFF). COnvert them to a negative number is it is. which funcation that I can use?
Thanks,
Jimmy
James Tursa
James Tursa 2020-6-3
编辑：James Tursa 2020-6-3
If you are reading a 2's complement hex pattern for a known sized integer, you can just use the simple test you proposed. You could of course typecast the result into a signed integer and then check the sign, but it will give you the same result as the simple test you proposed. If you actually need the value, then just:
u = the unsigned uint16 number
s = typecast(u,'int16'); % the signed int16 number with same bit pattern as u

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