hex2dec return error

>> 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.

Answer 1

[David Hill]

hex2dec('238a');

Answer 2

[Steven Lord]

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.

[Jimmy Zhao]

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]

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