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functions to combine two hexadecimal numbers

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Peter
Peter 2011-9-25
I'm doing a project that involves taking in data from an EMG, running it through a function in Matlab, and sending commands to a series of motors. The motors take a series of 2 hex numbers, one 2 digits, one 4 digits preceded by the letter d. For example, d0103FF. My question is, how can I write a series of functions that takes the difference between two numbers, converts it to a zero padded four digit hexadecimal, and then tacks it onto the end of dXX where X is another number.
  2 个评论
Chaowei Chen
Chaowei Chen 2011-9-25
can you give an example about the I/O? If the format is regular, my approach would be to treat d0103FF as a string and read it digit by digit
Peter
Peter 2011-9-25
An EMG signal is going to be processed and classified as a number. This number determines which set of functions to use. The output is d followed by a zero-padded 2 digit hex number followed by a zero padded 4 digit hex number. In order to determine the four digit number,the current motor rotation is subtracted from the desired rotation. This number is turned into hex with dec2hex. I need to figure out how to take the number calculated and insert it after the d and two hex digits.

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采纳的回答

Rick Rosson
Rick Rosson 2011-9-25
y = desired - actual;
h2 = dec2hex(x,2);
h4 = dec2hex(y,4);
out = [ 'd' h2 h4 ];

更多回答（2 个）

Rick Rosson
Rick Rosson 2011-9-25
>> doc dec2hex
>> doc hex2dec
Jan
Jan 2011-9-25
SPRINTF('%x') and the corresponding FPRINTF commands are very fast for the conversion of hexadecimal and decimal numbers - mucgh faster than HEX2DEC and DEC2HEX:
out = sprintf('d%.2x%.4x', x, y)

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