Read a file contains hexdecimal complex numbers, and convert decimal complex numbers

Question

Jaeyoung 2019-12-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/497891-read-a-file-contains-hexdecimal-complex-numbers-and-convert-decimal-complex-numbers

编辑： Walter Roberson 2019-12-24

采纳的回答： Bhaskar R

real_imag.txt

Hi All,

I want to read a file contains hexdecimal complex numbers, and convert decimal complex numbers.

Each line has one hexdecimal complex number. I want to read all lines, and conver the decimal complex number (real and imag parts) and store them in an array. I tried textread, textscan, and so on. I also tried to read them as "str" and split them into two part and convert and combine later. However, all of my approaches failed actually. Please help!

<real_imag.txt>

fffd+0000*i

0016+0000*i

0000+ffff*i

.

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Answer 1

Bhaskar R 2019-12-24

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https://ww2.mathworks.cn/matlabcentral/answers/497891-read-a-file-contains-hexdecimal-complex-numbers-and-convert-decimal-complex-numbers#answer_407575

编辑：Bhaskar R 2019-12-24

在 MATLAB Online 中打开

data = fileread('real_imag.txt');    % read data in all char
data_hex = regexp(data, '[\d\w]*', 'match');    % divide all into three parts [real, imag, i] with reguler exp
data_dec = hex2dec(data_hex(1:3:end))+hex2dec(data_hex(2:3:end))*i;    % data in decimal

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Answer 2

Walter Roberson 2019-12-24

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https://ww2.mathworks.cn/matlabcentral/answers/497891-read-a-file-contains-hexdecimal-complex-numbers-and-convert-decimal-complex-numbers#answer_407580

编辑：Walter Roberson 2019-12-24

在 MATLAB Online 中打开

There are three possible reasonable interpretations:

fid = fopen('real_imag.txt', 'rt');
data_cell = textscan(fid, '%4x%c%4x');
fclose(fid);
csign = (data_cell{2}=='+')*2-1;
%case where components are unsigned 16 bit and the complex sign is guaranteed positive:
vals_uint16 = complex(uint16(data_cell{1}), uint16(data_cell{3})); 
%case where components are unsigned 16 bit but the complex sign is not guaranteed positive. negative of an unsigned 16 bit needs more than 16 bits
vals_int32 = complex(int32(data_cell{1}), int32(csign) .* int32(data_cell{3}));
%case where components are signed 16 bit and the complex sign is positive just as a notation placeholder
vals_int16 = complex(typecast(uint16(data_cell{1}),'int16'), typecast(uint16(data_cell{3}),'int16')); 