How to solve the code}
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How to find GF(2^m)
clc;
clear all;
close all;
x1='1100110011';
x2='1111001100';
y0='0000000000';
H ='1111011010'
yy= xor(y0-'0',x1-'0');
y1=gfmul(yy,H);
I got an error as this: Error using gfmul All inputs must be real integers.
Error in hash1 (line 11) y1=gfmul(yy,H);
What correction should i make?
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KSSV
2017년 10월 23일
Read the doc here: https://in.mathworks.com/help/comm/ref/gfmul.html gfmul accepts double i.e matrix as input. You are inputting a string and logical which is not correct.
채택된 답변
Guillaume
2017년 10월 23일
It's not very clear what exactly you're intending to gfmul. If it's the two numbers that are represented by the binary pattern in yy and H (one being a vector of bits, the other a char array of bits), then maybe:
x1 = '1100110011';
x2 = '1111001100';
y0 = '0000000000';
H = '1111011010';
yy = xor(y0-'0',x1-'0');
y1 = gfmul(polyval(yy, 2), bin2dec(H));
polyval(b, 2) converts a vector of bits into the corresponding decimal value. bin2dec(s) converts a char array of bits into the corresponding decimal value. And as you already know, b = s - '0' (and s = char(b + '0')).
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Guillaume
2017년 10월 24일
xor is a logical operator and hence return logical arrays. Converting that to double should resolve your problem (I don't have the comms toolbox):
y1 = gfconv(double(yy), [1 1 1 1 0 1 1 0 1 0],2);
Note that the doc says that if p is 2, you can use the normal operations conv and .*.
추가 답변 (1개)
Walter Roberson
2017년 10월 23일
y1 = gfmul(yy, bin2dec(H));
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Walter Roberson
2017년 10월 23일
gfmul needs three inputs, the third of which describes the galois field.
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