I am trying to implement a function mapping shown in attached image but not working, pls correct me

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VARDIREDDY
VARDIREDDY 2022-9-8
编辑： ag 2023-11-10
%{
my code not working ,pls correct me
question:
for i=0:1:15 output(A)
'0000' 00
'0001' 01
'0010' 10
'0011' 11
'0100' 11
'0101' 10
'0110' 01
'0111' 00
'1000' 00
'1001' 01
'1010' 10
'1011' 11
'1100' 11
'1101' 10
'1110' 01
'1111' 00
if msb-1==0; output=i(msb-2:end);
else msb-1==1; output=~i(msb-2:end); i.e., ones comp of i(msb-2:end)
%}
N=16;
m= 2^(log2(N)-2); % m=4
A=zeros(1,m);
j=zeros(1,m);
k=zeros(1,m);
for i=0:1:N-1
msb1= bitget(i,log2(N)-1); %msb1=msb-1
if(msb1==0)
j(i+1)=string(dec2bin(i)).extractAfter(1);
A(i+1)=bin2dec(j);
else
j(i+1)=string(dec2bin(i)).extractAfter(1);
k(i+1)=not(j-'0');
A(i+1)=bin2dec(k);
end
end
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VARDIREDDY
VARDIREDDY 2022-9-9
sir ,
msb means 1st position from left .
msb-1 means 2nd position from left .
msb-2 means 3rd position from left .
let i=0:1:15
if msb-1 == 0 , output = 0,1,2,3
if msb-1 == 1 , output = 3,2,1,0
for i=0:1:15
msb-1==0 happens 2 times and
msb-1==1 happens 2 times
therefore
expected output= 0,1,2,3,3,2,1,0,0,1,2,3,3,2,1,0
i am getting following errors:
Error using bin2dec
Input argument must be a character vector, string, or cell array of character vectors.
Error in untitled7 (line 13)
A(i+1)=bin2dec(j);
pls suggest corrections in code

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回答（1 个）

ag
ag 2023-11-10
编辑：ag 2023-11-10
Ran in:
Hi VARDIREDDY,
I understand that you need to implement the following logic:
if the 2nd MSB is 0, output= 3rd MSB to end, else output = One’s complement of 3rd MSB to end.
I’ve made a few changes to your code, as shown below:
N=16;
m= 2^(log2(N)-2); %m = 4
A = ['']; %empty character array for result
for i = 0:N-1
binStr = dec2bin(i, m); % Convert number to binary string
remStr = extractAfter(binStr, 2); %extract the 3rd MSB to end string
if(binStr(2)=='0') % check if the 2nd MSB is 0
A = [A; remStr]; % append the result to answer array
else
A = [A; char(not(remStr-'0') + '0')]; %append the one’s complement of the result to the answer array
end
end
A
A = 16×2 char array
'00' '01' '10' '11' '11' '10' '01' '00' '00' '01' '10' '11' '11' '10' '01' '00'
For more details, please refer to the following documentations:
Hope this helps!
Best Regards,
Aryan Gupta

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