Using for loop to access two elements from array
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I am trying to convert an array of bit values into complex values. For every two elements the first is designated as the real part and the second as the imaginary part. I am confused how to access the current index and the next index without exceeding the number of array elements.
str='abc';
str_dec=double(str); %converts to decimal
str_bin=dec2bin(str_dec,8) %converts string from decimal to binary
bits=reshape(str_bin.',1,8*length(str))
QPSK = [];
%grab every two elements from bits to convert to QPSK
for i = length(bits)
%convert bits to complex values
if bits(i) > 1
if bits(i+1) > 1
QPSK = [QPSK, 1+1j];
else
QPSK = [QPSK, 1-1j];
end
else
if bits(i+1) > 1
QPSK = [QPSK, -1+1j];
else
QPSK = [QPSK, -1-1j];
end
end
end
QPSK
回答（1 个）
Forget the loop. It's a four-line operation:
str='abc';
bits=reshape( dec2bin(str,8).' ,1,[]) -'0'; %converts string from decimal to binary
parts=2*bits-1;
QPSK=complex( parts(1:2:end) , parts(2:2:end) )
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2021-3-22
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