why temp command is required

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Prabha Kumaresan
Prabha Kumaresan 2017-11-7
回答： Guillaume 2017-11-7
Is there any specific reason for using temp in coding
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Prabha Kumaresan
Prabha Kumaresan 2017-11-7
编辑：Guillaume 2017-11-7
in the below coding temp was being used
ratio=0.1; %Td over Tb: delay spread relative to OFDM frame duration
c=2*pi*ratio;
for j=1:Nuser
temp=[];
for n=1:Ncarrier
nc=(n-1)*c;
entry=(1+i*nc)/(1+nc^2);
temp=[temp entry];
end
Rchan=toeplitz(temp);
could you tell me the working of it.
Stephen23
Stephen23 2017-11-7
temp is not a command as you wrote in your question. It is an array which is used to collect the values of entry into one larger array.

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回答（1 个）

Guillaume
Guillaume 2017-11-7
temp is a poor name for a variable. It's obviously a temporary variable used to calculate something but it doesn't tell you what.
In any case, in your code snippet, temp is not necessary and the way it's calculated is very inefficient. 1) temp could have been preallocated to avoid the resizing at each step of the loop, since it's final size is know:
temp = zeros(1, Ncarrier);
for ...
temp(n) = ...
end
But the loop is not even needed:
for j = 1:Nuser
nc = ((1:Ncarrier)-1)*c;
entry = (1+i*nc) ./ (1+nc/^2);
temp = entry; %or simply use entry instead of temp
...
end
As to why the name temp was chosen, or why it was created, you can only ask the author of this poorly written code.

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