why temp command is required

Is there any specific reason for using temp in coding

[Stephen23]

What is temp? A function name, a filename, a variable name, a class name, a method name, or something else? How is it being used?

[Prabha Kumaresan]

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]

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.

Answer 1

[Guillaume]

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.