alternate of cbind and rbind in loop

Question

I am generating some variables in a loop which I later store into a dataframe one line at a time. I feel that I am using too much of cbind and rbind which is making the code inefficient. What is an alternative to the following structure.

Sys.time()
outData = c()
for (i in 1:40000)
{
  a=0; b=0; c=0;d=0;e=0;f=0;g=0
  #newline = cbind(a,cbind(b,cbind(c,cbind(d,cbind(e,f)))))
  newline = do.call(cbind, list(a,b,c,d,e,f,g))
  outData = rbind(outData, newline)
}
Sys.time()

Edit: do.call() seems to be slower here.

Answer 1

EDIT Based on the new code in the OP:

You dont even need cbind . just whatever you are assigning to a, b, c, d... pyt that right into a data.frame. or at the very worst

newline=data.frame(a,b,c,d...,etc) 

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The inefficiencies are most likely coming from generating i==1000 single row data.frames one at a time. There is likely a much more effective solution.

With regards to the complex cbind line, try the following instead:

    #instead of:
    newline = cbind(a,cbind(b,cbind(.......z,cbind(a1,a2))))))

    # try: 
    newline = do.call(cbind, list(a, b, ..., z))