R 代码片段到 Python

Question

I would appreciate if someone could provide support in translating this for loop written in R to Python:

iGs<-c()
for (B in 602:6000)
{
  iG3=(2*iG2)-iG1
  iGs[B-602+1]<-c(iG3)
  iG1=iG2
  iG2=iG3
}

assuming that iG1=45 and iG2=46 (ie. single values). As I understand it (newbie in Python here), it should be something like this:

B = range(602,6001,1)
iG3 = (2*iG2)-iG1
iGs = [???]

where iGs is the final list of values (?) after iterating from 602 to 6000, and also after concatenating those values corresponding to 600 and 601 that were previously calculated (ie. iG1 and iG2 ).

Any help is much appreciated.

Answer 1

We could initialize a list in Python

iGs = []

and append

for b in range(602,6001,1):
    iG3 = (2*iG2)-iG1
    iGs.append(iG3)
    iG1=iG2
    iG2=iG3

-checking the output

len(iGs)
#5399

iGs[-5:len(iGs)]
#[5441, 5442, 5443, 5444, 5445]
iGs[0:5]
#[47, 48, 49, 50, 51]

Comparing with R

length(iGs)
#[1] 5399

head(iGs)
#[1] 47 48 49 50 51 52

tail(iGs)
#[1] 5440 5441 5442 5443 5444 5445