How to write a loop?
Why did you use different variable names rather than index of list/data.frame? On Wed, May 27, 2009 at 6:34 PM, Maithili Shiva
<maithili_shiva at yahoo.com> wrote:
Dear R helpers,
Following is a?R script I am using to run the Fast Fourier Transform. The csv files has 10 columns with titles m1, m2, m3 .....m10.
When I use the following commands, I am getting the required results. The probelm is if there are 100 columns, it is not wise to define 100 commands as fk <- ONS$mk and so on.?Thus, I need some guidance to write the loop for the STEP A and STEP B.
Thanking in advance
Regards
Maithili
My R Script
-----------------------------------------------------------------------------------------------
ONS <- read.csv("fast fourier transform.csv", header = TRUE)
? # STEP A
? f1 <- ONS$m1
? f2 <- ONS$m2
? f3 <- ONS$m3
? f4 <- ONS$m4
? f5 <- ONS$m5
? f6 <- ONS$m6
? f7 <- ONS$m7
? f8 <- ONS$m8
? f9 <- ONS$m9
? f10 <- ONS$m10
#____________________________________________________________________________________________
? # STEP B
? g1 <- fft(f1)
? g2 <- fft(f2)
? g3 <- fft(f3)
? g4 <- fft(f4)
? g5 <- fft(f5)
? g6 <- fft(f6)
? g7 <- fft(f7)
? g8 <- fft(f8)
? g9 <- fft(f9)
? g10 <- fft(f10)
#____________________________________________________________________________________________
? h <- g1*g2*g3*g4*g5*g6*g7*g8*g9*g10
? j <- fft((h), inverse = TRUE)/length(h)
#____________________________________________________________________________________________
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