problems Low-pass Butterworth filter in R
I have a excel data with 1232 points. The sampling frequency is 100Hz, and I have to apply a 5hz low-pass filter, order 5.
by now, I tried this code:
testar<- butter(5,0.1,"low")
L1<-filtfilt(testar, Tabela$posicao)
plot(Tabela$tempo, L1, type = "l")
When I compare with matlab results of the same filter, this one in R shows differents data in the beginning of the graph.
Is there anyone with experience in R that can help me?
r filter
asked Nov 14 '18 at 22:18
Marcos SírioMarcos Sírio
12
add a comment |
I have a excel data with 1232 points. The sampling frequency is 100Hz, and I have to apply a 5hz low-pass filter, order 5.
by now, I tried this code:
testar<- butter(5,0.1,"low")
L1<-filtfilt(testar, Tabela$posicao)
plot(Tabela$tempo, L1, type = "l")
When I compare with matlab results of the same filter, this one in R shows differents data in the beginning of the graph.
Is there anyone with experience in R that can help me?
r filter
asked Nov 14 '18 at 22:18
Marcos SírioMarcos Sírio
12
Please add the reference matlab code.
– Gabriel Devillers
Nov 14 '18 at 22:32
Really impossibly vague at the moment,. Something (we don't know what) is different "at the beginning of the graph". Seems more a methods question about the differences between an unspecified package in R and an unspecified function in Matlab.
– 42-
Nov 15 '18 at 0:27
add a comment |
I have a excel data with 1232 points. The sampling frequency is 100Hz, and I have to apply a 5hz low-pass filter, order 5.
by now, I tried this code:
testar<- butter(5,0.1,"low")
L1<-filtfilt(testar, Tabela$posicao)
plot(Tabela$tempo, L1, type = "l")
When I compare with matlab results of the same filter, this one in R shows differents data in the beginning of the graph.
Is there anyone with experience in R that can help me?
r filter
asked Nov 14 '18 at 22:18
Marcos SírioMarcos Sírio
12
I have a excel data with 1232 points. The sampling frequency is 100Hz, and I have to apply a 5hz low-pass filter, order 5.
by now, I tried this code:
testar<- butter(5,0.1,"low")
L1<-filtfilt(testar, Tabela$posicao)
plot(Tabela$tempo, L1, type = "l")
When I compare with matlab results of the same filter, this one in R shows differents data in the beginning of the graph.
Is there anyone with experience in R that can help me?
r filter
r filter
asked Nov 14 '18 at 22:18
Marcos SírioMarcos Sírio
12
asked Nov 14 '18 at 22:18
Marcos SírioMarcos Sírio
12
asked Nov 14 '18 at 22:18
Marcos SírioMarcos Sírio
12
asked Nov 14 '18 at 22:18
Marcos SírioMarcos Sírio
12
asked Nov 14 '18 at 22:18
Marcos SírioMarcos Sírio
12
12
Please add the reference matlab code.
– Gabriel Devillers
Nov 14 '18 at 22:32
Really impossibly vague at the moment,. Something (we don't know what) is different "at the beginning of the graph". Seems more a methods question about the differences between an unspecified package in R and an unspecified function in Matlab.
– 42-
Nov 15 '18 at 0:27
add a comment |
Please add the reference matlab code.
– Gabriel Devillers
Nov 14 '18 at 22:32
Really impossibly vague at the moment,. Something (we don't know what) is different "at the beginning of the graph". Seems more a methods question about the differences between an unspecified package in R and an unspecified function in Matlab.
– 42-
Nov 15 '18 at 0:27
Please add the reference matlab code.
– Gabriel Devillers
Nov 14 '18 at 22:32
Please add the reference matlab code.
– Gabriel Devillers
Nov 14 '18 at 22:32
Really impossibly vague at the moment,. Something (we don't know what) is different "at the beginning of the graph". Seems more a methods question about the differences between an unspecified package in R and an unspecified function in Matlab.
– 42-
Nov 15 '18 at 0:27
Really impossibly vague at the moment,. Something (we don't know what) is different "at the beginning of the graph". Seems more a methods question about the differences between an unspecified package in R and an unspecified function in Matlab.
– 42-
Nov 15 '18 at 0:27
add a comment |
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Please add the reference matlab code.
– Gabriel Devillers
Nov 14 '18 at 22:32
Really impossibly vague at the moment,. Something (we don't know what) is different "at the beginning of the graph". Seems more a methods question about the differences between an unspecified package in R and an unspecified function in Matlab.
– 42-
Nov 15 '18 at 0:27