Displaying 4 results from an estimated 4 matches for "co2ob".
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coob
2009 Jul 15
0
time series fiting and residual computing
...dly any one
can help correcting me:
#
#I would like to fit a model with Fourth harmonic function as:
#m(t)=a+bt+ct^2+c1sin(omega1*t)+d1cos(omega1.t)+c2sin(omega2.t)+d2cos(omega2.t)+c3sin(omega3.t)+d3cos(omega3.t)+c4sin(omega4.t)+d4cos(omega4.t)
# In my data 'file' I have two variable 'co2obs' and 'time'
# SO above function in R will look like EITHER as:
testfit<-lm(co2obs~1+time+(time^2)+sin(2*pi*time)+cos(2*pi*time)+sin(4*pi*time)+cos(4*pi*time)+sin(6*pi*time)+cos(6*pi*time)+sin(8*pi*time)+cos(8*pi*time),data=file)
#RESIDUALS COMPUTING for above data fit
testfit$resid...
2005 Jan 14
1
how to produce 2-d color plots in R
Hello 'R' Users,
I am very new on 'R', so excuse me if I ask something wrong.
I have ASCII data and the colums of the data are looks like :-
!-------------------------
time,yr,mo,dy,hr,min,sec,lat,lon,ht,co2obs,sigma,co2model
--
-
--
!----------------------------
Each column has data value. Now I want to produce 2-d color maps,
for example the plot should look like :-
on x-axis =lon , on y-axis=lat
and on these two axis I want to shade or fill co2model values.
Also, after ploting how I can dra...
2007 Sep 04
1
interpolation
Hello R Users,
I am new to R and I have simple problem for R users.
I have CO2 observations defined on time axis(yr,mo,day,hr,min,sec). (DATA
ATTACHED HERE)
First I want to convert time axis as one axis as 'hour' on regular interval
as 1 hour. Say 00 hrs to 24hrs(jan1), 25hrs to 48hrs(jan2) and so on.
Then I want to interpolate CO2 at every hour.
Kindly anybody can help,
Many thanks,
2008 Sep 30
0
Root-Mean-Square(RMS) Difference
...g
1993-2002).
In order to do it I am calculating Root-Mean-Square(RMS) difference
with following formula:
> sqrt(sum((observed_residual - simulated_residual)^2)/n) # 'n' is number of
observations
Residuals are computed by fitting a harmonic function on both the data:
>testfit<-lm(co2obs~1+time+I(time^2)+sin(2*pi*time)+cos(2*pi*time)+sin(4*pi*time)+cos(4*pi*time)+sin(6*pi*time)+cos(6*pi*time)+sin(8*pi*time)+cos(8*pi*time),data=file)
#
>testfit1<-lm(co2model~1+time+I(time^2)+sin(2*pi*time)+cos(2*pi*time)+sin(4*pi*time)+cos(4*pi*time)+sin(6*pi*time)+cos(6*pi*time)+sin(8*pi*ti...