search for: co2obs

Displaying 4 results from an estimated 4 matches for "co2obs".

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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$residu...
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 draw...
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*tim...