Re: [R] Creating a loop that works....
Please don't send messages twice (to [EMAIL PROTECTED] and [EMAIL PROTECTED]).
I'm not going to read all your code, understand your problems and write
your programs. That's probably the right job for a consultant, or a
programmer at your department.
Uwe Ligges
Michael Rennie wrote:
Hi there,
First off, thanks to everyone who has helped me so far. Sorry to keep
pestering you all.
I'm including my code here, and I will comment down it where it is that I am
having problems figuring out how to write this damn thing.
temper - scan(temp2.dat, na.strings = ., list(Day=0, Temp=0))
Read 366 records
Day - temper$Day ; Temp-temper$Temp ;
temp- cbind (Day, Temp)
#Day = number of days modelled, Temp = daily avg. temp.
#temp [,2]
p- 0.558626306252032
ACT - 1.66764519286918
Vc-((CTM-temp[,2])/(CTM-CTO))
Vr-((RTM-temp[,2])/(RTM-RTO))
comp- cbind (Day, Temp, Vc, Vr)
bio-NULL
M- length(Day) #number of days iterated
for (i in 1:M)
+ {
+
+ weight- function(Day)
+ {
+ W-NULL
+ if (Day[i]==1) {W[i] - Wo}
+ elseif (Day[i]1) {W[i] - ((bio[i-1,1]*bio[i-1,9])/Ef)
+ }
+ W
+ }
+
+ W-weight(Day)
The problem, as many of you have already identified, is right here. I hope I
finally have the syntax right, but even if the if else is coded properly, I
don't think R can find the values in the second condition I list. I need W in
each step of the iteration to change slightly, based on the mess of
calculations below (which are using parameters that I have already specified).
After all the calculations are made, I hope to get values in bio[i,1] and bio
[i,9] corresponding to the iteration that just occured, then return to the top
of the loop to combine them into the value of W for the next iteration. What I
think is happening here is that R is looking for values in the condition before
they are actually there- the way I've written it, they can't be there until I
get past the conditional step. Which means I am coding this all wrong. That
said, I'm not sure how else to do it; the value of W in the next iteration is
dependent on the values of Gr and W in the previous iteration, with the
exception of the first one (Day=1). I've tried defining bio as
bio-matrix(NA, ncol=9, nrow=366)
but that doesn't help either.
Perhaps my rbind at the end of the file is incorrect? I think maybe I'm getting
mixed up between calculating vectors and values-- should I be specifying [i]
for everything below where I am now specifying vecotrs?
+ #W-Wo
+
+ C- p*CA*(W^CB)*((comp[,3]^Xc)*(exp(Xc*(1-comp[,3]*Pc
+
+ ASMR- (ACT*RA*(W^(RB))*((comp[,4]^Xa)*(exp(Xa*(1-comp[,4])
+
+ SMR- (ASMR/ACT)
+
+ A- (ASMR-SMR)
+
+ F- (FA*(comp[,2]^FB)*(exp(FG*p))*C)
+
+ U- (UA*(comp[,2]^UB)*(exp(UG*p))*(C-F))
+
+ SDA- (S*(C-F))
+
+ Gr- (C-(ASMR+F+U+SDA))
+ #Day, Temp, Vc, Vr, W, C, ASMR, SMR, A, F, U, SDA, Gr)
+
+ bio- rbind(c(W, C, ASMR, SMR, A, F, U, SDA, Gr))
+
+ dimnames (bio) -list(NULL, c
(W, C, ASMR, SMR, A, F, U, SDA, Gr))
+
+ }
Error: length of dimnames[2] not equal to array extent
Execution halted
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[R] Creating a loop that works....
Hi there,
First off, thanks to everyone who has helped me so far. Sorry to keep
pestering you all.
I'm including my code here, and I will comment down it where it is that I am
having problems figuring out how to write this damn thing.
temper - scan(temp2.dat, na.strings = ., list(Day=0, Temp=0))
Read 366 records
Day - temper$Day ; Temp-temper$Temp ;
temp- cbind (Day, Temp)
#Day = number of days modelled, Temp = daily avg. temp.
#temp [,2]
p- 0.558626306252032
ACT - 1.66764519286918
Vc-((CTM-temp[,2])/(CTM-CTO))
Vr-((RTM-temp[,2])/(RTM-RTO))
comp- cbind (Day, Temp, Vc, Vr)
bio-NULL
M- length(Day) #number of days iterated
for (i in 1:M)
+ {
+
+ weight- function(Day)
+ {
+ W-NULL
+ if (Day[i]==1) {W[i] - Wo}
+ elseif (Day[i]1) {W[i] - ((bio[i-1,1]*bio[i-1,9])/Ef)
+ }
+ W
+ }
+
+ W-weight(Day)
The problem, as many of you have already identified, is right here. I hope I
finally have the syntax right, but even if the if else is coded properly, I
don't think R can find the values in the second condition I list. I need W in
each step of the iteration to change slightly, based on the mess of
calculations below (which are using parameters that I have already specified).
After all the calculations are made, I hope to get values in bio[i,1] and bio
[i,9] corresponding to the iteration that just occured, then return to the top
of the loop to combine them into the value of W for the next iteration. What I
think is happening here is that R is looking for values in the condition before
they are actually there- the way I've written it, they can't be there until I
get past the conditional step. Which means I am coding this all wrong. That
said, I'm not sure how else to do it; the value of W in the next iteration is
dependent on the values of Gr and W in the previous iteration, with the
exception of the first one (Day=1). I've tried defining bio as
bio-matrix(NA, ncol=9, nrow=366)
but that doesn't help either.
Perhaps my rbind at the end of the file is incorrect? I think maybe I'm getting
mixed up between calculating vectors and values-- should I be specifying [i]
for everything below where I am now specifying vecotrs?
+ #W-Wo
+
+ C- p*CA*(W^CB)*((comp[,3]^Xc)*(exp(Xc*(1-comp[,3]*Pc
+
+ ASMR- (ACT*RA*(W^(RB))*((comp[,4]^Xa)*(exp(Xa*(1-comp[,4])
+
+ SMR- (ASMR/ACT)
+
+ A- (ASMR-SMR)
+
+ F- (FA*(comp[,2]^FB)*(exp(FG*p))*C)
+
+ U- (UA*(comp[,2]^UB)*(exp(UG*p))*(C-F))
+
+ SDA- (S*(C-F))
+
+ Gr- (C-(ASMR+F+U+SDA))
+ #Day, Temp, Vc, Vr, W, C, ASMR, SMR, A, F, U, SDA, Gr)
+
+ bio- rbind(c(W, C, ASMR, SMR, A, F, U, SDA, Gr))
+
+ dimnames (bio) -list(NULL, c
(W, C, ASMR, SMR, A, F, U, SDA, Gr))
+
+ }
Error: length of dimnames[2] not equal to array extent
Execution halted
--
Michael Rennie
M.Sc. Candidate
University of Toronto at Mississauga
3359 Mississauga Rd. N.
Mississauga ON L5L 1C6
Ph: 905-828-5452 Fax: 905-828-3792
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