Thanks Berend, setting lower=c(0,0.01) seems to have solved the problem. I
have a dataset with 200+ cropped fields with associated data and wanted to
generate each plot in a way that minimized the visual residuals between the
green squares and blue circles. I have inserted a resulting plot so yo
The error occurs in the x <- solve(A,RHS) statement.
In a certain iteration ylim_2 passed by optim to your function is c(0,0)
That give a zero column of matrix A ==> exactly singular.
If I set lower=c(0,0.01) in the call of optim and use the na.approx then the
result is
ylim_2=c(0, 4.63) with th
Hi Tom,
I followed you suggestion and found the following:
class(temp.dat$WTD)
#[1] "numeric"
temp.dat$WTD<-na.approx(temp.dat$WTD,as.numeric(as.Date(temp.dat$Meas_Date,"%m/%d/%Y")))
class(temp.dat$WTD)
#[1] "numeric"
Have I misunderstood you? If not, then my original confusion still
stands..
check on:
class(temp.dat$WTD)
before and after the na.approx statement, you have changed it from
numeric to character
Best,
Tom
On Thu, Dec 30, 2010 at 3:16 PM, emorway wrote:
>
> Hello,
>
> I was unable to find clues to my problem in ?optim. Using the data and code
> below, I get an error ("sy
Hello,
I was unable to find clues to my problem in ?optim. Using the data and code
below, I get an error ("system is exactly singular") when a particular line
of code is left in, but have found that 'optim' works when I comment it out.
The line of code in question is after the closeAllConnectio
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