Displaying 2 results from an estimated 2 matches for "stepwidth".
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2018 Aug 09
1
Bug in POSIXct string representation?
...a bug in R:
Let me illustrate:
First, enable the display of fractional seconds and check that it works:
> options(digits.secs = 6, digits = 6)
> as.character(as.POSIXct("2018-08-31 14:15:16.123456"))
[1] "2018-08-31 14:15:16.123456"
Now create a sequence of POSIXct with stepwidth 0.1sec:
> test <- as.POSIXct("2018-08-31 14:15:16.000000")
> test_seq <- seq(test, test + 1, by = 1/10)
Calling format with the millisecond conversion specification gives the intended result (even though there is a small representation error):
> format(test_seq, "%F %...
2004 May 27
0
specifying starting values in nlsList/conversion problems
...88281 reduced below `minFactor' of 0.000976563
Error in numericDeriv(form[[3]], names(ind), env) :
Missing value or an Infinity produced when evaluating the model
is there a possibility to specifiy group specific starting or an algorithm
which tests a matrix of starting with a certain stepwidth to overcome the
conversion problems?
thanx for help
***********************************************************
Matthias Schmidt
Forstliche Versuchs- und Forschungsanstalt Baden-W??rttemberg (FVA)
Abteilung Biometrie und Informatik
Wonnhaldestr. 4
79100 Freiburg i. Br
Tel.: + 49 (0)761 / 4018 -1...