Displaying 2 results from an estimated 2 matches for "verhulst".
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verhelst
2004 Oct 23
1
Legend/Substitute/Plotmath problem
Hello,
I seem unable to construct a legend which contains a substitution as
well as math symbols. I'm trying to do the following:
strain2 <- "YJG48"
legend.txt <- c(
substitute(
strain *
%==% *
"YJG45, rpn10" *
%Delta%,
list(strain=strain2)
),
"Verhulst/Logistic",
"Malthus"
)
legend(
100,2.5,
legend.txt,
cex=0.75,
bty="n",
pch=c(20,NA,NA),
lty=c(NA,1,2)
I derived this from the following "text" command which works,
text(
160,2.2,
cex=0.5,
adj=0,
substitute(
OD[600][~nm] *
" of 2 at " *...
2004 Aug 25
3
Beginners Question: Make nlm work
Hello,
I'm new to this and am trying to teach myself some R by plotting
biological data. The growth curve in question is supposed to be fitted
to the Verhulst equation, which may be transcribed as follows:
f(x)=a/(1+((a-0.008)/0.008)*exp(-(b*x)))
- for a known population density (0.008) at t(0).
I am trying to rework the example from "An Introduction to R" (p. 72)
for my case and am failing miserably. Could somebody glance over the
code below...