Nothing

```
plot.nlsrk = function (x, data, maintitle = "Ordinary Differential Equations system",
...)
{
if (!is.data.frame(data))
stop("*** ERROR : data.frame expected ***\n")
if (!all(names(data) == c("t", "y", "traj")))
stop("*** ERROR : names t,y,traj expected ***\n")
if (class(x) != "nls")
stop("*** ERROR : x of class 'nls' expected ***\n")
plot(data$t, data$y, pch = 19 + as.numeric(data$traj))
u <- cbind(data$t, fitted.values(x))
p <- max(as.numeric(data$traj))
for (i in 1:p) lines(u[data$traj == i, ], col = i)
}
```

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