# pl2curves

##### Plot 2 Noncentral Distribution Curves for Visual Comparison

Plot two noncentral (chi-squared or \(t\) or ..) distribution curves for visual comparison.

- Keywords
- hplot

##### Usage

```
pl2curves(fun1, fun2, df, ncp, log = FALSE,
from = 0, to = 2 * ncp, p.log = "", n = 2001,
leg = TRUE, col2 = 2, lwd2 = 2, lty2 = 3, …)
```

##### Arguments

- fun1, fun2
`function()`

s, both to be used via`curve()`

, and called with the same 4 arguments,`(., df, ncp, log)`

(the name of the first argument is not specified).- df, ncp, log
parameters to be passed and used in both functions, which hence typically are non-central chi-squared or t density, probability or quantile functions.

- from, to
numbers determining the x-range, passed to

`curve()`

.- p.log
string, passed as

`curve(...., log = log.p)`

.- n
the number of evaluation points, passed to

`curve()`

.- leg
logical specifying if a

`legend()`

should be drawn.- col2, lwd2, lty2
color, line width and line type for the second curve. (The first curve uses defaults for these graphical properties.)

- …
further arguments passed to

*first*`curve(..)`

call.

##### Value

TODO: inivisible return both curve() results, i.e., (x,y1, y2), possibly as data frame

##### See Also

`curve`

, ..

##### Examples

```
# NOT RUN {
p.dnchiBessel <- function(df, ncp, log=FALSE, from=0, to = 2*ncp, p.log="", ...)
{
pl2curves(dnchisqBessel, dchisq, df=df, ncp=ncp, log=log,
from=from, to=to, p.log=p.log, ...)
}
## TODO the p.dnchiB() examples >>>>>> ../tests/chisq-nonc-ex.R <<<
# }
```

*Documentation reproduced from package DPQ, version 0.3-3, License: GPL (>= 2)*