Derivative transform of RTCA object, returning the change rate of cell impedance

1 | ```
derivativeTransform(object)
``` |

`object` |
An object of |

The first derivative of the cell impedance curve measured by RTCA. The derivative of the last time point is estimated by that of the next to last point.

An `RTCA`

object populated with derivative values

Jitao David Zhang jitao_david.zhang@roche.com

`smoothTransform`

and `interpolationTransform`

for smoothing and interpolating the RTCA
data. `rgrTransform`

calculates relative growth rate,
which calls `derivativeTransform`

.

1 2 3 4 5 6 | ```
require(RTCA)
ofile <- system.file("/extdata/testOutput.csv", package="RTCA")
x <- parseRTCA(ofile)
xDeriv <- derivativeTransform(x)
``` |

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