Description Details Slots Objects from the Class Extends Note Author(s) References See Also Examples

Logartithmic transform class, which represents a transformation defined by the function

*f(parameter,a,b)= ln(a*prarameter)*b ~~~~a*parameter>0*

*0
~~~~a*parameter<=0*

`.Data`

Object of class

`"function"`

`a`

Object of class

`"numeric"`

– non-zero multiplicative constant.`b`

Object of class

`"numeric"`

– non-zero multiplicative constant.`parameters`

Object of class

`"transformation"`

– flow parameters to be transformed.`transformationId`

Object of class

`"character"`

– unique ID to reference the transformation.

Objects can be created by calls to the
constructor `logarithm(parameters,a,b,transformationId)`

Class `"singleParameterTransform"`

, directly.

Class `"transform"`

, by class "singleParameterTransform", distance 2.

Class `"transformation"`

, by class "singleParameterTransform", distance 3.

Class `"characterOrTransformation"`

, by class "singleParameterTransform", distance 4.

The logarithm transformation object can be evaluated using the eval method by passing the data frame as an argument.The transformed parameters are returned as a matrix with a single column. (See example below)

Gopalakrishnan N, F.Hahne

Gating-ML Candidate Recommendation for Gating Description in Flow Cytometry V 1.5

exponential, quadratic

Other mathematical transform classes:
`EHtrans-class`

,
`asinht-class`

,
`asinhtGml2-class`

,
`dg1polynomial-class`

,
`exponential-class`

,
`hyperlog-class`

,
`hyperlogtGml2-class`

,
`invsplitscale-class`

,
`lintGml2-class`

,
`logicletGml2-class`

,
`logtGml2-class`

,
`quadratic-class`

,
`ratio-class`

,
`ratiotGml2-class`

,
`sinht-class`

,
`splitscale-class`

,
`squareroot-class`

,
`unitytransform-class`

1 2 3 4 | ```
dat <- read.FCS(system.file("extdata","0877408774.B08",
package="flowCore"))
lg1<-logarithm(parameters="FSC-H",a=2,b=1,transformationId="lg1")
transOut<-eval(lg1)(exprs(dat))
``` |

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