lnTransform {flowCore} | R Documentation |
Create the definition of the ln Transformation that will be
applied on some parameter via the transform
method.
The definition of this function is currently x<-log(x)*(r/d).
The transformation would normally be used to convert to a linear valued parameter
to the natural logarithm scale.
Typically r and d are both equal to 1.0. Both must be positive.
lnTransform(transformationId, r=1, d=1)
transformationId |
character string to identify the transformation |
r |
positive double that correponds to a scale factor. |
d |
positive double that correponds to a scale factor |
Returns an object of class transform
.
B. Ellis and N. LeMeur
data(GvHD) lnTrans <- lnTransform(transformationId="ln-transformation", r=1, d=1) ln1 <- transform(GvHD,`FSC-H`=lnTrans(`FSC-H`)) opar = par(mfcol=c(2, 1)) plot(density(exprs(GvHD[[1]])[ ,1]), main="Original") plot(density(exprs(ln1[[1]])[ ,1]), main="Ln Transform")