Weird LLOQ printing

[pchelle]

When trying to set and check an LLOQ value in DataSet objects,
The value is oddly printed

> dataSet <- DataSet$new(name = "test")
> dataSet$LLOQ <- 1
> print(dataSet)

DataSet: 
   Name: test 
   X dimension: Time 
   X unit: h 
   Y dimension: Concentration (mass) 
   Y unit: mg/l 
   Error type: 
   Error unit: 
   Molecular weight: 
   LLOQ: 0.999999997475243
   Meta data: 
list()

while the value seems correct

> print(dataSet$LLOQ)
[1] 1

[PavelBal]

Lol, it's the way how R (studio?) prints things in the console.

The actual value of dataSet$LLOQ is 0.99999... (see ".Last.value), print to console rounds it up.

0.9999... instead of 1 arises from unit conversion. When the user sets 1 as LLOQ, it is supposed to be "mg/l", and the value is internally converted to the base unit of the dimension... with numerical imperfection. Nothing we can do here.

[Yuri05]

With the printing setting of 7 decimal places (R default) I would still expect that the print function of the dataset rounds correctly.

E.g. with the standrad print function:

> getOption("digits")
[1] 7
> print(0.999999997475243)
[1] 1

But with the dataset still:

> print(dataSet)
DataSet: 
   ...
   LLOQ: 0.999999997475243 
   ...

Why?

[Yuri05]

I think the error is in the printline function of ospsuite.utils:

https://github.com/Open-Systems-Pharmacology/OSPSuite.RUtils/blob/409d2382eb49f04e9e332a126452b89b0cc2a6e5/R/printable.R#L40-L42

It just prints the value via cat.
But it should check first if the value is numeric and e.g. convert it to string using the format function.
Then the output would be as expected.

> format(dataSet$LLOQ)
[1] "1"