You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
35 lines
1.4 KiB
R
35 lines
1.4 KiB
R
13 years ago
|
##################################################
|
||
|
|
################### It2charge ####################
|
||
|
|
##################################################
|
||
|
|
It2charge <- function (time, current) {
|
||
|
|
## **** STOP USING THIS FUNCTION *** CAUSED WEIRD, UNREPRODUCIBLE ERRORS /110304
|
||
|
|
## Description:
|
||
|
|
## Calculates cumulative charge, differentials, etc. from
|
||
|
|
## amperometric data (current and time).
|
||
|
|
## __Intended to be used from within other functions (CHI.R)__
|
||
|
|
## Usage:
|
||
|
|
## It2charge(time, current)
|
||
|
|
## Arguments:
|
||
|
|
## time: a vector with time data.
|
||
|
|
## current: a vector of the same length as time, with current data.
|
||
|
|
## May be either currents or current densities, no matter.
|
||
|
|
## Value:
|
||
|
|
## Returns a dataframe with columns:
|
||
|
|
## timediff, dIdt, charge, sumcharge
|
||
|
|
#
|
||
|
|
# Calculate the time vector difference
|
||
|
|
timediff <- c(time[1], diff(time))
|
||
|
|
# timediff times the current gives the charge,
|
||
|
|
# since the time vector can be considered as
|
||
|
|
# the cumulative time, while we need to multiply
|
||
|
|
# the current with the time elapsed since the last
|
||
|
|
# current measurement (the timediff).
|
||
|
|
charge <- current * timediff
|
||
|
|
dIdt <- current / time
|
||
|
|
# Return value
|
||
|
|
ff <- data.frame(timediff = timediff,
|
||
|
|
dIdt = dIdt, charge = charge,
|
||
|
|
# perhaps it is more correct to calculate cumsum of the absolute charge?
|
||
|
|
sumcharge = cumsum(charge))
|
||
|
|
return(ff)
|
||
|
|
}
|