Examining CV Data

Creating Tables to Examine the Data
Finding Maximum Peak Currents and Peak Potentials

When we use the function cvSim to create an object it returns to the object a list that contains the following vectors and matrices

time: a vector that contains the discrete times used to define the diffusion grid
distance: a vector that contains the discrete distances used to define the diffusion grid
potential: a vector that contains the discrete applied potentials corresponding to the discrete times used in the simulation
current: a vector that contains the calculated current at each discrete applied potential
oxdata: a matrix that contains the concentrations of the oxidized species in the diffusion grid; each row in the matrix is a discrete time and each column in the matrix is a discrete distance
reddata: a matrix that contains red concentrations of the reduced species in diffusion grid; each row in the matrix is a discrete time and each column in the matrix is a discrete distance
formalE: the redox couple’s formal potential

We can access this data to examine the times, potentials, and currents generated by a simulation. All the functions described here are included in the file cvFunctions.R.

Creating Tables to Examine the Data

A table is a convenient way to examine the relationship between several variables. To create a table, we first use the tableCV function

tableCV(file)

which takes as its only input the name of the object created by cvSim; thus

tableCV(testCV)

The resulting table displays the data across several pages, showing, by default, 10 rows per page. Clicking on the name of a column allows you to reorder the data by its rank.

Finding Maximum Peak Currents and Peak Potentials

Although we can use the table created by the displayTable function to find the maximum peak currents and peak potentials, it is easier to use the summaryCV function

summaryCV(file)

which takes as its only input the name of the object created by cvSim; thus

summaryCV(testCV)

## $note
## [1] "imax: maximum current in A"        "imin: minimum current in A"       
## [3] "epc: cathodic peak potential in V" "epa: anodic peak potential in V"  
## 
## $imax
## [1] 3.58e-07
## 
## $imin
## [1] -2.55e-07
## 
## $epc
## [1] -0.025
## 
## $epa
## [1] 0.05

Note: Although imax corresponds to i_p,c, imin does not correspond to i_p,a as it does not correct for the background current.