Praktikum is a formula based program for processing numerical series. Its advantages show especially when a formula is used many times with different entries, either in a parallel way to form a result list from an argument list (e.g. tables of functions, processing of data series from scientific experiments), or in a serial way, when parameters are used in a calculation (e.g. to show the dependence of a function on a certain parameter, multiple repeating of experiments under varying conditions).
Praktikum does not work in a matrix representation mode in the way spreadsheet programs do, but all the given data is capsulated in named variables and referred to under these names in the formulae. Here a variable can be a whole series of data from an experiment or it can be defined as a formula depending on other variables. The variables can then be presented in either tables or graphs.
A simple example: Different resistors are placed in an electrical circuit and the voltage over the resistors is measured. Now you can put the resistance into a variable r, the voltage into a variable u and you can define a formula type variable i as u/r. Praktikum keeps the definition of i, therefore its value is changed with any change of r or u.
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