The filters can be used in pairs since a single filter takes in the history output, which is, in general, a matrix (time versus the selected node values) and returns a row or a column.
For example, suppose the maximum filter is selected, and the return type is column. In that case, the filter will look for the largest value in the history output matrix and return the column where this maximum value is located. This way, the entire time history for the node where the maximum value is determined is reported.
For equation solving a library Ncalc is used, which supports the following functions Ncalc - Functions | ncalc Tutorial. So in order to have a power operator one must use =Pow(value, exponent)