You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: MAE.m
    path of file: ./repos/orca/src/Measures
    
    the code of the file until where you have to start completion: classdef MAE < Metric
    %MAE static class to calculate the mean absolute error (MAE). Values range
    %   from 0 to J-1, where J is the number of classes.
    %
    %   MAE methods:
    %      CALCULATEMETRIC            - Computes the evaluation metric
    %      CALCULATECROSSVALMETRIC    - Computes the evaluation metric as an error
    %
    %   References:
    %     [1] S
    
function value = calculateCrossvalMetric(argum1,argum2)
            %CALCULATECROSSVALMETRIC Computes the evaluation metric and returns
            %it as an error.
            %   METRIC = CALCULATECROSSVALMETRIC(CM) returns calculated metric from confussion
            %   matrix CM
            %   METRIC = CALCULATECROSSVALMETRIC(actual, pred) returns calculated metric from
            %   real labels (ACTUAL) labels and predicted labels (PRED)
            if nargin == 2,
                value = MAE.calculateMetric(argum1,argum2);
            else
                value = MAE.calculateMetric(argum1);
            end