Updates for week4

exercises/02450Toolbox_Matlab/Scripts/ex4_2_1.m

exercises/02450Toolbox_Matlab/Scripts/ex4_2_2.m

exercises/02450Toolbox_Matlab/Scripts/ex4_2_3.m

exercises/02450Toolbox_Matlab/Scripts/ex4_2_4.m

exercises/02450Toolbox_Matlab/Scripts/ex4_2_5.m

exercises/02450Toolbox_Matlab/Scripts/ex4_2_6.m

exercises/02450Toolbox_Matlab/Scripts/ex4_2_7.m

exercises/02450Toolbox_Python/Scripts/ex4_1_1.py

exercises/02450Toolbox_Python/Scripts/ex4_2_1.py

exercises/02450Toolbox_Python/Scripts/ex4_2_2.py

exercises/02450Toolbox_Python/Scripts/ex4_2_3.py

exercises/02450Toolbox_Python/Scripts/ex4_2_4.py

exercises/02450Toolbox_Python/Scripts/ex4_2_5.py

exercises/02450Toolbox_Python/Scripts/ex4_2_6.py

exercises/02450Toolbox_Python/Scripts/ex4_2_7.py

exercises/02450Toolbox_R/Scripts/ex2_1_1.R

exercises/02450Toolbox_R/Scripts/ex4_2_1.R

exercises/02450Toolbox_R/Scripts/ex4_2_2.R

exercises/02450Toolbox_R/Scripts/ex4_2_3.R

exercises/02450Toolbox_R/Scripts/ex4_2_4.R