Updates for week4

exercises/02450Toolbox_Matlab/Scripts/ex4_1_1.m

exercises/02450Toolbox_Matlab/Scripts/ex4_1_2.m

exercises/02450Toolbox_Matlab/Scripts/ex4_1_3.m

exercises/02450Toolbox_Matlab/Scripts/ex4_1_4.m

exercises/02450Toolbox_Matlab/Scripts/ex4_1_5.m

exercises/02450Toolbox_Matlab/Scripts/ex4_1_6.m

exercises/02450Toolbox_Matlab/Scripts/ex4_1_7.m

exercises/02450Toolbox_Python/Scripts/ex4_1_2.py

exercises/02450Toolbox_Python/Scripts/ex4_1_3.py

exercises/02450Toolbox_Python/Scripts/ex4_1_4.py

exercises/02450Toolbox_Python/Scripts/ex4_1_5.py

exercises/02450Toolbox_Python/Scripts/ex4_1_6.py

exercises/02450Toolbox_Python/Scripts/ex4_1_7.py

exercises/02450Toolbox_R/Scripts/ex2_1_2.R

exercises/02450Toolbox_R/Scripts/ex4_1_1.R

exercises/02450Toolbox_R/Scripts/ex4_1_2.R

exercises/02450Toolbox_R/Scripts/ex4_1_3.R

exercises/02450Toolbox_R/Scripts/ex4_1_4.R

exercises/02450Toolbox_R/Scripts/ex4_1_5.R

exercises/02450Toolbox_R/Scripts/ex4_1_6.R