Unable to generate the plot

Script:

load samples.mat
w1_x1 = zeros(1,10);
w1_x2 = zeros(1,10);
w2_x1 = zeros(1,10);
w2_x2 = zeros(1,10);
w3_x1 = zeros(1,10);
w3_x2 = zeros(1,10);
for i = 1:10
    w1_x1(i) = samples(i,1);
    w2_x1(i) = samples(i,4);
    w3_x1(i) = samples(i,7);
    
    w1_x2(i) = samples(i,2);
    w2_x2(i) = samples(i,5);
    w3_x2(i) = samples(i,8);
end
mw1x1 = mean(w1_x1);
mw1x2 = mean(w1_x2);

mw2x1 = mean(w2_x1);
mw2x2 = mean(w2_x2);

mw3x1 = mean(w3_x1);
mw3x2 = mean(w3_x2);

scatter(w1_x1,w1_x2, "red");
title("2D Plot")
xlabel("x1")
ylabel("x2")

hold on 
scatter(w2_x1,w2_x2, "blue");
scatter(w3_x1,w3_x2, "green")
scatter(mw1x1,mw1x2, "red", "filled")
scatter(mw2x1,mw2x2, "blue", "filled")
scatter(mw3x1,mw3x2, "green", "filled")
hold off

Result:

Execution of script samples as a function is not supported:
/MATLAB Drive/samples.m

Error in class_exercise_taskII (line 15)
w1_x1(i) = samples(i,1);

[dpb]

Just what it says -- you can't call a script m-file as if it were a function -- you would have to wrap the above inside the function and end keywords to define the function to use it in that manner and have it return the desired results.

But, it looks like you probably could just as well clean up the above code in line in the other script and put it inline there instead since it appears to do everything

load samples.mat
w1_x1= samples(:,1);
w2_x1= samples(:,4);
w3_x1= samples(:,7);

w1_x2= samples(:,2);
w2_x2= samples(:,5);
w3_x2= samples(:,8);
mw1x1 = mean(w1_x1);
mw1x2 = mean(w1_x2);

mw2x1 = mean(w2_x1);
mw2x2 = mean(w2_x2);

mw3x1 = mean(w3_x1);
mw3x2 = mean(w3_x2);

scatter(w1_x1,w1_x2, "red");
title("2D Plot")
xlabel("x1")
ylabel("x2")

hold on 
scatter(w2_x1,w2_x2, "blue");
scatter(w3_x1,w3_x2, "green")
scatter(mw1x1,mw1x2, "red", "filled")
scatter(mw2x1,mw2x2, "blue", "filled")
scatter(mw3x1,mw3x2, "green", "filled")
hold off