How do you erase rows from matrix based on specific values in the row using loop control?

I have an assignment to do in my advanced structural design class and being a first time MATLAB user im struggling to do task 10. I want to use the same algorithm as shown below but adapted to task 10. Anyone have some tips?? I dont know how to get matrices as outputs...

[madhan ravi]

Always post the code instead of screenshot , so that another person doesn’t have to type your code all over again.

Answer 1

[Ajay Kumar]

doc find.

x1=1;
x2=1;
for i = 1:length(J)
    if find(J(i,:)==77)
        matrix1(x1,:)=J(i,:);
        x1=x1+1;
    else
        matrix2(x2,:)=J(i,:);
        x2=x2+1;
    end
end

Please accept the answer if you got what you need. Thanks :)