How do I create a matrix that overwrites another if the value is bigger?

Okay here is the problem I am stuck on:

Use a for loop to count how many entries in vector x are larger than the corresponding entry in the vector y. Also, within your for loop, create a vector that will save all of the index values where x(index) > y(index). After the for loop, use an fprintf statement to display how many entries in vector x are larger than the corresponding entry in vector y. Use a disp or fprintf statement to display the vector containing all of the index values where x(index) > y(index).

So far I have this but do not know how to go about comparing/replacing values in the matrices:

x=[1,3,-3,-2,7,10,0,6,9,9,-4,-5]
y=[-3,9,-4,1,10,3,6,0,5,8,-5,7]
count=0;

for x(1,12)>y(1,12)

      count=count+1

end

fprintf('Number of Times the x value is bigger than y = %0.f\n',count);

Answer 1

[Star Strider]

You’re not setting up your loop correctly. You want to loop through both x and y to compare corresponding elements of both. This should get you started:

x=[1,3,-3,-2,7,10,0,6,9,9,-4,-5];
y=[-3,9,-4,1,10,3,6,0,5,8,-5,7];

count = 0;
for k1 = 1:length(x)
    d = x(k1)-y(k1);
    % increment ‘count’ here if ‘d’ is positive
end

Your fprintf call looks good.

[Chad]

Thank you again, you are awesome!!!

[Star Strider]

My pleasure! Thank you for the compliment!