Creating vectors by rand() and looping it

The question: Create a vector A with 10 integer numbers by rand(), and ceil() or floor() or round. Each number is between 5 and 20. Then iterate through the vector and return a new vector B, containing the true wherever an element of A is greater than 12, and false otherwise.

Use loop(for loop or while loop). Do not use vector operations. Please display both A and B.

I started off creating

a=5

b=20

vector=(b-a)*rand(10,1)+a

ceil(vector)

for the first part with 10 integer between 5-20. I'm little lost in what to do with the next steps, esp the loop.

Answer 1

[James Tursa]

Good start, but do this to save the ceil function result back into vector:

vector = ceil(vector);

For the next part you need a loop. Since you know you will be iterating on each element of A, a for loop with indexing from 1 to numel(A) would be appropriate. To write the code, first just plop the words of the assignment right into the editor like this:

a = 5;
b = 20;
vector = (b-a)*rand(10,1) + a;
vector = ceil(vector);
for iterate through the vector  % turn into code
    new vector B, containing the true wherever an element of A is greater than 12, and false otherwise % turn into code
end
Please display both A and B % turn into code

Once you have that in the editor, try to turn each line that I have indicated into code ... each line may turn into several lines of code. Give it a shot and then come back to us with you attempts and any problems you are having with these next steps.

[Stephen23]

Davifus's "Answer" moved here:

a = 5;
b = 20;
vector = (b-a)*rand(10,1) + a;
vector = ceil(vector);
for i=vector  
    if vector>12
        disp('true')
    else
        disp('false')
    end
end

Im not sure if this is even remotley correct. Just having a hard time with loop&iterate.

[James Tursa]

So, I gave you a clue when I wrote " for loop with indexing from 1 to numel(A)". So this:

for i=1:numel(A)

Then inside this loop, you need to assign a value to B(i) based on the value of A(i).

After the for loop is done, then display both A and B