Create a matrix "z" which has the same elements as "x". If any entry in "z" % is even, increase that entry by one.

Hello,

Can anyone helo me with this one?

Create a matrix "z" which has the same elements as "x". If any entry in "z" is even, increase that entry by one.

Answer 1

[SAA]

What is the part that you're stuck on?

you need to use a for loop and an if else like this:

.... % defining your variables and all that
for i=1:numel(z)
    if mod(z(i),2) == 0 % thats how to see if it's even or not
        z(i) = z(i)+1; % something like this 
    end
end

[STAVROS GALANOS]

Thank you SSA!

I am very new to this and i was not aware of the function 'numel()'. So i was trying to change only the even values but the result was to change all values or no values at all.

cheers !

[Stephen23]

"you need to use a for loop and an if else like this:"

Not true. With MATLAB, neither a loop nor if-else is required, basic logical indexing works perfectly:

>> x = randi(9,3,5)
x =
   6   5   3   4   7
   5   1   6   7   7
   8   8   5   9   4
>> z = x;
>> y = mod(z,2)==0;
>> z(y) = z(y)+1
z =
   7   5   3   5   7
   5   1   7   7   7
   9   9   5   9   5

as do several other even simpler methods which do not require loops or if-else:

>> z = x + ~mod(x,2)
z =
   7   5   3   5   7
   5   1   7   7   7
   9   9   5   9   5

If you are using loops and if-else to solve basic problems like this, then you are not learning how to use MATLAB.