how to find out that the length is odd or even

I'm working on this code:-

R = input('Enter the resistance values in Ohm, [R1....Rn]=');

n = length(R);

Nodd = (-1)^n;

while 1 % will check the values from 1 to n

if (Nodd ~= -1)

fprintf ('The number of resistors should be odd.\n');

R= input('Re-Enter the resistance values in Ohm, [R1....Rn]=');

else

break

end

end

disp ('==============================================================================');

and the problem is that it should check if the length of R is odd. if not, it should ask to re-enter an odd length of the answer but when the user inputs an even length and then re-enter an odd length the code keeps looping, so did i forget anything? or the code is wrong? and if there is any other way to type the even_odd code share it with me please. thanks

Answer 1

[VBBV]

R = 0:0.1:9.1;  % example with 
n = length(R)

n = 92

    
    while 1 % will check the values from 1 to n
        Nodd = (-1)^n;
            if (Nodd ~= -1)
                fprintf ('The number of resistors should be odd.\n');
                R= 93; % here the user enters odd sized vector 'Re-Enter the resistance values in Ohm, [R1....Rn]='; 
                n = length(R);
            else
                disp('The number of resistors are odd')
                break 
                
            end             
    end

The number of resistors should be odd.

The number of resistors are odd

[mohamed]

It keeps looping.

[VBBV]

if you run the program as it is, it will not work since the new value of length is not entered yet. I disabled the input function in the if-block, because i cannot test it online, When you run it in standalone version of Matlab, you can enable input function and then enter resistance vector with odd number, it will work

[mohamed]

it worked! thank you so much.

Answer 2

[Image Analyst]

Nodd = rem(n, 2)