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

if statementloop

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.

Best Answer

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

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MATLAB: What does “z” stands for in “solve” function

root(2*G^2*Q^2*m*z^3 - G^2*Q^2*m^2*z^3 - G^2*Q^2*z^3 - 4*G^2*Q^2*m*z^2 + 2*G^2*Q^2*m^2*z^2 + 2*G^2*Q^2*z^2 - G^2*m^2*z^2 - 2*m*z^2 + m^2*z^2 + z^2 + 2*G^2*Q^2*m*z - G^2*Q^2*m^2*z + 2*G^2*m*z - G^2*Q^2*z - G^2, z, 1)

stands for the "first" (#1) value, z, such that 2*G^2*Q^2*m*z^3 - G^2*Q^2*m^2*z^3 - G^2*Q^2*z^3 - 4*G^2*Q^2*m*z^2 + 2*G^2*Q^2*m^2*z^2 + 2*G^2*Q^2*z^2 - G^2*m^2*z^2 - 2*m*z^2 + m^2*z^2 + z^2 + 2*G^2*Q^2*m*z - G^2*Q^2*m^2*z + 2*G^2*m*z - G^2*Q^2*z - G^2 is 0.

Notice that expression is a cubic in z, so there are up to three solutions. Exactly what is meant by the "first" root(EXPRESSION,z,1) , or "second" root(EXPRESSION,z,2) or "third" root(EXPRESSION,z,3) is not really defined for user purposes. Whatever the indexing means, it is used consistently by MATLAB: if you were to fill in all of the variables with numerics, then #1 would always refer to the same root for those coefficients. On the other hand, if you start changing the coefficients, the identities of the roots can appear to change places from our perspective -- if you were to plot changing a parameter but using a constant root number, then you might see an apparent discontinuity, which is not an actual discontinuity in the roots and is only a discontinuity in whatever scheme is used internally to number the roots.

If you were to change your code to

x = solve(eqn, f, 'MaxDegree', 3)

then solve() would construct explicit equations instead of using root() placeholders. This can take some time. This can be used for up to 'MaxDegree', 4 -- that is, you can ask for explicit solutions up to quartics. It isn't usually a good idea, though.

MATLAB: Data Entry with struct

function database = voters(di,varargin)
    if isempty(di)
        database = struct('Name', {}, 'ID', {});
    end
    if rem(nargin,2)==0
        database=di
        return
    end
    si=length(varargin)/2;
    for ii = 1:si
        jj=2*ii;
        if (ischar(varargin{jj-1}) || isstring(varargin{jj-1})) && isa(varargin{jj}, 'double') && (fix(varargin{jj})==(varargin{jj}))
            database(ii) = struct('Name', convertCharsToStrings(varargin{(2*ii)-1}), 'ID', double(varargin{2*ii}));
        else
            database=di
            return
        end
    end
    database=[di database]
end

Best Answer

Related Solutions

MATLAB: What does “z” stands for in “solve” function

MATLAB: Data Entry with struct

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