for loop values of certain output range

x=3;

for c= -2:1:2;

for q= -2:1:2;

g= (c*x)+q*(c+x);

h= g(all((g>= 5) & (g<=10)));

disp([ 'at c=', num2str(c), 'at q=', num2str(q), ',g=', num2str(h)])

end

end

this code giving me all the itertions of c, q and the values of h are empty for out of range values and showing the values within the range

but i just want the values of h within the range and their respective c&q only

I really need help on this one, time is a factor.

Answer 1

[Johannes Fischer]

Two possible solutions:

x = 3;
idx = 1;
for c = -2:1:2;
    for q = -2:1:2;
        g = (c*x)+q*(c+x);
        % g at this point is a scalar value, since in each iteration q and c are scalars.
        % If you only want the output where g is in range:
        if g >= 5 & g <= 10
            disp([ 'at c=', num2str(c), 'at q=', num2str(q), ',g=', num2str(g)])
            % You might also want to save these values
            C(idx) = c;
            Q(idx) = q;
            G(idx) = g;
            idx = idx+1;
        end
    end
end

There is also a possibly faster solution by not using for-loops

x = 3;

% the base array, as you use it for q and c
a = -2:2;
% now create two vectors whose combination is always unique, have a look at the arrays to confirm this.
c = repelem(a, numel(a));
q = repmat(a, [1, numel(a)]);

% compute all possible values for g
g = c*x + q.*(c+x);

% logical indices for all the elements of g that are in range
inRange = g>= 5 & g<=10;

G = g(inRange);
C = c(inRange);
Q = q(inRange);

Answer 2

[Andrei Bobrov]

x = 3;
c = -2:1:2;
q = -2:1:2;
g = c*x + q.*(c+x);
lo = g >= 5 & g <= 10;
out = table(c(lo),q(lo),g(lo),'Variablenames',{'c','q','g'});