How do I increment the value of a variable after each statement by 1?

I am trying to solve equations using fmincon. I have around 50 non linear constraints.

At the moment i am defining them like

c(1)=..

c(2)=...

.

.

.

c(50)=..

how do i make it simpler like c++ where i can do k=0. c(++k)=....

Answer 1

[KALYAN ACHARJYA]

C=zeros(1,50);
for i=1:50
C(i)=....%
end

[madhan ravi]

Preallocate properly!

[BrokenDreams]

I still dont get it. My function looks like this. How do i stop explicitly typing ceq(1) ceq(2) etc. Kindly provide the code. Thanks

[Walter Roberson]

Create an array instead of assigning to individual elements.

[Steven Lord]

If all your constraints are linear combinations of elements in x, consider writing them as a matrix.

constraints = [-1 1 0 0 0 1 zeros(1, 15); ... % -x(1) + x(2) + x(6);
    0 -1 1 zeros(1, 18); ... % -x(2) + x(3)
    zeros(1, 13) -1 1 zeros(1, 6)]; % -x(14) + x(15)

ceq = constraints*x(:);

Alternately instead of using zeros like I did, you could explicitly type out the 0's. This is more verbose (potentially much more verbose) but would make the structure of your constraint matrices explicit and visible. In the example below, each element of the constraints matrix is a single character wide. I could have typed -1 explicitly, but then to get the coefficients to line up I would need to type " 0" and " 1" in later columns.

N = -1; % N = Negative one
P = 1; % P = Positive one
%                                1 1 1 1 1 1 1 1 1 1 2 2
%              1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
constraints = [N P 0 0 0 P 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0;
               0 N P 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0;
               0 0 0 0 0 0 0 0 0 0 0 0 0 N P 0 0 0 0 0 0];
ceq = constraints*x(:);