how to write this problem

hello everyone and thanks for previous answers. I have the code below

j=[1 2 3];
p=[1 2 1;
   2 3 1;
   3 1 2;
   1 1 2];

now I need to code this:

c(1,3)=p(1,3);
c(2,3)=p(1,3)+p(2,3);
c(3,3)=p(1,3)+p(2,3)+p(3,3);
c(4,3)=p(1,3)+p(2,3)+p(3,3)+p(4,3);

[dpb]

What's the issue? The above looks like perfectly valid Matlab code other than you could write it more succinctly.

HINT:

If that's the actual question, what is the name for the result of adding terms? Look for that in the help. The command

lookfor _keyword_

is very useful utility to learn in this regard as learning Matlab as is the simple

help

and then look at the areas that seem like might be related to your question.

And, of course, the "Getting Started" tutorial stuff shows examples of basic array manipulation.

[alexaa1989]

I need to code it with a FOR loop or a counter Im not sure

Answer 1

[Image Analyst]

Is this homework? Sounds like it. So I'll give you a hint: look up the "cumsum()" function if you want to do that code in 1 or 2 lines.

[alexaa1989]

its part of a genetic algorithm for permutation flow shop and Im a grad student its part of an article im working on not a homework

[Image Analyst]

Try this:

j=[1 2 3]; % Apparently ignored.
p=[1 2 1;
   2 3 1;
   3 1 2;
   1 1 2]; 

% Now I need to code this:
% First method: alexaa's way
c(1,3)=p(1,3);
c(2,3)=p(1,3)+p(2,3);
c(3,3)=p(1,3)+p(2,3)+p(3,3);
c(4,3)=p(1,3)+p(2,3)+p(3,3)+p(4,3);
c % Print to command window.

% Alternative way
d = zeros(size(c));
d(:,3) = cumsum(p(:, 3))

[alexaa1989]

thanks ALOT