how to write this problem
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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);
2 个评论
dpb
2015-1-6
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
2015-1-6
回答（1 个）
Image Analyst
2015-1-6
0 个投票
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.
3 个评论
alexaa1989
2015-1-6
Image Analyst
2015-1-6
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
2015-1-7
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