sum values in a vector to extract nth term into new matrix?

Question

MacKenzie 2013-11-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/106643-sum-values-in-a-vector-to-extract-nth-term-into-new-matrix

编辑： Azzi Abdelmalek 2013-11-18

采纳的回答： Azzi Abdelmalek

在 MATLAB Online 中打开

Hello,

I have a matrix:

A =
0000    2.2200
0000    2.2187
0000    2.2171
0000    2.2132
0000    2.2168
0000    2.2277
0000    2.2283
0000    2.2451

I want to take first value and put in new matrix:

[ExtractedA] = A(1,:);

Then, I want it to find the next value that is >= 20; i.e. First values in ExtractedA are:

3.0000    2.2200
9.0000    2.2132          %this value because +5+7+9 = 21 (which is >=20)

Then, I need it to start again looking for the next +20 after the 9:

13.0000 2.2277 %this would be next, since 11+13 >= 20.

Any help on the best function to do this? I know this is likely trivial, but my searching is not yielding much!

Thanks!

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Answer 1

Azzi Abdelmalek 2013-11-18

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/106643-sum-values-in-a-vector-to-extract-nth-term-into-new-matrix#answer_115637

编辑：Azzi Abdelmalek 2013-11-18

在 MATLAB Online 中打开

A =[ 3.0000    2.2200
  5.0000    2.2187
  7.0000    2.2171
  9.0000    2.2132
  11.0000    2.2168
  13.0000    2.2277
  15.0000    2.2283
  19.0000    2.2451];
a=A(1,:);
b=A(2:end,1);
k=1;
jj=1;
idx=[];
while k<=numel(b)
  f(jj)=b(k);
  if sum(f(1:jj))>=20
      idx(end+1)=k;
      jj=1;
     else
      jj=jj+1;
  end
  k=k+1;
end
out=[a;A(idx+1,:)]