Split vector A into smaller vectors based on vector B

Question

Francisco Anaya 2019-3-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/452401-split-vector-a-into-smaller-vectors-based-on-vector-b

编辑： Francisco Anaya 2019-3-27

I have two vectors of same lenght. Vector A contains angle data, and vector B contains gait phase (0=other;1=stand; 2=swing).

I want to split vector A into smallers vector for each individual gait phase cointaining only data during the stance and swing.

My data is as follows:

Vector A Vector B

1.2 1

1.3 1

1.4 1

1.5 2

1.6 2

1.7 0

1.8 0

1.9 2

1.10 2

1.11 1

1.12 1

1.13 0

1.14 1

1.15 1

Then I want to split A into...

Vector C Vector D Vector E Vector F Vector G

1.2 1.5 1.9 1.11 1.14

1.3 1.6 1.10 1.12 1.15

1.4

Thus splitting the data into small vector everytime Vector B changes but ignoring the values of A when Vector B is zero...

Thank you!

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Francisco Anaya 2019-3-26

Before I was using the following, but I didnt have the third condition in B when b is equal to zero...

A = [1.2;1.3;1.4;1.5;1.6;1.7;1.8;1.9;1.1;1.11;1.12;1.13;1.14];

B = [1;1;1;2;2;2;2;2;2;1;1;1;1];

X = cumsum([true;0~=diff(B)])

C = accumarray(X,A,[],@(v){v});

C{:}

ans =

1.2000

1.3000

1.4000

ans =

1.5000

1.6000

1.7000

1.8000

1.9000

1.1000

ans =

1.1100

1.1200

1.1300

1.1400

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KSSV 2019-3-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/452401-split-vector-a-into-smaller-vectors-based-on-vector-b#answer_367419

在 MATLAB Online 中打开

data = [1.2        1
    1.3                1
    1.4                1
    1.5                2
    1.6                2
    1.7                0
    1.8                0
    1.9                2
    1.10              2
    1.11              1
    1.12              1
    1.13              0
    1.14              1
    1.15              1] ;
vecA = data(:,1) ;
vecB = data(:,2) ;
[C,ia,ib] = unique(vecB) ;   % groups
G = length(C) ;
iwant = cell(G,1) ;
for i = 1:G
    A = (vecB==C(i))' ;   
    ii = zeros(size(A));
    jj = A > 0;
    ii(strfind([0,jj(:)'],[0 1])) = 1;
    idx = cumsum(ii).*jj;
    iwant{i} = accumarray( idx(jj)',vecA(jj)',[],@(x){x'});
end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Francisco Anaya 2019-3-27

编辑：Francisco Anaya 2019-3-27

Dear KSSV thank you for your answer. But I have one problem. I have implemented your code as follows:

[C,ia,ib]=unique(r_gait_phase_new); %groups

G=length(C);

iwant=cell(G,1);

for i=1:G

A=(r_gait_phase_new==C(i))';

ii=zeros(size(A));

jj=A>0;

ii(strfind([0,jj(:)'],[0 1]))=1;

idx=cumsum(ii).*jj;

iwant{i}=accumarray(idx(jj)',angle_data_new(jj)',[],@(x){x'});

end

The code works well. However, angle_data_new contains 6 vector data (for 6 different angles, foot, knee and hip). The code you shared only split the data of the first column. How can I obtain the splitted vectors for all 6 vectors contained in angle_data_new??

Thank you so much! You are a lifesaver!

请先登录，再进行评论。

Split vector A into smaller vectors based on vector B

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

回答（1 个）

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

另请参阅

类别

标签

产品

Community Treasure Hunt

Split vector A into smaller vectors based on vector B

1 个评论 显示 -1更早的评论隐藏 -1更早的评论

回答（1 个）

1 个评论 显示 -1更早的评论隐藏 -1更早的评论

另请参阅

类别

标签

产品

Community Treasure Hunt

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

1 个评论
显示 -1更早的评论隐藏 -1更早的评论