Compare vector to two other vectors
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DucciVinci
el 9 de Mzo. de 2023
Respondida: DucciVinci
el 9 de Mzo. de 2023
I'm struggling with the following binning task:
I have three vectors of different sizes k, m and n. My goal is to get an
-matrix in which the
-th entry simply counts how many elements from the k-vector are simultaneously smaller than both
and
.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1319020/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1319025/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1319030/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1319035/image.png)
So basically I want to do something like
but with one of the inputs as a matrix rather than a vector.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1319040/image.png)
Is there an efficient way to do this?
Of course I can and have also done it with a loop, but that seems terribly inefficient especially since the k from my simplified example is actually really large. Trying to write everything in
-Matrices results in too large arrays unfortunately.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1319045/image.png)
Thanks in advance!
1 comentario
Dyuman Joshi
el 9 de Mzo. de 2023
"Of course I can and have also done it with a loop..."
Can you show what have you tried?
Also, please attach your data using the paperclip button. It will be helpful in providing an answer to your problem.
Respuesta aceptada
Más respuestas (2)
David Hill
el 9 de Mzo. de 2023
m=randi(100,1,20);
n=randi(100,1,30);
k=randi(100,1,10000);
[M,N]=meshgrid(m,n);
x=min(M,N);
z=zeros(size(x));
u=unique(x);
y=sum(k<u,2);
for j=1:length(u)
z(x==u(j))=y(j);
end
0 comentarios
Steven Lord
el 9 de Mzo. de 2023
I think what you want is to use histcounts2 to calculate how many numbers fall into each bin between m(k) and m(k+1) [and between n(k) and n(k+1)] then call cumsum twice, once to sum across the rows and once to sum the matrix from the previous call down the columns.
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