Replace values in one column based on the content in several other columns.
2 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
merialu
el 13 de Nov. de 2018
Comentada: merialu
el 14 de Nov. de 2018
Hi
I have two matrices containing x,y and z coordinates. These matrices also contain a column with values for each point.
Looks something like this:
A=[x y z value, 1 1 1 1; 1 2 1 0, 2 1 1 3, 2 1 2 4]
B=[x y z value, 1 1 1 1; 1 2 1 0]
the first matrix (A) have much more values than the second one (B). What i am trying to do is to replace the values in the large matrix (A) with the values from the smaller matrix (B) whenever the coordinates are the same. Thus the values in the x y and z column need to match.
Any ideas how to solve this?
0 comentarios
Respuesta aceptada
Bruno Luong
el 13 de Nov. de 2018
A = [1 1 1 0;
1 2 1 1;
2 1 1 3;
1 1 1 3;
2 1 2 4]
B = [1 1 1 1;
1 2 1 0]
[b,loc] = ismember(A(:,1:3),B(:,1:3),'rows');
A(b,:) = B(loc(b),:);
The result after replacement is
A =
1 1 1 1
1 2 1 0
2 1 1 3
1 1 1 1
2 1 2 4
Más respuestas (1)
madhan ravi
el 13 de Nov. de 2018
A=[ 1 1 1 1; 1 2 1 0; 2 1 1 3; 2 1 2 4] %perhaps?
B=[ 1 1 1 1; 1 2 1 0]
index=ismember(A(1:3,:),B,'rows')
A(index,:)=somevalues
0 comentarios
Ver también
Categorías
Más información sobre Graphics Object Programming en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!