How can I equate all values of one vector to another and get the value ? Please find the example below
3 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Rakesh Yadav Kodari
el 18 de Feb. de 2019
Comentada: Jos (10584)
el 18 de Feb. de 2019
If I have
dataA = [1,2,3,4,5,6,7,8,9];
dataB = [0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1];
I need to equate for example: 1 = 0.1, 2=0.2, 3=0.3 so that if I ask value(7) it should display 0.7
Thank you in Advance.
3 comentarios
Rik
el 18 de Feb. de 2019
If your data is already paired, what exactly do you want to do? Mathematically it doesn't really make sense to equate them, as they are not equal. What do you want to use this for? Maybe then we can help you solve that problem instead.
Respuesta aceptada
Andrei Bobrov
el 18 de Feb. de 2019
Editada: Andrei Bobrov
el 18 de Feb. de 2019
dataA = [-496,-636,-52,175,-84,-248,-555,-423,34,-174]';
dataB = [-0.399609375000000,-0.512402343750000,-0.0418945312500000,...
0.140991210937500,-0.0676757812500000,-0.199804687500000,...
-0.447143554687500,-0.340795898437500,0.0273925781250000,-0.140185546875000]';
x = [-636,-84,34];
[lo,ii] = ismember(x,dataA);
out = dataB(ii(lo));
3 comentarios
Stephen23
el 18 de Feb. de 2019
Editada: Stephen23
el 18 de Feb. de 2019
@madhan ravi: you are right, but only if all elements of x are members of dataA. Robust programming would not assume this, which is probably why Andrei Bobrov prefers ii(lo), thus allowing for non-member values without causing an error.
If a non-member value is unacceptable to the algorithm then it would still be better to use assert and write a specific error message, rather than just rely on the uninformative "Indices must be positive integers" that would occur otherwise.
Más respuestas (1)
Jos (10584)
el 18 de Feb. de 2019
You can use logical indexing, a very powerful tool in Matlab
tf = dataB == 7
dataA(tf)
4 comentarios
Stephen23
el 18 de Feb. de 2019
Editada: Image Analyst
el 18 de Feb. de 2019
@Jos: I guess that should be with double equals:
dataB(dataA == -496)
Ver también
Categorías
Más información sobre Numeric Types 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!