how to find the index of the row
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
Imner Renmi
am 7 Jul. 2016
Bearbeitet: Imner Renmi
am 7 Jul. 2016
Hi,
I want to get the row number in the following case. Say one has a 5 by 1 vector [1;2;3;4;5].
If I have the scalar '4.5' (which is not in that vector) then I know that 4.5 is between 4 and 5. What I want is to compare 4.5 with all the numbers in the vector. Then Matlab should be able to tell that 4.5 is between 4 and 5. My goal is to get the row number of the scalar '4'.
Consequently, if I have a scalar '3.5' then Matlab should be able to tell that 3.5 is between 3 and 4, and in this case I would like to obtain the row number of the scalar '3'
I just do not know how I could code this in Matlab.
Many thanks
0 Kommentare
Akzeptierte Antwort
James Tursa
am 7 Jul. 2016
Bearbeitet: James Tursa
am 7 Jul. 2016
If you are looking for the closest value:
x = your vector
s = your scalar
[~,row] = min(abs(x-s));
If you are looking for the first number <= your scalar and x is sorted increasing:
row = find((x-s) >= 0,1);
If something else, please specify.
3 Kommentare
James Tursa
am 7 Jul. 2016
Bearbeitet: James Tursa
am 7 Jul. 2016
Does the posted code ( row and row+1 ) do what you want? Or Azzi's or Andrei's Answers?
Weitere Antworten (2)
Azzi Abdelmalek
am 7 Jul. 2016
Bearbeitet: Azzi Abdelmalek
am 7 Jul. 2016
v=[8;6;1;2;3;7;5;4]
m=3.5
mv=[m ;v]
[ii,jj]=sort(mv)
idx=find(jj==1)
% m is between a1 and a2,
idx1=jj(idx-1)
idx2=jj(idx+1)
a1=mv(idx1)
a2=mv(idx2)
0 Kommentare
Siehe auch
Kategorien
Mehr zu Matrix Indexing finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!