how to sort values depending on other vector?

4 vues (au cours des 30 derniers jours)
Shubham Mohan Tatpalliwar
Shubham Mohan Tatpalliwar le 23 Oct 2018
Rouvert : Walter Roberson le 22 Déc 2018
if true
% code
x=[0,50,150,100,50,150,0,100,150,0,50,150]
y=[1,2,3,3,2,1,1,2,3,3,2,1]
i want to sort y as 0 to 1, 1 to 2 and 2 to 3
for x 0 to 50 and 50 to 100

Réponses (1)

Steven Lord
Steven Lord le 23 Oct 2018
If I understand what you've described correctly, you want to sort y and break ties among elements in y that have the same value based on the corresponding elements of x. Is that right? If so, you can pack the two vectors into a matrix and use sortrows to sort first by the column corresponding to y then by the column corresponding to x. In my sample code below, the y column is column 2 and the x column is column 1 so I sortrows using [2 1].
x = [0,50,150,100,50,150,0,100,150,0,50,150]
y = [1,2,3,3,2,1,1,2,3,3,2,1]
M = [x.', y.']
M2 = sortrows(M, [2 1])
If you need to know which row in M went to which row in M2 (or equivalently which elements in x and y went where in M2) call sortrows with two outputs.
  5 commentaires
Steven Lord
Steven Lord le 23 Oct 2018
how should i code to create 42 vectors?
How are you planning to use that data? I suspect your ultimate goal is not "to sort the values and count it" -- unless this is part of a homework assignment, I expect you want to do something with the sorted data and/or the counts. What is that something?
Shubham Mohan Tatpalliwar
Shubham Mohan Tatpalliwar le 23 Oct 2018
Modifié(e) : Shubham Mohan Tatpalliwar le 23 Oct 2018
from this sorted values
further i want to to sort them on next parameter
like sort(idx1(d>=0 & d<2)
and count the total number of the logical 1
and i want to do it for every vector i.e. every sterp (0 to 100 and so on)
which is time
and this time would be used for further calculations
this is the part of my project and the excel file is bigger so i cannot share it directly on the mathworks portal

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