how to sort values depending on other vector?

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

Answer 1

[Steven Lord]

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.

[Shubham Mohan Tatpalliwar]

the main question is solved but i have another question.

if true
  % code
for i= 1:42
for j=0:100:4100
A(i)=sort(Achsemoment==(j) & Achsemoment<=(j+1));
end
end

i am having a vector of length 100000

which contains values from 0 to 4200

and i want to sort them all in step of 100 in different variables...

so tried this but not getting correct code

[Steven Lord]

What is your ultimate goal here? Can you describe your overall application?

Are you trying to count how many elements in Achsemoment fall into each bin? If so use histcounts.

Are you trying to identify into which bin each element falls? That's the third output from histcounts or the first output from discretize.

[Shubham Mohan Tatpalliwar]

What is your ultimate goal here?

to sort the values and count it

If so use histcounts.

yeah i have switched to hit counts but facing the same problem that i could not make a loop

if true
  % code
for i =1:1:42
idxi= Achsemoment >=((i-1)*100) & Achsemoment<(i*100);
end

how should i code to create 42 vectors?

[Steven Lord]

how should i code to create 42 vectors?

Please DON'T.

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]

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