How to sort a part of a given array?

Question

Lukas Hablowetz 2022-12-7

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编辑： Jonas 2022-12-12

Hello,

I´m looking for a way to sort only a part of a given numeric array in Simulink. Lets say I´ve got an array with 20 elements [20 ... 1]. Depending on the application I just want to sort the first n [5] entries [20 19 18 17 16] in ascending order, so after the sorting the result of the entire array should look like [16 17 18 19 20 15 14 13...1].

Is there a Simulink block which already has this feature? I´m used to the sort block of the DSP toolbox but this only deals with the entire array at once.

Restrictions:

- Solution must be portable to Simulink

- the number n varies during the run-time of my application. It´s a paramter that can be adjust within 1 and 20

- the applicatoin will be converted to a C-Application by the embedded coder so there are also the given C restrictions of fixed array sizes

If there is no block I´d be glad to get any advice, how I could solve this efficiently.

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Answer 1

Karim 2022-12-7

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Hi, below you can find some example code to demonstrate how to sort the first 'nSort' elements of a given vector.

% create a vector with 20 random integers
MyVec = randi(100,1,20)
MyVec = 1×20
    30    30    52    14    12    19    40    15    31   100    60    72    33    16    28     1    55     5    72    39
% define the number of elements we want to sort
nSort = 5;
% sort the first 'nSort' elements:
MyVec(1:nSort) = sort(MyVec(1:nSort),'ascend')
MyVec = 1×20
    12    14    30    30    52    19    40    15    31   100    60    72    33    16    28     1    55     5    72    39

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Lukas Hablowetz 2022-12-12

Unfortunately not, I added some restrictions to the inital description.

But I´ll try to catch up your idea.

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Answer 2

Jonas 2022-12-7

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just use indexing to reassign those numbers

data=20:-1:1
data = 1×20
    20    19    18    17    16    15    14    13    12    11    10     9     8     7     6     5     4     3     2     1
data(1:5)=sort(data(1:5),'ascend')
data = 1×20
    16    17    18    19    20    15    14    13    12    11    10     9     8     7     6     5     4     3     2     1