Check for coordinate pairs matches in .mat file

I have a .mat file with with four variables : target, time, x and y. Given a pair of x and y detection on a object tracker, I want to check if the pair appears in the file. How do I iterate through this variable to find a matching pair? I don't need the index, just a true of false of whether the match exists or not.

Pseudocode:

load .mat file

isAMatch = -1

if exist(x,y)

isAMatch = 1

else

isAMatch =0

end

Answer 1

[Star Strider]

If I understand the problem correctly, the ismember function may be appropriate —

List = randi(9, 10, 2)

List = 10×2

7 1 6 8 5 4 6 1 3 8 1 8 9 5 5 5 4 1 4 1

toMatch = randi(9, 1, 2)

toMatch = 1×2

6 1

matchedRows = ismember(toMatch, List, 'rows')

matchedRows = logical
   1

numberMatched = nnz(matchedRows)

numberMatched = 1

.

[Star Strider]

My pleasure!

Probably something like this (since I have no idea what the data are) —

yourMatrix = randi(9,10,4)

yourMatrix = 10×4

1 9 5 7 5 4 3 1 9 7 9 2 5 6 2 7 6 1 4 8 1 8 7 2 4 4 2 8 8 4 2 5 8 1 3 3 8 8 7 3

toMatch = yourMatrix(:,[1 2])

toMatch = 10×2

1 9 5 4 9 7 5 6 6 1 1 8 4 4 8 4 8 1 8 8

This should work without changing anything other than the ‘yourMatrix’ variable name in ‘toMatch’.

.

Answer 2

[Ive J]

Assuming both x and y are vectors of same length, this might work:

x = randi([0 5], 10, 1);
y = randi([0 5], 10, 1);

myPairedXY = [2 3]; % i.e. x == 2 and y == 3
isMatched = any(x == myPairedXY(1) & y == myPairedXY(2))

isMatched = logical
   0