Undefined function or method 'assignDet​ectionsToT​racks' for input arguments of type 'double'

Hi,I don't understand where is the error

function [assignments, unassignedTracks, unassignedDetections] = detectionToTrackAssignment()

        nTracks = length(tracks);
        nDetections = size(centroids, 1);

        % Compute the cost of assigning each detection to each track.
        cost = zeros(nTracks, nDetections);
        for i = 1:nTracks
            cost(i, :) = distance(tracks(i).kalmanFilter, centroids);
        end

        % Solve the assignment problem.
        costOfNonAssignment = 20;
        [assignments, unassignedTracks, unassignedDetections] =assignDetectionsToTracks(cost, costOfNonAssignment);
    end

[luigi]

 This is the error Undefined function or method 'assignDetectionsToTracks' for input arguments of type'double'

Answer 1

[Image Analyst]

You don't have the function assignDetectionsToTracks. Type this in the command window:

which -all assignDetectionsToTracks

if it's there, it will say so. But most likely you don't have that function. Why do you think that you should have it?

[luigi]

I have this situation:

function [assignments, unassignedTracks, unassignedDetections] = detectionToTrackAssignment()

         nTracks = length(tracks);
         nDetections = size(centroids, 1);

         % Compute the cost of assigning each detection to each track.
         cost = zeros(nTracks, nDetections);
         for i = 1:nTracks
             cost(i, :) = distance(tracks(i).kalmanFilter, centroids);
         end

         % Solve the assignment problem.
        costOfNonAssignment = 20;
         [assignments, unassignedTracks, unassignedDetections] = assignDetectionsToTracks(cost, costOfNonAssignment);
   end

maybe this function does not exist in my matlab?

[Image Analyst]

Well, wherever you have it, it's not being seen by MATLAB. Make sure it's on the search path. Do what I said and issue the which command right before you try to call it. It will probably say it can't find it. What folder and m-file is that code you gave in?

[luigi]

sorry but I don't understand the last question. Maybe the folder in on the desktop. I think that the name assignDetectionsToTracks should be the same of detectionToTrackAssignment,or not ?

[Wayne King]

which release are you using? Do you have the Computer Vision System Toolbox installed?

[Image Analyst]

luigi, I have no idea. It's easy enough to try it and see.

[luigi]

I checked in set path and i have the Computer Vision System Toolbox installed. The version of the computer vision toolbox is 4.0, maybe should be updated

[Image Analyst]

The current name is assignDetectionsToTracks - not sure if they changed that or not. Maybe you or someone typed it in and just got it wrong? Did you try to switch names and see if that worked? Of course upgrading is usually the best approach so I'd encourage you to do that.

[luigi]

Hi,I upgraded matlab and I haven't that kind of error

[Image Analyst]

But detectionToTrackAssignment is not a function in the current version, so why would your code suddenly no longer complain about that function?

[luigi]

before I had computer vision toolbox 4.0. After the update I have computer vision toolbox 5.0

[Image Analyst]

I know, but detectionToTrackAssignment is not in there. So unless you changed the name in your code, it will still complain.

[luigi]

I haven't changed the name