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Problem 16. Return the largest number that is adjacent to a zero giving me error on my correct code

Nabil Miri on 17 Mar 2020
Latest activity Reply by Nabil Miri on 19 Mar 2020

In problem 16 I used the following solution:
function b = nearZero(a)
b = max(a(imdilate(a == 0, [1 1 1])));
end
It is working pretty well on mathlab but when I submit my answer to cody, the following error is generated:
Undefined function 'imdilate' for input arguments of type 'double'.
Error in nearZero (line 2)
b = max(a(imdilate(a == 0, [1 1 1])));
Error in Test1 (line 3)
assert(isequal(nearZero(a),b))

4 Comments

Image Analyst
Image Analyst on 17 Mar 2020
That function is in the Image Processing Toolbox, which evidently you do not have. Type
>> ver
to see what toolboxes you have installed.
Try this to verify whether or not you have the Image Processing Toolbox installed:
% Check that user has the specified Toolbox installed and licensed.
hasLicenseForToolbox = license('test', 'image_toolbox'); % Check for Image Processing Toolbox.
% hasLicenseForToolbox = license('test','Statistics_toolbox'); % Check for Statistics and Machine Learning Toolbox.
% hasLicenseForToolbox = license('test','Signal_toolbox'); % Check for Signal Processing Toolbox.
% hasLicenseForToolbox = license('test', 'video_and_image_blockset'); % Check for Computer Vision System Toolbox.
if ~hasLicenseForToolbox
% User does not have the toolbox installed, or if it is, there is no available license for it.
% For example, there is a pool of 10 licenses and all 10 have been checked out by other people already.
ver % List what toolboxes the user has licenses available for.
message = sprintf('Sorry, but you do not seem to have the Image Processing Toolbox.\nDo you want to try to continue anyway?');
reply = questdlg(message, 'Toolbox missing', 'Yes', 'No', 'Yes');
if strcmpi(reply, 'No')
% User said No, so exit.
return;
end
end
Nabil Miri
Nabil Miri on 19 Mar 2020
Thanks. The movmax() function has worked.
b = max(nonzeros(a(movmax(a == 0, [1 1])))')
Image Analyst
Image Analyst on 17 Mar 2020
imdilate is basically a moving max filter, so see if you can replace imdilate with movmax().

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