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Help with syntax for a self-made function

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Teshan Rezel
Teshan Rezel on 12 Aug 2021
Commented: Teshan Rezel on 16 Aug 2021
Hi folks,
I have the following function defined in Matlab but am getting an error when running. The error and the code are below. May I please ask for help with debugging this?
Thanks in advance
function fields = populateFields(index, structure)
Area(index) = getfield(structure, 'Area');
MajorAxisLength(index) = getfield(structure, 'MajorAxisLength');
MinoeAxisLength(index) = getfield(structure, 'MinorAxisLength');
Eccentricity(index) = getfield(structure, 'Eccentricity');
Orientation(index) = getfield(structure, 'Orientation');
ConvexArea(index) = getfield(structure, 'ConvexArea');
Circularity(index) = getfield(structure, 'Circularity');
EquivDiameter(index) = getfield(structure, 'EquivDiameter');
Solidity(index) = getfield(structure, 'Solidity');
Extent(index) = getfield(structure, 'Extent');
Perimeter(index) = getfield(structure, 'Perimeter');
MaxFeretDiameter(index) = getfield(structure, 'MaxFeretDiameter');
MaxFeretAngle(index) = getfield(structure, 'MaxFeretAngle');
MinFeretDiameter(index) = getfield(structure, 'MinFeretDiameter');
MinFeretAngle(index) = getfield(structure, 'MinFeretAngle');
end
function call:
[matrix, numObjects] = bwlabel(mask1);
rg = regionprops(matrix, 'all');
fields = populateFields(1, rg);
The error:
Output argument "fields" (and maybe others) not assigned during call to "Threshold>populateFields".

Accepted Answer

Simon Chan
Simon Chan on 12 Aug 2021
Edited: Simon Chan on 12 Aug 2021
You have not define your output variable 'fields' in your function, so nothing returns from the function
  11 Comments
Teshan Rezel
Teshan Rezel on 16 Aug 2021
@Stephen Cobeldick thanks for this! I tried the former, but run across this error when partway through the loop, and am not sure what's causing it...I tried defining the variable RG = zeros(numImages, 32) at the start but the error still occurs at the 465th value of i. Can I please ask you why this might be?
Unable to perform assignment because the left and right sides have a different number of elements.

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