# MATLAB: Using a loop, how to access/use values from a structure array that is within a cell array

cell arraysfor loopimage processingImage Processing Toolbox

I have a 1×26 cell that contains the regionprops measurements for 26 images (images with shapes), and within each image measurement cell is a structure array containing its measurements. I am trying to take the area and perimeter values for each image and put it in the following equation: SF = (4 * pi * Area) / (Perimeter^2), and save these values into another array. However, some of the images have multiple labeled objects, and so multiple Area/Perimeter measurements. I can get an individual value by using:
if true  % S = (4 * pi * measurements{i}(k).Area) / ((measurements{i}(k).Perimeter) ^ 2);    % D = dir;Image = cell(1, numel(D));labeled = cell(1, numel(D)); for i = i : numel(D)    Image{i} = imread(D(i).name);  %cell array with 26 images    labeled{i} = bwlabel(Image{i}, 8);      measurements{i} = regionprops(labeled{i}, Image{i}, 'all');end     % AREA = cell(1, numel(D));PERIMETER = cell(1, numel(D));a = cell(1, numel(D));for k = 1 : numel(D)    a{k} = struct2cell(measurements{k});    numOfmeasurements{k} = length(a{k});    for i = 1: numOfmeasurements{k}        AREA{i} = measurements{k}(i).Area;        PERIMETER{i} = measurements{k}(i).Perimeter;    endend
%Cal
Any help would be greatly appreciated.

allAreas = [measurements.Area];allPerimeters = [measurements.Perimeter];circularities = 4*pi*allAreas ./ allPerimeters .^ 2;