How can I add a column to a table / add a variable to a table?
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Hi there, I want to add columns to a table which seems to be impossible by default. I created a workaround to do this but I wonder if there is a more straightforward way to do this? Thanks very much for your help!
Here's the code:
clear all, clc;
% the point of this script is to analyze region properties of a
% binary image and write them to a file. However, more columns
% should be added before.
% read coins sample and analyze region properties
imageName = 'coins.png';
I = im2bw(imread(imageName));
Cstruct = bwconncomp(I,8);
LC = labelmatrix(Cstruct);
ObjectInfo = regionprops(Cstruct, {'Area','Centroid'});
% Problem:
% it is not possible to add another variable to ObjInfo
% like ObjInfo.newCol = 1:length(ObjectInfo)
% create Table from Results
ObjTable = struct2table(ObjectInfo);
% I want to add columns to the table.
% But adding columns to a table is not possible.
% this is a dirty workaround
ObjTable.rowID = cellstr(num2str(ObjTable.Area));
ObjTable.sampleID = ObjTable.rowID;
ObjTable.imgID = ObjTable.rowID;
a = ObjTable.rowID;
b = ObjTable.sampleID;
c = ObjTable.imgID;
for m=1:numel(a)
a(m) = {m};
b(m) = cellstr(imageName);
c(m) = cellstr(imageName);
end
ObjTable.rowID = a;
ObjTable.sampleID = b;
ObjTable.imgID = c;
clear a b c m;
% done
ObjTable
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