how to rename fields in struc and adding new field name
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TESFALEM ALDADA
le 17 Déc 2020
Commenté : TESFALEM ALDADA
le 21 Déc 2020
Hello everyone
I have a stuct to work wit and i wonted to rename the field name (XX) by 'Area (km2)' and also i wanted to add new filed column between YY and ZZ as shown below.
wish you best
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Walter Roberson
le 17 Déc 2020
struct fieldnames must be valid MATLAB identifiers, so spaces and brackets are not permitted.
The characters are permitted in the names of Variables in table() objects.
To add a new field at a particular location, the easiest way is to add the new field and then to use orderfields() to change the order.
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Walter Roberson
le 21 Déc 2020
foo = struct('a', 1, 'b', 2, 'd', 4);
foo.c = 3
%new field has been added but it is out of place
newfoo = orderfields(foo, {'d', 'c', 'b', 'a'})
%and now it is in very specific place
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Jan
le 21 Déc 2020
Adding a field at the end is trivial:
porositiy.newField = [];
Adding a field at a specific location is a bad idea, because the order of fields is not really fixed. But it works:
function S = AddFieldAfter(S, AfterField, NewField, NewData)
SField = fieldnames(S);
SData = struct2cell(S);
nS = numel(S);
sizeS = size(S);
index = find(strcmp(SField, AfterField));
if ~isempty(index)
SField = cat(1, SField(1:index), {NewField}, SField(index + 1:end));
if ~isequal(size(NewData), sizeS)
NewDataC = cell([1, nS]);
NewDataC(:) = {NewData};
end
SData = cat(1, SData(1:index, 1:nS), NewDataC, SData(index + 1:end, 1:nS));
S = reshape(cell2struct(SData, SField), sizeS);
else % Field not found, append at the end:
S.(NewField) = NewData;
end
end
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