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Create table from structure - alignment

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Alessandro D
Alessandro D on 1 Jun 2021
I have a structure with scalar fields, say mom, and I would like to display the values of the structure on the screen in aligned columns, possibly with some header. Here is a minimum working example:
mom.a = 1;
mom.b = 2;
mom.veryLongName = 3;
header = {'Moment'; 'Value'};
fnames = fieldnames(mom);
pvec = zeros(numel(fnames),1);
for i = 1:numel(fnames)
pvec(i) = mom.(fnames{i});
end
fprintf('%s \t \t %s \n',header{1},header{2});
for i = 1:numel(fnames)
fprintf('%s \t \t %8.3f \n',fnames{i},pvec(i));
end
This code works OK but the problem is that columns are not aligned, especially if a field has a very long name. This is the output:
Moment Value
a 1.000
b 2.000
veryLongName 3.000
Any suggestion is appreciated!

Answers (2)

per isakson
per isakson on 2 Jun 2021
Edited: per isakson on 2 Jun 2021
I've modified the format specifier.
%%
mom.a = 1;
mom.b = 2;
mom.veryLongName = 3;
header = {'Moment'; 'Value'};
fnames = fieldnames(mom);
pvec = zeros(numel(fnames),1);
for i = 1:numel(fnames)
pvec(i) = mom.(fnames{i});
end
%%
name_len = max( [ strlength(header(1)); cellfun( @strlength, fnames ) ] ) + 2;
%%
fprintf( '%-*s%8s\n', name_len, header{1}, header{2} );
Moment Value
for i = 1:numel(fnames)
fprintf( '%-*s%8.3f\n', name_len, fnames{i}, pvec(i) );
end
a 1.000 b 2.000 veryLongName 3.000
Two thirds down the page fprintf, Write data to text file you find the description of this use of the format specifier. Search for the subsection "Field Width"

Stephen Cobeldick
Stephen Cobeldick on 2 Jun 2021
Simpler:
mom.a = 1;
mom.b = 2;
mom.veryLongName = 3;
hdr = {'Moment'; 'Value'};
tmp = [fieldnames(mom),struct2cell(mom)].';
fprintf(' %-20s %-s\n', hdr{:});
Moment Value
fprintf(' %-20s %-8.3f\n', tmp{:});
a 1.000 b 2.000 veryLongName 3.000

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