Create table from structure - alignment

Question

Alessandro D 2021-6-1

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/845630-create-table-from-structure-alignment

回答： Stephen23 2021-6-2

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!

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Answer 1

Stephen23 2021-6-2

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https://ww2.mathworks.cn/matlabcentral/answers/845630-create-table-from-structure-alignment#answer_714935

在 MATLAB Online 中打开

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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Answer 2

per isakson 2021-6-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/845630-create-table-from-structure-alignment#answer_714845

编辑：per isakson 2021-6-2

在 MATLAB Online 中打开

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"