MATLAB: Is it possible to specify exactly how many decimal points should be displayed in MATLAB 7.6 (R2008a) UITABLE cells

MATLAB

I would like to display the data in UITABLE cells with specific number of decimal digits. Currently MATLAB only lets you use the formats supported by the FORMAT command. I would like to know how to display numeric data in a format that is not amongst one of those supported formats.

It would be nice to have more control over the display format.

Best Answer

The ability to specify number of decimal points displayed in UITABLE cells is not available in MATLAB 7.6 (R2008a).

To work around this issue, use SPRINTF function to convert numeric data to strings with specified format. Once you have this string which contains data in desired format, you can place this string in the UITABLE cell.

For example:

data=12.4395800321;
str=sprintf('%2.10f',data)

Related Solutions

MATLAB: How to right-justify numeric cells in a UITABLE while avoiding scientific notation in MATLAB 7.9 (R2009b)

This functionality cannot be directly implemented in MATLAB 7.9 (R2009b).

As a workaround, you can use SPRINTF to format these numbers as desired. However, strings are left-justified by default in UITABLE cells, therefore you will have to specify the desired string width in the SPRINTF format argument.

The following example shows how to produce right-justified strings with a default width of 10 characters as well as displaying the numbers in a non-scientific notation in a UITABLE:

% Numeric data 
data={0.001; 0.00045; 0.0000238} 
[h,w]=size(data);
data=data(:);
out=repmat({''},1,h*w);
for i=1:h*w
      width=abs(length(num2str(data{i}))-2);
      form=['%10.' num2str(width) 'f'];  % width of 10
      out{i}=sprintf(form,data{i});
end
out=reshape(out,[h w]);
% Make a GUI table object with "fixedwidth" font 
uitable('data',out,'fontname','fixedwidth')

MATLAB: How to format the number displayed on the “uitable” in App Designer

There are three workarounds.

1. Use "format" function

You can specify the format of the displayed numbers using the "format" function.

For example:

% Specify the format using 'format' function
format short e
data(:,1)=num2cell((1:10)');
rng(1);
data(:,2)=num2cell(rand(10,1)*1e5);
% Assign data to the table

app.UITable.Data=data;

The format is specified as "short e". The numbers are displayed with short scientific notation with 4 digits after the decimal point.

Please see the attached file "UseFormat.mlapp" for the full example.

For more information about the 'format' function:

https://www.mathworks.com/help/releases/R2020a/matlab/ref/format.html#btiwmh5-1-style

2. Use "sprintf" function

If you want to have more control on how the number is displayed, you can use the "sprintf" function to convert a number into a string with a specific format. Then display the string on the table.

For example:

data(:,1)=num2cell((1:10)');           
rng(1);      
% Specify the format using 'sprintf' function
data(:,2)=arrayfun(@(x)sprintf('%.2e',x),rand(10,1)*1e5,'UniformOutput',false);
% Set 'ColumnFormat' of the 4th column to be 'numeric'
% to align the displayed text to the right
app.UITable.ColumnFormat(2)={'numeric'};
% Assign data to the table
app.UITable.Data=data;

The numbers are displayed with scientific notation with 2 digits after the decimal point.

In the "arrayfun" function, the option "UniformOutput" is specified as false to make the output of the "arrayfun" to be a cell array.

Please see the attached file "UseSprintf.mlapp" for the full example.

For more information about the "sprinft" function:

https://www.mathworks.com/help/releases/R2020a/matlab/ref/sprintf.html#btf_bfy-3

For more information about the "UniformOutput" option in the "arrayfun" function:

https://www.mathworks.com/help/releases/R2020a/matlab/ref/arrayfun.html?#d120e45463

3. Use the "cellfun" function:

If you are already using a table with mixed types, you can convert to a mixed "cell" array and convert back to a table after the formatting and converting to strings is applied for numeric values.

>> t = table;
t.A = {'a';'b';'c'};
t.B = [1.03;5;2.400]
  t =
  3×2 table
      A       B  
    _____    ____
    {'a'}    1.03
    {'b'}       5
    {'c'}     2.4
t = cell2table(cellfun(@(c) num2str(c, '%g'), table2cell(t), 'UniformOutput', false))
  t =
  3×2 table
    Var1       Var2  
    _____    ________
    {'a'}    {'1.03'}
    {'b'}    {'5'   }
    {'c'}    {'2.4' }

Best Answer

Related Solutions

MATLAB: How to right-justify numeric cells in a UITABLE while avoiding scientific notation in MATLAB 7.9 (R2009b)

MATLAB: How to format the number displayed on the “uitable” in App Designer

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