How do I sort an array according to the first column?

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lil brain 2022-7-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1769695-how-do-i-sort-an-array-according-to-the-first-column

评论： lil brain 2022-7-28

采纳的回答： Image Analyst

high_empathy_ID_factors.mat

在 MATLAB Online 中打开

Hi,

I have a cell array which I would like to sort according to the first column. But when I try using

high_emp_sort = sort(high_empathy_ID_factors);
% or
high_emp_sort = sortrows(high_empathy_ID_factors);

... then I only get back errors. Could somebody kindly help?

Jeff

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Answer 1

Image Analyst 2022-7-28

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https://ww2.mathworks.cn/matlabcentral/answers/1769695-how-do-i-sort-an-array-according-to-the-first-column#answer_1016785

编辑：Image Analyst 2022-7-28

在 MATLAB Online 中打开

high_empathy_ID_factors.mat

Did you mean by the first numerical column? Like this:

%====================================================================================
% Read in data.
storedStructure = load('high_empathy_ID_factors.mat');
ca = storedStructure.high_empathy_ID_factors;
data = cell2mat(ca(:, 2:end))
data = 17×4
    18    12    14    16
    17    19    15    11
     8    18    14    22
    25    11    17     7
    16    22     9     5
    11    13    14    10
    13    23    16    19
    10    18    17    25
     9    14    14    15
    15    18    17    10
fprintf('Read %d rows by %d columns into data.\n', size(data, 1), size(data, 2));
Read 17 rows by 4 columns into data.
%====================================================================================
% Sort by column 1.
fprintf('Sorting data by column 1.\n');
Sorting data by column 1.
[sortedData, sortOrder] =  sortrows(data, 1);
%====================================================================================
% Sort original cell array also.
fprintf('Sorting original cell array in the same order of rows.\n');
Sorting original cell array in the same order of rows.
ca = ca(sortOrder, :)
ca = 17×5 cell array
    {["61728b3e4e680d6c607f514c"]}    {[ 8]}    {[18]}    {[14]}    {[22]}
    {["5d4a41890e604c00011ade8b"]}    {[ 9]}    {[14]}    {[14]}    {[15]}
    {["5dc4bc30569be3387eb6b52f"]}    {[10]}    {[18]}    {[17]}    {[25]}
    {["5f5e7de4c81d3672642cd612"]}    {[10]}    {[25]}    {[15]}    {[21]}
    {["6134c80f7eab0971588b3d3a"]}    {[11]}    {[13]}    {[14]}    {[10]}
    {["5fb6ed2116919c000a99249e"]}    {[13]}    {[23]}    {[16]}    {[19]}
    {["5b59a51fca6d01000157a8c3"]}    {[14]}    {[ 2]}    {[17]}    {[11]}
    {["611b1d3794ac948af7e57e7a"]}    {[15]}    {[18]}    {[17]}    {[10]}
    {["5fd7782dee03dc08d3f3f491"]}    {[15]}    {[18]}    {[16]}    {[ 1]}
    {["5ecbb2347a5125043b1d3588"]}    {[15]}    {[26]}    {[17]}    {[13]}
    {["6155c449ebffeae654abd854"]}    {[16]}    {[22]}    {[ 9]}    {[ 5]}
    {["5eac84ff4efbe80ffd3962f1"]}    {[16]}    {[13]}    {[18]}    {[ 6]}
    {["5f5503435d41a489068ff50b"]}    {[17]}    {[19]}    {[15]}    {[11]}
    {["61520b079436973e05f72d33"]}    {[18]}    {[12]}    {[14]}    {[16]}
    {["5e92f01a49a5ba62bd0d5693"]}    {[18]}    {[15]}    {[14]}    {[ 7]}
    {["607ed750ad800928b1861317"]}    {[19]}    {[18]}    {[14]}    {[15]}

Or did you really mean by the long alphanumeric hexadecimal strings in the first column? Like this:

%====================================================================================
% Read in data.
storedStructure = load('high_empathy_ID_factors.mat')
storedStructure = struct with fields:
    high_empathy_ID_factors: {17×5 cell}
ca = storedStructure.high_empathy_ID_factors;
data = cell2mat(ca(:, 2:end))
data = 17×4
    18    12    14    16
    17    19    15    11
     8    18    14    22
    25    11    17     7
    16    22     9     5
    11    13    14    10
    13    23    16    19
    10    18    17    25
     9    14    14    15
    15    18    17    10
[rows, columns] = size(data);
fprintf('Read %d rows by %d columns into data.\n', rows, columns);
Read 17 rows by 4 columns into data.
%====================================================================================
% Convert hex numbers in column 1 to decimal
for row = 1 : rows
    c = char(ca{row, 1});
    % Can only convert the first 16 digits.
    numbers(row) = hex2dec(c(1:16));
end
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
Warning: Hexadecimal numbers representing integers greater than or equal to flintmax might not be represented exactly as double-precision floating-point values.
%====================================================================================
% Sort by column 1.
fprintf('Sorting data by column 1.\n');
Sorting data by column 1.
[sortedData, sortOrder] =  sort(numbers)
sortedData = 1×17
1.0e+18 *

    6.5825    6.7223    6.7567    6.8148    6.8220    6.8307    6.8694    6.8721    6.8970    6.9061    6.9532    6.9972    7.0044    7.0118    7.0127    7.0137    7.0218
sortOrder = 1×17
    12     9     8    14    13    16     2    15     7    11    17    10     6     4     1     5     3
%====================================================================================
% Sort original cell array also.
fprintf('Sorting original cell array in the same order of rows.\n');
Sorting original cell array in the same order of rows.
ca = ca(sortOrder, :)
ca = 17×5 cell array
    {["5b59a51fca6d01000157a8c3"]}    {[14]}    {[ 2]}    {[17]}    {[11]}
    {["5d4a41890e604c00011ade8b"]}    {[ 9]}    {[14]}    {[14]}    {[15]}
    {["5dc4bc30569be3387eb6b52f"]}    {[10]}    {[18]}    {[17]}    {[25]}
    {["5e92f01a49a5ba62bd0d5693"]}    {[18]}    {[15]}    {[14]}    {[ 7]}
    {["5eac84ff4efbe80ffd3962f1"]}    {[16]}    {[13]}    {[18]}    {[ 6]}
    {["5ecbb2347a5125043b1d3588"]}    {[15]}    {[26]}    {[17]}    {[13]}
    {["5f5503435d41a489068ff50b"]}    {[17]}    {[19]}    {[15]}    {[11]}
    {["5f5e7de4c81d3672642cd612"]}    {[10]}    {[25]}    {[15]}    {[21]}
    {["5fb6ed2116919c000a99249e"]}    {[13]}    {[23]}    {[16]}    {[19]}
    {["5fd7782dee03dc08d3f3f491"]}    {[15]}    {[18]}    {[16]}    {[ 1]}
    {["607ed750ad800928b1861317"]}    {[19]}    {[18]}    {[14]}    {[15]}
    {["611b1d3794ac948af7e57e7a"]}    {[15]}    {[18]}    {[17]}    {[10]}
    {["6134c80f7eab0971588b3d3a"]}    {[11]}    {[13]}    {[14]}    {[10]}
    {["614ec4f7be36eb900905644c"]}    {[25]}    {[11]}    {[17]}    {[ 7]}
    {["61520b079436973e05f72d33"]}    {[18]}    {[12]}    {[14]}    {[16]}
    {["6155c449ebffeae654abd854"]}    {[16]}    {[22]}    {[ 9]}    {[ 5]}

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Image Analyst 2022-7-28

编辑：Image Analyst 2022-7-28

See my edited answer above.

Or maybe read them into tables with readtable(), and use one of the members of the "join" functions to combine the tables.

lil brain 2022-7-28

The join() function actually worked really well. So I used that as it was the simplest approach thanks!

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How do I sort an array according to the first column?

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How do I sort an array according to the first column?

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