Dynamic variable names for MATLAB table

Question

Jay Vaidya 2020-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/649233-dynamic-variable-names-for-matlab-table

编辑： Stephen23 2020-11-16

I am making the header names of the table as following:

colnames = [arrayfun(@(x) sprintf('type%d', x), 1:size(all_sorted), 'UniformOutput', false) arrayfun(@(x) sprintf('binary%d', x), 1:size(all_sorted), 'UniformOutput', false) 'result']
a_table = table(result_matrix, 'VariableNames',cell2mat(strcat({str2mat(colnames)})))

But always the last command gives error about

Error using table (line 259)
Invalid parameter name. Parameter name must be a nonempty string or character vector.

I tried a few permutations and combinations of converting the colnames to string, cell2mat, etc. But they give some or the other error. How can I specify the colnames with the above commands or with any of your other suggestions?

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Ameer Hamza 2020-11-16

The statement 1:size(all_sorted) can be confusing and may not mean what you think it means. Explicitly specifying the dimension will be helpful.

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Answer 1

Stephen23 2020-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/649233-dynamic-variable-names-for-matlab-table#answer_545788

编辑：Stephen23 2020-11-16

在 MATLAB Online 中打开

Use array2table instead of table (the wrong function, unless you really want the array in one variable).
Get rid of all of that cell2mat and strcat and str2mat confusion (what are you concatenating? Nothing).

all_sorted = [2;3;5];
result_matrix = randi(5,7)
result_matrix = 7×7
     5     1     1     1     1     2     2
     2     2     4     1     4     5     1
     5     5     2     4     5     3     3
     2     1     5     4     4     2     4
     3     3     2     5     1     4     5
     3     5     4     3     1     3     3
     4     3     4     5     5     2     2
●
nr = size(all_sorted,1);
C1 = arrayfun(@(x) sprintf('type%d', x), 1:nr, 'UniformOutput', false)
C1 = 1x3 cell array
    {'type1'}    {'type2'}    {'type3'}
C2 = arrayfun(@(x) sprintf('binary%d', x), 1:nr, 'UniformOutput', false)
C2 = 1x3 cell array
    {'binary1'}    {'binary2'}    {'binary3'}
VN = [C1,C2,{'result'}];
T = array2table(result_matrix, 'VariableNames',VN)
T = 7x7 table
    type1    type2    type3    binary1    binary2    binary3    result
    _____    _____    _____    _______    _______    _______    ______

      5        1        1         1          1          2         2   
      2        2        4         1          4          5         1   
      5        5        2         4          5          3         3   
      2        1        5         4          4          2         4   
      3        3        2         5          1          4         5   
      3        5        4         3          1          3         3   
      4        3        4         5          5          2         2   