Dynamic variable names for MATLAB table

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?

[Ameer Hamza]

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.

Answer 1

[Stephen23]

• 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