MATLAB: Is this because of the variable being in a table? If so, how to convert to an array.

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Error using sum Invalid data type. First argument must be numeric or logical.

Error in var (line 148) y = sum(abs(x – sum(x,dim)./n).^2, dim) ./ denom;

Error in std (line 51) y = sqrt(var(varargin{:}));

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table2array

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fid1 = fopen('set_p.txt', 'w');
% Never never never open a file without test for success:
if fid == -1, error('Cannot open file.'), end
prompt2 = 'How many data sets do you want to take?\n';
prompt3 = 'How long do you want the test to run (s)?\n';
prompt4 = 'What sampling interval do you want to have (s)?\n';
prompt5 = 'How long do you want between each data set (s)?\n';
n = input(prompt2);
p = n-1;
x = zeros(1, n);  % Pre-allocate in general
y = zeros(1, n);
z = zeros(1, n);
for j = 1:n
  y(j) = input(prompt3);   % Not y(n), which writes the last element only
  x(j) = input(prompt4);
  if p == 0   % 
     z(j) = 0;       
  elseif j <= p
     z(j) = input(prompt5);    % Not z(p), I guess
  end
end
fprintf(fid1, '%6.3f,', n, y, x, z);
fclose(fid1);

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MATLAB: How to calculate subs inside a loop

MATLAB: Only the last user input is being stored, the rest are being replaced by zeros in the array.

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