MATLAB: How to programmatically extract the line number at which a caught error occurred

MATLAB

How can I programmatically extract the line number at which a caught error occurred?

Best Answer

The line number at which a caught error occurred is stored in the MException object. For example, the error number is being extracted from the "mErr" MException object. in the following code:

try
    surf
catch mErr
    error_line = mErr.stack(end).line;
end

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MATLAB: How to use the exist feature with an if statement

if exist('VarName','var')

MATLAB: Caught in loop

And some cleanup:

...
% Vectorization of the "for i=1:N_i;" loop:
r = (0:N_i) * dr;
c = zeros(N_i, N_t - 1);  % Pre-allocate!
c(:, 1)       = c_inf;
c(r < a_0, 1) = c_s;
...
dr3 = dr ^ 3;
...
  % Reduce repeated calculations inside the "for j = 1:N_t -1" loop:
  ajp1   = a(j) +dt*beta*dc_dr;
  a(j+1) = ajp1;
  tmp1   = (a(j)^2) * (alpha-1) * (ajp1-a(j)) / (2 * dr3);
  for i = 2:N_i - 1
    if r(i) > ajp1
      tmp2 = rho / (i-1) + tmp1 / ((i-1)^2);
      d = rho - tmp2;
      e = 1 - 2 * rho;
      f = rho + tmp2;
      c(i, j+1) = d*c(i-1,j) + e*c(i,j) + f*c(i+1, j);
    elseif r(i) == ajp1
      c(i, j+1) = c_a;
    else
      c(i, j+1) = c_s;
    end
    % disp(c(i,j));
  end

Best Answer

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MATLAB: How to use the exist feature with an if statement

MATLAB: Caught in loop

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