Zero size string array

[Christian Kral <dr.christian.kral@…>]

When investigating #4524, I stumbled into a problem with zero size string variables of functions. Please consider the following example:

package TestString
  function zeroSize
    input Real matrix[:, :] "Matrix";
    input String[:,:] header = fill("", 0, size(matrix, 2)) "String matrix";
  algorithm
    Modelica.Utilities.Streams.print("Size of matrix: " + String(size(matrix, 1)) + " x " + String(size(matrix, 2)));
    Modelica.Utilities.Streams.print("Size of header: " + String(size(header, 1)) + " x " + String(size(header, 2)));
    if size(matrix,2)<>size(header,2) then
      Modelica.Utilities.Streams.error("zeroSize: number of columns of matrix ("+String(size(matrix,2))+") and header ("+String(size(header,2))+") do not match");
    end if;
  end zeroSize;

  model TestZeroSize
  parameter Real M[2,2] = [1,2;3,4];
  algorithm 
    when initial() then
      // zeroSize({{1,2},{3,4}});
      zeroSize(M);
    end when;
  end TestZeroSize;
end TestString;

In this example the function zeroSize has the two input variables, matrix and header. Variable header is assigned with a default input: a string zero rows and two columns. The function here just serves as dummy function, logging the dimensions of the two arrays matrix and header and cause an error, in case their number of rows were different.

In the test model TestString the function zeroSize is tested. When simulating the modell, the following error is triggered:

stdout | error | <p>Simulation process failed. Exited with code 255.</p>
stdout | info | <p>Size of matrix: 2 x 2<br>

stdout | info | <p>Size of header: 0 x 0<br>

assert | debug | <p>zeroSize: number of columns of matrix (2) and header (0) do not match</p>
assert | info | <p>simulation terminated by an assertion at initialization</p>

So apparently the number of columns is not determined correctly in the function call. Now change the test model to:

    zeroSize({{1,2},{3,4}});
    // zeroSize(M);

an re-run the simulation test model: everything works fine with no complaints...

[Christian Kral <dr.christian.kral@…>]

Refers to

OMEdit 1.13.0~dev-11-g080cd29
Connected to OpenModelica 1.13.0~dev-142-g6398d16
Linux Mint 18.2 64bit

[Martin Sjölund]

Weird. When I run this, I get the same error for both versions of the zeroSize call...