Access to memory store via global in matlab function

Don't know how I managed this

Note how the second error report one simulation time step later exactly contradicts the first one from t=0.

I'm just using a matlab function to access a Simulink data store.

Here are the settings for it

Here is the code that raises the errors

% t is input from a clock block

% size(Screen)=[5 8]

function DOIT(t, Screen)
    global CurrentSEPScreen;

      if t==0 % Initialise - Shouldn't be necessary, but errors are raised

          % Can't get rid of that error, trying different initialisation approaches.
          Y=[32 32 32 32 32 32 32 32];
  %         CurrentSEPScreen(1,:)=Y;
  %         CurrentSEPScreen(2,:)=Y;
  %         CurrentSEPScreen(3,:)=Y;
  %         CurrentSEPScreen(4,:)=Y;
  %         CurrentSEPScreen(5,:)=Y;

          CurrentSEPScreen=[Y;Y;Y;Y;Y];

      else

          for RowN=1:5
              if any(Screen(RowN,:)~=CurrentSEPScreen(RowN,:))
                  CurrentSEPScreen(RowN,:)=Screen(RowN,:);
              end 
          end

      end
  end

Answer 1

[Fangjun Jiang]

I think the warning message is clear. If you want to ignore this, go to Simulation, Model Configuration Parameters, Diagnostics, Data Validity, Data Store Memory block, and change the setting.

[John Carter]

Thanks for looking at this

a) You didn't read the second warning message? ...the one that contradicts the first one.

b) what setting?

[Fangjun Jiang]

They are not contradicting. These write-after-write and read-before-write could all happen during the same simulation step. You can change the setting to ignore them.

[John Carter]

a) The first error occurs in the first simulation step at t=0 (as it states) - and the second error occurs in the second simulation step at t=0.05. b) what setting?

[Fangjun Jiang]

The setting regarding how to report these data store memory access abnormally, either "use local settings", "disable all", "enable all as warnings" or "enable all as errors".

[John Carter]

Yes, should have said "where are the settings" I guess.

They are here

[John Carter]

That is a work around not a fix, though I'll be using it for now.