Using 2D array in 'From workspace' block in simulink

Hello,

I have a simulink model that gets it's input data from 'from workspace' block, I have the data parameter in this block setting to [time data], where time is M by 1 and data is M by N array. Everything is working and the output is as expected.

Now I want to use a 2D array so I changed data from M by N to M by N by Z but I'm getting the following error :

• Dimensions of arrays being concatenated are not consistent.

The idea is for each time(i) the simulink model handle a 2D array of data(i,:,:). Not sure if this makes sense !

Would really appreciate it if any one here can give me some feedback and mybe tell me what I'm doing wrong here ?

Thank you

Answer 1

[Fangjun Jiang]

Click "Help" button on the dialog of the "From Workspace" block, open the example model for "Read 2-D Signals in Structure Format From Workspace"

[Fangjun Jiang]

Use this set of data, set the simulation to be discrete, step size to be 1.

Set stop time to be 1, run simulation, see the Display. Then, set the stop time to be 2, simulate again.

time = (0:2)';
M =  ones(4,5,length(time));
M(:,:,2)=M(:,:,2)+1.1;
M(:,:,3)=M(:,:,3)+2.2;

datastruct.time = time;
datastruct.signals.values = M;
datastruct.signals.dimensions = size(M,[1,2]);

[Chaabane]

thank you for the update, but unfortunetly I need to run it automatically for huge set of data so this won't work in my case!

[Fangjun Jiang]

This is just an illustration on how you suppose to contruct your data. At each time(i), the "From Workspace" will read in a 2D array of data(:,:,i).

Answer 2

[Chaabane]

Thank you for your answer, I have already tried this example but for me, it is very confusing how this works on Simulink!

If I use the following code

time = (1:50)';
data =  zeros(50,8);

and add it to the 'from workspace' block as a vector [time data]

The output size is 8 bytes. So simulink go throught time and uses the data that corresponds to that time.

But if I use structure like the example (see my code below), it seems that all the data in datastruct is used at once which is not something practical in my case.

time = (1:50)';
data =  zeros(50,8);


M = repmat(data,[1 1 length(time)]);
datastruct.time = time;
datastruct.signals.values = M;
datastruct.signals.dimensions = size(data);

[Fangjun Jiang]

See my update.