MATLAB: Matlab simulink

simulink

I have established a library in simulink which has some blocks such as A,B,C,D and so on. In every block I have added a "toworkspace"before out(because I need every export data of every block ).When I creat a system use these blocks just one time,I can get what I want.But if a block appears more two times in this system ,the data will overwrite each other in workspace.How can I do? I don't want to modify its name( to workspace) in blocks every time to change. http://my.nuaa.edu.cn/data/attachment/album/201112/14/231419vh3ndsrh4htmm7ts.png

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The 'To Workspace' block will write to the MATLAB base workspace. Given multiple 'To Workspace' blocks with the same variable name, they will all write to the same variable in the base workspace in the same order as the Block Sorted Order.

There is no workaround to this using the 'To Workspace' block. The best option would be to turn on Signal Logging for the line whose signal you wish to log. The Simulink.DataLogs object that is created, retains each signal in a separate 'sub-object'.

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MATLAB: Does the ‘To Workspace’ block in an Iterator block log multiple values per time point

This is the expected behavior. All blocks in an iterator subsystem will be executed at each iteration point, so the 'To Workspace' block will log all points, even though time is not changing.

This explains why the vectors 'two' and 'four' workspace variables are of unequal lengths, eventhough they refer to the same signal. In particular, the length of the vector 'two' is greater than the length of vector 'four'.

In order to make both these signals of the same length, the vector 'two' can be modified as shown in the code below:

two.signals.values(find(~[diff(two.time); 1]))=[];
two.time(find(~[diff(two.time); 1]))=[];

This will ensure logging of a single value per time point.

However, there is no Sink block in SIMULINK that can achieve logging of a single value per time point automatically.

MATLAB: How to collect the results from a simulation for the model when I use the SIM command to run the model in Simulink 7.7 (R2011a)

The results from a simulation when using the SIM command are strored in an object of the class Simulink.Simulationoutputs.

In order to access these values, refer to the code below that can be used to access results from a simple simulation of a model with a 'To Workspace' block.

simOut = sim('vdp_ex', 'StopTime', '10');

workspace_struct = get(simOut, 'simout');

The 'workspace_struct' contains the fields of that are saved from the 'To Workspace' block. In order to access the values in this structure, I execute:

values = workspace_struct.signals.values;

Please execute the lines of code above agiainst the model that is attached to this solutionl.

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Related Solutions

MATLAB: Does the ‘To Workspace’ block in an Iterator block log multiple values per time point

MATLAB: How to collect the results from a simulation for the model when I use the SIM command to run the model in Simulink 7.7 (R2011a)

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