MATLAB: In Simulink, is it possible to send data to workspace in real-time using the ‘ToWorkspace’ block

MATLABreal timesimulinktoworkspace

Hello everyone,

I have a large simulink model. In this model I calculate certain variables that are essentially [1×1] constants. For example, I analyze an electrocardiogram recording to count the number of heart cycles: num_cycles.

I would then like to use such constants like num_cycles in various other blocks like selectors and Matlab function blocks to fix the size of various variable size signals.

Now, if such constants would be defined in the workspace, I could just type num_cycles or whatever in the Simulink selector block, or in the output size of the Matlab Function's explorer. I have tried using the block "ToWorkspace" to do this. However, this block only sends data to workspace once the simulation in stopped or paused.

My question is: is there any way to send variables to the workspace immediately so that they can be accessed by future blocks as if they were workspace variables?

Thank you,

Rafael

Best Answer

Use a data store. https://www.mathworks.com/help/simulink/ug/model-global-data-using-data-stores.html

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MATLAB: From Workspace block using Data Dictionary

I figured it out, or at least I figured out why it's not working with a From Workspace block. I'm using Simulink Release 2016b, and the ability to use a From Workspace block with a model that uses a data dictionary was added in Release 2017a.

See 2017a release notes for details:

https://www.mathworks.com/help/releases/R2017a/simulink/release-notes.html

MATLAB: How to create a single square wave of variable duty cycle and length.

From my assumption, you are trying to generate a square wave which looks like in the below image, when length_of_wave is 100, num_cycle is 10 and dutycycle is 0.75

In this case your code throws an error because the value of duty_cycle * length_of_wave/num_cycle is not an integer and you are trying to pass this non-integer value to "zeros" function. Hence the error.

You can make use of the following piece of code

function waveform = squareWave(length_of_wave, num_cycle, duty_cycle)
oneCycleLength =  length_of_wave/num_cycle;
t=1:oneCycleLength;
oneCycle(t)=0;
oneCycle(oneCycleLength*duty_cycle+1:end) =  1;
waveform = repmat(oneCycle, [1,num_cycle]);
plot(waveform)
end

In the above code, you have to handle the case when length_of_wave = num_cycle

Best Answer

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MATLAB: From Workspace block using Data Dictionary

MATLAB: How to create a single square wave of variable duty cycle and length.

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