Specifying discrete sample time for variable-size signals
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Hi, I am trying to use the inherit sample time setting (-1) for the Assignment block, using a variable-size signal as an index vector coming from an external source. I have selected the following options for the model:
Solver Type: Fixed Step Solver: discrete (no continuous states) Start time: 0.0 Stop Time: Inf Fixed-step size (fundamental sample time): 0.001s
When I try to update the model, I get the following error
The signal at input port 3 of '.../Assignment1' is a variable-size signal with a nondiscrete sample time. The sample time for any variable-size signal must be discrete
Even though I have specified this in the simulation configuration parameters section, why am I still getting this error message? The message goes away if I explicitly specify the sample time as 0.001 instead of -1. Any help would be greatly appreciated.
Running MATLAB R2010bSP1 on Windows XP SP3 (32-bit)
Thanks, Sundeep.
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Kaustubha Govind
2012-2-13
As TAB indicates in his/her comment, it is likely that the input signal has a continuous sample time. The Assignment block inherits that sample time (-1 means inherited sample time). The solver configuration does not affect the fact that your signal is continuous.
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Kaustubha Govind
2012-2-14
If all sources specify -1 as sample-time, then I think it should indeed use the solver step-size as the sample-rate. Could you try turning on Format->Sample Time Colors. Then observe if there are any blocks with continuous sample time (black lines).
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