Xpc target data logging at different rate

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Jan De Vries
Jan De Vries 2012-10-20
My xpc model rund at 100Hz. I want to log several data for a week non stop. However, the data doesn't need to be logged every 0.01s, only every 1s.
How can I log data at a different rate than my simulation steptime? And is it possible to log so many datapoints?
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Gordon Weast
Gordon Weast 2012-10-31
Jan,
I believe that using the 'Decimation' parameter in a file scope should allow you to save a subset. In your case, set Decimation to 100 to log every 100th time step.
Gordon Weast, xPC Target Development

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回答（1 个）

Ryan G
Ryan G 2012-10-23
Eventually I would suspect the system will run out of memory for one reason or another. However, you can use a file scope to log the data to a file on the host machine. See xpc data logging on the file exchange.
You can use a rate transition so that the data going to that scope is at 1hz instead of 100hz.
I would make sure as little as possible gets logged in memory since a week is a very long time for a sim in my opinion. Good Luck.
  2 个评论
Jan De Vries
Jan De Vries 2012-10-23
Thanks, Ryan. Doesn't a rate transition just hold values until next simulation step resulting in the same number of datapoints?
Ryan G
Ryan G 2012-10-23
It will repeat the values if you set it at a faster rate. If you set it for a slower rate, as you desire here, it will only pass through the value at the 1Hz rate. Go ahead and try it out in Simulink first to verify, but I know it will work as you desire.

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