Selection data from Discrete Root Mean Square simulink

Question

Emiliano Ascenzi 2020-5-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/525727-selection-data-from-discrete-root-mean-square-simulink

评论： Emiliano Ascenzi 2020-5-18

matlab2.mat

I have calculated the Discrete Root Mean Square of a signal in a sampling interval equal to the stopping time of the simulation. I used this block.

https://it.mathworks.com/help/sldo/ref/drms.html

I applyed the to workspace block, selecting array as save format, to see how the results are (attached). I need to select only the number different from zero, I tried to use the block Selector but I didn't reach the desired output

https://it.mathworks.com/help/simulink/slref/selector.html

Someone can tell me how to use Selector properly on a Discrete Root Mean Square block?

Thanks in advance

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Jyotsna Talluri 2020-5-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/525727-selection-data-from-discrete-root-mean-square-simulink#answer_433109

As you specified that your Discrete RMS Value block generates output [0;1.0977] ,make sure you set the Input port size of the selector block as 2 and as you want to get only second element which is not zero ,set the Index vector in the Index Option as [2].Set the Number of input dimensions as 1 and Index mode as one-based.

5 个评论
显示 3更早的评论隐藏 3更早的评论

Jyotsna Talluri 2020-5-18

Here,the issue is not with the selector block.As you set the sample time of discrete RMS Block and stop time of simulation to a certain same value,the values are computed at two time instants (t=0,t=sampletime) during simulation .To Workspace block logs the output at the each of these instants due to which you are obtaining two values.As you want only last final value as output, set the 'Limit data points to last' parameter in the 'To Workspace' block to 1 inodrder to log only final output of simlation.

Emiliano Ascenzi 2020-5-18