One sys multiple validation

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isabel
isabel 2024-4-23
评论： isabel 2024-4-28
Hello,
I'm trying to use the compare function to compare one sysid and three validation data. But Matlab always uses z_1 for validation. Why?
Another solution could be to plot sys, z_1,z_2, and z_3 in the same window, but I need to figure out how to do this because sys is an idpoly (structure) variable.
compare(sys,z_1,z_2,z_3)

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回答（1 个）

Tianyu
Tianyu 2024-4-24
Hi isabel,
https://www.mathworks.com/help/ident/ref/compare.html
compare always uses one dataset for validation. It is used to compare the performance of different models with respect to the same validation set.
compare(data, sys1, sys2, sys3)
If you want to check the performance for different data sets:
compare(z1, sys)
compare(z2, sys)
compare(z3, sys)
If you want to plot all data in one figure, you can simulate the trajectory first:
y = sim(sys,data);
plot(y.OutputData)
hold on
plot(z1.OutputData)
plot(z2.OutputData)
plot(z3.OutputData)
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Tianyu
Tianyu 2024-4-25
compare function cannot be directly used for your purpose.
You need to customize your plot using the last workflow I provided.
To get fit information:
[~,fit] = compare(z1,sys)
Then you can plot all validation sets and add information using legend function.
https://www.mathworks.com/help/matlab/ref/legend.html
isabel
isabel 2024-4-28
Thank you! That was very helpful!

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