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I'm going to assume you want to change the dynamic data values in memory after reading the dyr file?

Under the "Dynamic Simulation Operation" there's "changecon", "changeicon" etc. method that allow you to change values if you know the array index value of the value you want to change.

In order to find the indexes, use the "mind"-ending functions e.g. windmind for wind models.

PS. If you want to read the values, use "Single Element Data" section's "dsrval", "dsival" etc.