Length mismatch

[Martin Merkl]

I get the following error when trying to load .op2 generated by Femap with NX Nastran:

ValueError: Length mismatch: Expected axis has 1000 elements, new values have 1 elements

This is from a simple test model from the frequency response analysis (just a plate loaded with a unit acceleration). I use pyNastran extensively for "real" projects and never experienced this error. This error is produced when build_dataframe is set to True

model.read_op2(op2_file, build_dataframe=True)

What can be wrong with the op2 file? 

[steve]

If I had to guess you're using SORT2. It's supported, but there's lots of results. SORT1 is supported much better in both pyNastran and Femap.

Beyond that, I'd have to see an example.

[Martin Merkl]

Hi Steve - thanks for the reply and the suggestion - I've checked and I'm using SORT1. The only thing that I changed from my usual workflow is that I'm using the newest Femap 2406. But I tried running the same .dat in the older version that I use regularly (2022.1) and I get the same error.

I attached the .dat if you want to take a look at it.

Dne čtvrtek 4. července 2024 v 8:24:19 UTC+2 uživatel steve napsal:

[Steven Doyle]

Martin,

I don’t have access to Nastran outside work, so I need the op2 and the associated f06 data PRINT’d to the f06.

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[Martin Merkl]

Hi Steve,

here are the files if you find the time/will.

Dne čtvrtek 4. července 2024 v 15:43:52 UTC+2 uživatel steve napsal:

[Martin Merkl]

Looks like the issue was resolved by updating pyNastran to the latest version.

Thanks.

Dne pondělí 15. července 2024 v 8:59:34 UTC+2 uživatel Martin Merkl napsal:

[Steven Doyle]

Those are the best kind of errors!

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