Data is not valid NDGRID format

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Manh Nguyen 2021-6-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/846815-data-is-not-valid-ndgrid-format

评论： Manh Nguyen 2021-6-9

采纳的回答： Walter Roberson

Data.zip

在 MATLAB Online 中打开

Hi Matlab Community,

I'm a new user of Matlab program. I got the error when I used the griddedInterpolant function to interpolate the data, this error is displayed in the below.

In addition, I also attach my controlling script in this post.

Please help me to resolve this problem!

Any suggestions will be appreciated.

Thanks all,

Bests,

Manh,

Error using griddedInterpolant
Data is not valid NDGRID format
Error in
FCr = griddedInterpolant(daplon,fliplr(daplat),fliplr(hs),method); 

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Scott MacKenzie 2021-6-4

Please re-read my comment. Posting "all your material" burdens anyone trying to help you with downloading, unzipping, importing multiple files, etc. I suggest you figure out a way to distill the issue down to something more manageable. It's usually best just to post a single spreadsheet or text data file and some code that accesses that data and demonstrates the issue you are trying to resolve.

Manh Nguyen 2021-6-4

在 MATLAB Online 中打开

sample.m

Hi Mr. Scott MacKenzie,

I've changed my script into one file which is attached in this post. And the error in my case is displayed like that:

>> run sample.m
xl =
   80.3980
xr =
  155.4010
yb =
  -11.7401
yt =
   33.5703
getting hs tp and dp for 20200601.0000
Error using griddedInterpolant
Data is not valid NDGRID format.
Error in sample (line 50)
  FCr = griddedInterpolant(daplon,fliplr(daplat),fliplr(hs),method);
Error in run (line 86)
evalin('caller', [script ';']);

Can you kindly help me to resolve this problem?

Thank you very much!

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采纳的回答

Walter Roberson 2021-6-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/846815-data-is-not-valid-ndgrid-format#answer_716590

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FCr = griddedInterpolant(daplon,fliplr(daplat),fliplr(hs),method);

gives you that problem, then the first thing to try is

FCr = griddedInterpolant(daplon.',fliplr(daplat).',fliplr(hs).',method);

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Walter Roberson 2021-6-4

There were a couple of problems with the code.

The way that the code forms the grids of latitude and longitude were incorrect. That was causing the error message you were seeing about ndgrid.

But after I corrected that, I started getting error messages such as

Error using matlab.internal.imagesci.netcdflib

The NetCDF library encountered an error during execution of 'open' function - 'Malformed or inaccessible DAP DDS (NC_EDDS)'. If the data source was an OPeNDAP URL, see the OPeNDAP

Troubleshooting section in the Users Guide.

At first it looked like the problem was occuring at the 8th time, but when I tried to investigate with debugging, the problem would go away for that time, and show up for a different time. I added in test code to retry upon failure, but that code turned out not to be enough.

At some point I realized that the difference between the program trying and me succeeding every time I tried to debug the problem, was a matter of timing: with me recalling the commands and thinking about the result, each of the ncread requests I was making was delayed relative to successive automatic tries.

I tried putting in a 2 second delay between tries, but that turned out not to be enough. I currently have it executing with a 10 second delay between tries, and that is working so far.

I suspect that the remote server is rate-limiting attempts to fetch data.

The proper correction is not to put in a delay between reads, like I did. The proper correction is to read the data for all of the time periods at the same time. It looks to me as if the processing for the time periods could be vectorized, but even if not, it should be easy to read all the data at the same time but then process one time period.

If my modified program succeeds with the 10 second delay, then I will post that version of the code, in order to permit you to get somewhere... but really it needs to be rewritten, which is something I expect would make the code much faster than my version that has the 10 second delay (with 129 time periods, 10 second delay requires over 20 minutes to read the data. I think the program could be much faster than that if it were rewritten.)

Walter Roberson 2021-6-8

Adjusted versions of the files are attached.

Note the new function, read_with_retry . That is called by readww3_2TPAR2 in order to read each different variable more reliably.

This code has not been rewritten to try to read multipe timepoints at the same time. The guiding principle was "get it to work first!"

Manh Nguyen 2021-6-9

Hi Roberson,

Thank you very much for your help.

I've downloaded and run your modified scripts and they can run successfully.

I'd like to say that I'm really appreciate your help.

Thank you again.

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