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Everything posted by hhtnwpu

  1. do FFT analysis with large data , I found there are more than one choice in the function panel in labview ,in signal process or signal express,S&V tool box. the function in signal process can process more data than others,how can i process more data (more than 10000000 rows)?
  2. Thank you for your suggestion. as your opinoin, how can I plot all the data ,if the amount of data is very large , the memory still have a problem of "memory is full or memory is out"
  3. thanks a lot. I will have a try about SQlite. I think my data file is text format. Using the SQlite,when polt a graph of total time, whether there will have a problem about "out of memory" or "the memory is full"? thank you very much, as your advice ,i can avoid using database, really? how about very large data .as I know,when the file size is more than 50MB,there will be a "memory is full"problem.
  4. thanks for your advice. but the sqlite can't run when the version is below labview 2009.besides, how about the HDF5?if the sqlite is easier than HDF5? thank you for your suggestion. How can i convert the text file to binary file? i just know the data original format is HEX with muliti-columns. thanks. if the sqlite will influence make a .exe installer?
  5. hi, I want to read and process large data(nearly 100 million rows,the file size over 500MB), the original format of the file is .txt, through rename as .dat we get the binary file. The attachment is my vi. When the file is larger than 1 million lines(the data is singal Column), there is a wrong with "the memory is full".I want to read the data and plot a graph in the time domain, on the graph I can see the detail by zoom tools; and then do some anlysis about FFT and Statistics .I don't know how to do decimation in chunks .another thing ,maybe the memory release is also important. can you help me? thanks! the data from a dynamic strain test,the sampling rate is 10K/s。if we can get the whole result use a little data decimation from a chunk ,when we zoom some detail, such as in one chunk, we can get the whole data on the graph without decimation?thanks! read data.vi
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