Convert TDMS (v2)

Import a TDMS v2 file as a matlab object (ob).

Description

Import a TDMS file as a matlab object (ob). This is based on the work by Brad Humphreys of ZIN Technologies (he supported v1 of TDMS). Only works on TDMS v1.2.

• Acknowledgements: This submission has inspired the following:; ConvertTDMS (v6)
• MATLAB release: MATLAB 7.7 (R2008b)

[Andres]

I did not test convertTDMS.m extensively, but I'll give it 5 stars as it worked with my files without any problem. Thanks, Grant!

[antonio Acampora]

 

[antonio Acampora]

it works well. I used over more than 6000 file and it goes well.

thanks for this important file :)

[Alex]

Seems to work a lot better than code provided by NI that requires its own rather large C library and has very limited set of datatypes!

[Grant Lohsen]

This file is about to face a major update so comments will be supported in imports. Just FYI to check back inside of ~1-2 months (when I get time to update it)

[Alex]

Still really appreciate this code!!!! Had some problems importing a cluster containing metadata stored as properties with no large sets of data attached. I'd love to submit a TDMS file for you but am unsure how in this forum.
1. Program has a few instances of:
'rawDataInThisSeg=0;'
which get get called with these zero data property entries. and therefore eliminate the array that should exist
replacing them with
'rawDataInThisSeg(obnum)=0;'
eliminates a failure at line 257, Index exceeds dimensions
and did not cause problems with rest of function.
2. Program assumed that there would be a lot of data attached and allocated a lot of memory to single value. I believe error had something to do with:
'estNumSeg=floor(filesize/(20+segLength)*1.2);' I hacked around this, making it equal to 1 for my special case, but surely there is correct method.

PS. Mathworks is currently posting the NI solution to this problem http://www.mathworks.com/support/solutions/en/data/1-2XFSRG/?solution=1-2XFSRG

Others may also wish to tell them how much better this solution is.

 --Alex.

[Mark Shore]

Seems to work well on TDMS v1.2, but halts with an error message for TDMS files v1.1 files:

Warning: This code is designed for version 4713 of the labview TDMS format.
You are attempting to import a file from version 4712 . Aborting Now

I've tested it on relatively large (300 MB) 16-channel files, but not multisession ones yet. Will hold off on a numerical rating for now.

[Grant Lohsen]

Mark,
The original file this is based off of (written by Brad Humphreys of ZIN Technologies) supported V1.0 of TDMS, mine supports V1.2. I haven't written one to support v1.1 and have not seen any documentation of the format (v1.2 has format specs online). I hard coded the version restriction so that it would only run on supported version (1.1 is 4712 and 1.2 is 4713).

I may add support for v1.1 in the future but it will be after i incorporate the upcoming v1.2 enhancements to speed and support of comment data.
-Grant

[Grant Lohsen]

I think the group functions may not be working properly. If you experience any problems with it let me know. I am trying to determine if there is an error in it.

[John]

I think this is a much better solution than the dll provided by NI. I've searched extensively and tried a few approaches and this is the closest I've found to a good solution so I really appreciate the work that has been done here. I am having problems getting it to fully work, though. I implemented fix 1 suggested by Alex above and added a few more hacks to get it to run without errors, but in the end none of the data is present in the output. I added a line to remove commas in the fixcharformatlab, and I also had to add a check after line 315 to continue the loop if cnt == 0. If you'd like I could send you my tdms file to help with debugging.

[Soraya]

Has somebody found a way to make it work with the v1.1 format ?
It seems that there are a lot of things to change.
Thanks

[Michael]

Is anybody going to take a stab at updating this to process TDMS v 2.0 files?

[Robert]

Version 7 of this function was posted 20 SEP 10 (File ID #28771)