Loading / importing *.lvm file in matlab

Dear all,

Thanks for a great help site. I'm trying to load a *.lvm file like this short 4KB example http://dl.dropbox.com/u/12840152/test18xy.lvm pretty standard 2011 *.lvm file I guess.

Tried out a couple of things myself, e.g.:

I) When I use the v1.2 lvm_import file as uploaded by "M. A. Hopcroft" as it is I get the same error as "Vepashka" as "Error in ==> lvm_import at 357 data.(fieldnm).Comment = rawdata{numdatacols+2}{1};"

II) When I comment out the "consolidate into a simple array" part starting at line 349 and just keep the line 349 "data.data=rawdata" then I am able to complete the import. The only trouble with method II) is that my data.data struct is empty!

I've loaded ascii *.txt files in matlab before so I don't know why this is causing me so much grief. Any help would be much appreciated as I'm struggling with my master thesis

Thanks, Kenneth Rasmussen

[Kenneth]

As you can see from the example *.lvm file, the data should be pretty straight forward to load into matlab as it is in this case just 1 time column + 6 data columns, tab separated and comma decimal_separated. I think what is really putting me of is the header info that has another number of columns than the the data/time. Any help is much appreciated guys, sincerely Kenneth

[Ashish Uthama]

http://www.mathworks.com/help/techdoc/ref/textscan.html with 'HeaderLines' ?

[Kenneth]

Dear Ashish Uthama, thanks for the swift reply, I tried this:

fid = fopen('test18xy.lvm');

C = textscan(fid, 'HeaderLines', '25');

fclose(fid);

But where I would expect my data to be, C returns an empty struct, weird

Sincerely,

Kenny

[bym]

C = textscan(fid, 'HeaderLines', 25) <-- do not put the 25 in quotes

Answer 1

[Fangjun Jiang]

Try this: http://www.mathworks.com/matlabcentral/fileexchange/19913-lvm-file-import

[Kenneth]

Dear Fangjun Jiang, thanks for the swift reply, but I had already tried this way as evident from my post, cheers /Kenny

[Fangjun Jiang]

In your .lvm file, the decimal separator is ',', instead of the usual '.'. Is it possible for you to change that at the Labview end? I don't see lvm_import.m handles ',' as decimal separator.

It won't be hard to import your data file. But it's not that easy to write a utility that can inport a general .lvm file. Try to contact the author to see if the lvm_import.m can be upgraded. I think you found a valid defect of the utility.

[Fangjun Jiang]

Indeed, if I replace all the ',' in the 30x7 data array with '.', lvm_import worked and the data was successfully imported into a structure. Try it your self. You can use meditor to find-and-replace all the ',' in the data.