LVM file import

Imports LabView .lvm data files into MATLAB

Description

National Instruments LabView software has a native file format called LabView Measurement File (LVM, extension .lvm). This m-file, lvm_import.m, reads LVM files and imports the data into the MATLAB workspace.
LVM is an ascii text file format, and the data can be imported into MATLAB using the built-in import.m function. However, import.m has some limitations: it cannot handle multi-part LVM files, and it does not return the contents of the file and section headers. lvm_import.m handles all types of LVM files, and returns specific information such as date, time, data column names, etc.

• MATLAB release: MATLAB 7.1.0 (R14SP3)

[Sung Jin Kim]

very good

[Gerald Knebl]

excellent programmed with good performance.
What I like to suggest is to make it compatible with multi x files as well.
really good work

[Vepashka]

Sir im trying to import lvm file into matlab using ur lvm_import.m,that was acquired from some sensors.Im running the program but in each run i face with this problem.
"??? Index exceeds matrix dimensions.

Error in ==> lvm_import at 357
    data.(fieldnm).Comment = rawdata{numdatacols+2}{1};"
What am i gonno do??Need a help,plsss!

[Farzad Rafieian]

Hi,

Thanks for the file, but for my data it came up with the follwoing error message :

>> lvm_import('Data07v2.LVM');

Importing Data07v2.LVM:

??? Index exceeds matrix dimensions.

Error in ==> lvm_import at 164
        val = v_in{1}{1};

Can you help me in this regard ?

[Farzad Rafieian]

Hi,

Thanks for the file, but for my data it came up with the follwoing error message :

>> lvm_import('Data07v2.LVM');

Importing Data07v2.LVM:

??? Index exceeds matrix dimensions.

Error in ==> lvm_import at 164
        val = v_in{1}{1};

Can you help me in this regard ?

[Farzad Rafieian]

To inform any future reference to this page, the updated file on 15 Apr 2010 worked fine with my problem mentioned above.

[Jo]

Two bugs in the code that prevent it from working(possibly more) with some lvm files.

one is mulitple tabs. Changed line 178 to
        v_in = textscan(linein,'%*s %s','delimiter','\t','whitespace','','MultipleDelimsAsOne', 1);

second is muliple lines: there is a check at line 237 for a single extra line but it should be more general skipping over all extra blank lines
---
for example, in my lvm the data had two tab's and two extra blank lines after the first header.
while (isempty(linein))
if (feof(fid)), return; end;
linein=fgetl(fid);
end;

[M. A. Hopcroft]

Note: the latest version (v1.2) uses the suggestions from Jo (13Jul2010), related to "Special" headers in the LVM file.

[Kenneth]

Dear all,

Thanks for a great *.m file. I'm having a bit of trouble though, 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.

I) When I use the v1.2 lvm_import file as it is I get the same error as "Vepashka" above 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! Any help would be much appreciated as I'm struggling with my master thesis

Thanks,
Kenneth Rasmussen

[M. A. Hopcroft]

Several people have reported problems where data cannot be imported. This may be related to LVM files that use a comma as a decimal separator instead of a period. This has been fixed in the latest version of lvm_import (and also in the NI LVM software).