Error using the tdmsinfo() function

In my project I need to open and process TDMS files (from LabView) with Matlab (R2022a). Therefore I want to use the new functions from the Data Acquisition Tool Box. But at the very start I get error messages which I do not understand. The code is very short and looks like this:

clc
clear all
fileName = "OR_measurement_1.tdms";
info = tdmsinfo(fileName);

When I try to run the code I get this error message:

Error using TDMS_to_Mat

Channel Group Property name does not exist.

This also happens when I use 'tdmsread(fileName)'.

I just want to access the data and process it.

How can I solve this problem?

[Stephen Price]

Hi Gregor, I am experiencing the same issue for TDMS files output by LabView 2017, but it runs fine for files from LabView 2019 for me. Out of curiousity, what version of LabView are you using?

[Gregor Schlaucher]

Hi Stephen,

I used LabView 2020. Anyway I solved the problem with a colleague. It turned out that these MatLab commands (tdmsread, tdmsinfo) expect that all groups have a real name. If you don't name your groups, they are 'untitled', which MatLab doesn't like. When I renamed the groups to 'GroupName' the commands worked perfectly.

Answer 1

[Gregor Schlaucher]

It turned out that these MatLab commands (tdmsread, tdmsinfo) expect that all groups have a real name. If you don't name your groups, they are 'untitled', which MatLab doesn't like. When I renamed the groups to 'GroupName' the commands worked perfectly.

[Brianna Miranda]

What are the groups and how do you rename them?

[Gregor Schlaucher]

There is a group which contains several channels for the time stamp and channels for force values and torque values (calibrated and saved in N and Nm).

I used a Labview program which automatically names the group 'Group 1'. And the new Labview program gives names to all the groups and channels when the files are created.

[Daniel]

I'm running into the same issue. I'm using Labview's DAQ Assistant and writting the data to a TDMS file.

When I try and open the tdms file in matlab I get the same error:

"Channel Group Property name does not exist."

When I open the tdms file in excel viewer. I see the Group has a name "Temperatrue"

and the Group has 1 channel,

Channel: "Amplitude"

I can't find what matlab is having issues with.

Can you elaborate on how you fixed the problem?