Hi Mari,
The problem is because LabVIEW respect the Regional Decimal Point as 'coma(,)' of your machine and Matlab always use the decimal point.
To disable this feature, you have two options: you can change your Regional Setting in Windows to use 'dot(.)' as decimal point instead of coma or you can change LabVIEW 7.1 to behave as Matlab. To do that, in the labVIEW Menu you can go to Tools>>Options and select "Front Panel". There is an option called "Use localized decimal point" that has to be unchecked if you want to just your dot.
Barp - Control, Simulation, RTT and HIL - National Instruments