Hello, I use the Labview 8.2.1 and I create a diagram in my program. The plot that is created isn't as accurate as the data of the *.txt file. The data are in 2 columns, the left corresponds to x-axis and the right to y-axis. Here is a sample of the data: 0-9310.2-9200.4-9100.6-9020.8-8951-8921.2-8881.4-884 1.6-8821.8-8822-882 And here is an abstract of the diagram that corresponds to these data. As we can see the the y-values 931, 920, 910, 902, 895 that correspond the the x-values 0, 0.2, 0.4, 0.6, 0.8 are plotted to the same x-value 0. The rest values are plotted in the same way, that is, the y-values that correspond to floating x-values, are not plotted to the corresponding floating x-values but they correspond to the most significant digit of the floating number. I tried to solve this problem by changing to 1 the Precision Digits in the "Format and Precision" menu of the "Waveform Diagram" but the result is only in the appearance of the x-scale and not in the resolution of the plot. What do I miss? Hope I have been understood. Waiting for an idea. Thank you in advance.

You are reading the data as integers, so you lose all the fractional parts. Go to the diagram and select Double as the datatype for the Read from Spreadsheet File VI. Lynn

LabVIEW

high scale-density plot

Solved!

I think the comma and dot notation are set by the OS. LV has an option to Use Localized Decimal Point. Look at the help and try the different settings to see if this does what you want.

Lynn