Plotting Time Stamp from Txt file in Column to another column

[Jaxon]

I want to know how to plot 2 columns that i am reading from a text file.

column 1 has a time stamp in HH:MM:SS,  and column 5 has data in which i want to plot the time verus the data.

[Andy_C.]

Read the txt file, convert into 2D-array, then use Index Array to pick out particular column of interest. Lastly, use buid array and waveform chart to plot your data

[Jaxon]

i have sepearted the columns that i want to get a graph of. The time column and the data column are both in 1d string array.

 so when i use the build array function they become a 2d string array and i am not able to connect this to

a waveform chart.

i can convert the data string into a number, but how do i convert Time string (HH:MM:SS) into a number format for plotting time and data read from text file

[JÞB]

Here's a snippet with a HH:MM:SS string converted to Seconds, Time of day, and a Time record.  Which format did you want?

[Jaxon]

I am not able to connect the time to the mattch pattern since the time is in 2d array.

10:00:00       0.65

10:05:02       0.65

This is what my txt file that i am ready looks like, but with more columns.

I want to take column 1 which is time in an array and column 2 which is also in an array and plot.

[JÞB]

Use the index array function to get a column or a row from a 2d array <Check the help for index array>

Oh-  Edit- You will need to put the conversion inside a loop and operate on each time string element

Message Edited by Jeff Bohrer on 03-18-2010 12:12 PM

[Jaxon]

i was able to get the time from column 1 into an index array, but i do not understand how to create the while loop.

do you have an example.

[JÞB]

You are really new to LabVIEW aren't you?

Have you tried any of the getting started excercizes yet?

Message Edited by Jeff Bohrer on 03-18-2010 03:30 PM

[DFGray]

The Scan from String function will do most of those conversions in a single step.  Here are a couple of examples.  You will still need to read the array of strings in and process in a loop.

Message Edited by DFGray on 03-19-2010 07:46 AM