Evaluate boolean expression stored in a string
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twols, in LabVIEW General
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By Porter
View File LV muParser
LV-muParser provides a simple LabVIEW API for muParser fast math expression parser.
A modified version of muParser v2.2.5 is included. It will be installed to your "<LabVIEW>\resource" directory. I have added support for the "!" (not) operator as well as added ":" as a valid character for variable names.
You will find the muParser API in the functions palette under "Addons > LAVA > muParser"
muParser: http://beltoforion.de/article.php?a=muparser
LV-muParser source on github: https://github.com/rfporter/LV-muParser
Submitter Porter Submitted 08/25/2017 Category General LabVIEW Version 2015 License Type BSD (Most common)
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By Aishwarya Saravanan
My project involves designing a front end for a synchronous generator using LabVIEW. It is actually data acquisition and display of signals in a file. The problem I face when building a program is that: 1)the sampling rate is set to 100 samples with 1 kHz sampling frequency.These signals are generated by daq assistant and i have used merge signals to merge these signals from daq assistant as well as signals from other radio buttons and Boolean as well. The problem is that when written on a file I am able to see only one instance of Boolean status for every 100 samples daq assistant creates. 2) now iam able to write only 0/1 as status of Boolean in the file.How will I write on /off into file?
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By Porter
LV-muParser provides a simple LabVIEW API for muParser fast math expression parser.
A modified version of muParser v2.2.5 is included. It will be installed to your "<LabVIEW>\resource" directory. I have added support for the "!" (not) operator as well as added ":" as a valid character for variable names.
You will find the muParser API in the functions palette under "Addons > LAVA > muParser"
muParser: http://beltoforion.de/article.php?a=muparser
LV-muParser source on github: https://github.com/rfporter/LV-muParser
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By Randy_S
Good morning,
I have a DLL I created (in Labview) that takes in string information, does some magic crunching on it to create a password that is passed out as a string. This DLL will be called from CVI and probably from a C# application.
This should be so simple, however I cannot figure out how to pass the string in and get the modified string out of my DLL.
I've had no luck at all getting this DLL to work by trying many different things. It crashes LV, returns and error, or simply passes nothing out during my trials.
I've included the project (its small) in zipped format. Can one of you kind souls take a look at my code and tell me what I'm doing wrong, or what I need to do correctly to both, configure the DLL and then call it from LabVIEW?
Thank you!
Randy
Password Generator.7z
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By pkeny
Hey all,
I am trying to create a fairly large program.
What I want to do is for someone to upload a text file, customized so I can create statements for it, and then labVIEW will read the the text file and perform actions.
Specifically, the text will contain pin numbers, on/off status, wait delay, and another on/off status. The pin numbers correspond to a Boolean indicator array. The on/off status tell the Boolean indicator array to turn on/off. The wait delay tells the program to wait how long before changing the indicator array value again, and the second on/off status turns the Boolean array on/off after the wait delay.
I cannot get the part where I want the Boolean array to change status after the wait delay. I am thinking the method of doing this would be a local variable, or a property value node. But, when I tried it, it would not even let the original status to turn on/off the indicator Boolean array, let alone changing the status after the wait delay.
I have attached my code and text file (tab delimited) for another method of explanation.
Altenbach wrote a big portion of the code for educational purposes
If you delete the local variable, you will notice that the boolean array changes based on the first text column, versus it being constantly Gray if you have the local variable.
ExcelTest.txt
Text Boolean.vi
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