Trying to write current aquired data to file while a continuous aquisition is occurring.
I have a vi named pj_pushbutton.vi in the attached library. The vi is aquiring data continuously. I have a button that when pushed will write the data to the file. It does this fine except that it seems to be writing the samples from the buffer immediately. I guess I want to aquire the latest samples not all the samples that are n the buffer so that I get the real time aquisition. When I push the button I have it set up to read the number of samples based on time on the front panel. I want to sample 2 seconds and it calculated the sample rate multiplies by the seconds to give me the number of samples. When I run the program the push the button to write the data to the file
it seems to be writing from all the recodes in the buffer not just the most current. So instead of taking 2 seconds to write the data it writes whatever is in the buffer immediately. How do I keep it from doing this? My file is attached in a zip. Thanks for your help.
Attachments:
filebutton.zip 719 KB
Hi HAL,
I don't have time to figure out exactly what you are asking but I can offer this tid-bit that may be handy to know.
"Delete from array" will by default return the last eelement in an array. This is ewasier and cleaner than iterating through all the elements and just keeping the last.
Add some comments (fre labels) showing me where to look if you want me to be of more help.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
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Help!! Trying to writing an array to a file without having to rewrite the old data every time.
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I have a vi that takes a 2D array and writes it to an xml file. The purpose for this is to characterize the pathloss through a dowkey 10x10 matrix at varies frequencies. I use this program to create a look-up table for the switch matrix so when I conduct one of my automated tests I can obtain an accurate measurment. The problem with this is I am taking about 299 data points per switch matrix combination leading me to over 32000 data points in the look-up table. The reason I use xml is because each data point needs a header so I can parse through the look-up table with another one of my vi's when I need that pathloss. What I am trying to fix is that when my vi writes to a file it writes one array at a time to save memory space. When it writes it rewrites the old data then the new data. As the number of data points increase so does the lag time to write to the file. By the time I am done it takes about five hours to fully write to the file. Does anyone know of a way to write continuesly write to a file without having to rewrite all of the old data? Attached is my vi for writing to the file, my vi for searching through the file, and an example of one of my look-up tables.
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Go to Solution.
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