data reading and writing problem? how to set " Read from Measurment File express.vi" 's readout datasize?

[IgG]

Dear all,

I want to use Labview to process a data.
Now I have a array in a text file.
this array is very very big. which is at least row*col = 6 * 100000;
the column size always 6,
but the row size is ramdom, some times is very big, like bigger than 65535,

when I use "read from measurement file express.vi" to read this file, the array I could get always 6*5339, I don't know why. the column size is always 5339.
and then I delete the 1st row of the array and then write into a txt file via "write measurement file express. vi", it takes a very long time. almost computer has no response. after a while, no file was creat to record the data.

is there an efficient way to process such big data file and store the processed file into a new file

thank you very much

Jack

Message Edited by weichengatech on 03-09-2006 12:00 AM

[Travis_M.]

Hello,

There’s no real efficient way to read the file if you don’t know exactly how many rows of data you have.  Your going to just have to read a row at a time and add the results to the end of an array (granted for the clever programmers there are some more efficient ways to do this than just with ‘build array’).  I would start by asking you how much information you know about the file and what the exact structure of it is (i.e. is it a binary file, a tab delimited file, or a LVM file)?  Could you provide a screenshot of the code you are running? If you provide a little more information on the file structure we might be able to contribute some additional information.

Look forward to hearing back from you-

[IgG]

thank you , man
I got some answer from my friend. using read from spreadsheet.vi, it is more convinience.

thank you  all the same

Jack