How read just a part of a binary file?

[madness]

johnsold, please find the vi to read the datas...

[johnsold]

Try this. It reads the entire file and extracts one sub array in 30 seconds. If you only want to read part of the file at a time, change the number of rows to the size of the segment you wish to read. You will also need to track and update the offset if you read the file in segments

Lynn

[johnsold]

I also noticed that the test file did not have the correct number of bytes to have 6 columns of SGL. Number of bytes in file: 10918336. This is not divisible by 6.

Lynn

[madness]

Johnsold.

...
For the size of the datas, I think that the data contains the header that deffine the datas...
The I'm sure that there is 6 chanels, but if I remember well, I have 6 chanels...
(I'll made an other file with a fixed number of chanels and test it to see...)

When you say that I have to "track and update the offset if you read the file in segments", How can I do that?
Reading in segment is it the same thing than reading just a part of a file???
I dont understand how you can read a part of a file without a loop....

Rrgards

[madness]

Forget the previous post, I have found how to do...

Last question : in the comments of the vi, you say that the "Number of outputs must be equal to or less than number of columns in data" : Why? It's just the number of columns that I take : it's equal to taking a columm on 5...

[johnsold]

The Decimate 1D array function produces no output until there are enough elements in the input array to fill each output array at least once. Try this little test VI with one, two, or three elements in array. No output. Try 9 elements. Each output array has two elements, but the ninth input element does not apppear at the output.

Lynn