Writing data to binary file byte issue

[arob]

I am attempting to write a 22 channel array to a binary file. Each single-precision number in the array should be 4 bytes, so after writing to the file, I expect it to be 88 bytes in size. However, when writing the whole array to the file, it comes out to 92 bytes. I am not sure where the extra 4 bytes are coming from.

When I index the array and write each data point separately, it gives me the result I want (88 bytes). Ideally, I would like to be able to write the whole array rather than each point. Any idea what is going on here? 

[Kyle97330 · Accepted solution]

If you're writing an array, then it's probably adding in a header for the array that specifies the size.  Check the first 4 bytes, it probably decodes to 22 and then the rest of the data matches your data exactly.

[arob]

Yup, i was missing a false on the "prepend array or string size?" input for the write to binary file function