Reading an ascii file as floats

Jun 17, 2013 at 11:42am

Reading an ascii file as floats

This sounds like it should be simple, but I’ve just started with Max (1 day in) and I can’t figure it out. Any hints would be appreciated!!

The file I want to import looks like this…

0 -0.07
0.087861806 -0.017723613
0.175723613 -0.387255298
0.263585419 -0.478504518
0.351447225 -0.089813656

Two columns, 2758 rows, ascii file. I can import the file using jit.textfile, but the result is just the ascii numbers that represent each individual character. I need to end up with a 2 x 2758 matrix of floats. Do I need to explicitly parse each character and build my own float numbers?

Jun 17, 2013 at 2:27pm

Use the [text] object instead, and parse the file using the “line” message (use “query” to determine the number of lines). That can then go into [unpack f f] if you want to separate the two floats on each line, and then into float numberboxes to see them. Note that you may see some rounding, but I believe (?) that internally the values are the same as those from the file.

To build a jit.matrix of these floats, you’d need to use a “setcell” message for each. Should be plenty fast if you parse through the file with [uzi]. If you just need the data to grab here and there (and don’t need to see it in a matrix or do any jit.ops on it), you can just leave it in [text] and access it as needed. Transferring to [coll] is also very easy, just use the index from [uzi] to set the line number.

Should be plenty of options there to get you going ;)

Jun 17, 2013 at 3:37pm

Thanks for the suggestions! Since checking in to the forum last time, I found a solution to my problem by massaging the formatting of my datafile outside of max and importing directly to coll. I do appreciate you taking the time to respond!

Jun 17, 2013 at 3:50pm

Sounds good, sometimes it’s easier to have more usable data to begin with. Best of luck with your project and welcome to Max…careful, it’s rather addictive…!


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