Re: Including NaNs in a data file?

[Doug Stewart]

On Wed, Nov 5, 2014 at 7:55 AM, Alasdair McAndrew <address@hidden> wrote:

I'm setting up a matrix of student marks; using NaNs for non-existent data: a question not attempted.  I'd like to be able to store this as ascii text outside of Octave, with a row looking something like

5 2 N 3 4 N N 3 6 4

the N's indicating questions not attempted.  I can read this into Octave with "fileread", and I get a long string, which I can then fiddle with to turn into numeric values and NaNs.  The function "dlmread" is more convenient, but converts all non-numeric data to zeros.

Is there an easy way to store NaNs in an ascii file, and how then can that file be best read into Ocatve?

Thanks,
Alasdair

a =

     1     2   NaN     4     6

>> save -ascii a.txt a

b=load('a.txt')

b =

     1     2   NaN     4     6

>>

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DAS