Re: cell2csv (io package): Higher precision of floating point numbers?

[Philip Nienhuis]

Martin Kunz wrote
> Hi,
> 
> Is there a way to increase the precision of the floating point numbers
> that are written by cell2csv? It seems to be 6 significant digits at the
> moment which is probably fine in most cases. However, I would like to
> write geographic coordinates in decimal degrees and cannot achieve the
> desired sub-metre resolution with "only" six digits.

In the io package's src subdir there's csv2cell.cc.
>From what I understand, in line 291:

double val = strtod (word_str, &err);

you can experiment with invoking strtold rather than strtod.Maybe it should
look like:

long double val = strtold (word_str, &err);

(my C++ knowledge is quite lacking)
Then, just run : 

clear -f            ## (hopefully csv2cell gets unloaded from Octave's
symbol table)
mkoctfile csv2cell.cc

and cross your fingers.

Please report back,

Philip




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