🚀 go-pugleaf

crawford richard (u600256@rho.LANL.GOV) wrote:
: ggg@crl.com (Gilbert Goodwill) asked about 2D binary data.

: gnuplot 3.5 has no provision for it.  Sadly, neither does 3.6, at least
: as of now.  There's no major hangup that I'm aware of, except that the
: folks doing the majority of the work have had other priorities.  One
: thing that will be needed is a standard format: do we want just (x,y)
: pairs as far as the eye can see?  That's probably easiest, but it doesn't
: allow for error bars or other glitzy stuff.  But the 3D format is similarly
: limiting.

: Dick Crawford, aka rccrawford@lanl.gov

Well, I needed to speed things up (I'm using named pipes for the output
of graphs that often have lots of points in them) so I made some slight
modifications to the 3.5 command.c.  They're real simple, only handling 2
columns of data, but for only 20 or so lines, it does the trick.  I'm not
sure I handled all machines correctly (I I just followed the examples for
the 3D binary stuff) but it works well on SVR4 and SVR3 machines for me.

# diff command.bak command.c
1051a1052,1075
> /* mod - GGG */
>       if(is_binary_file(data_fp)){
> #if defined(MSDOS)||defined(ATARI)||defined(OS2)||defined(_Windows)||de
fined(DOS386)
>       /* file must be opened with binary flag. the old cr/lf problem ag
ain */
> #ifdef PIPES
>               if( pipe_open ) {
>                 pclose(data_fp);
>                 data_fp=NULL;
>                 pipe_openúLSE;
>                 int_error("binary data from pipes is not implemented",
NO_CARET);
>               }
> #endif
>               data_fp = freopen(data_file, "rb", data_fp);
> #endif
>               while(fread(fval, sizeof(float), 2, data_fp) == 2){
>                       if (i >= this_plot->p_max) {
>                               cp_extend(this_plot, i + (i < 1000 ? i :
1000));
>                       }
>                       v[0] = fval[0];
>                       v[1] = fval[1];
>                       store2d_point(this_plot, i++, v[0], v[1], v[1], v
[1], -1.0);
>               }
>       } else
> /* end mod - GGG */