Re: [Gnuplot-info] pulling x-axis time information from a binary file

[Thomas S. <t.s...@fz...>]

'binary' and 'time/date' somehow don't work together,
gnuplot still expects the date as a string in 'binary' mode.
this somehow doesn't make sense...

if you want to compile your own special version of gnuplot
try the following patch:

> diff -u src/datafile.c.orig src/datafile.c
--- src/datafile.c.orig 2009-10-24 11:14:18.000000000 +0200
+++ src/datafile.c      2009-10-24 11:30:18.000000000 +0200
@@ -4539,20 +4539,15 @@
                    struct tm tm;
 
                    if (column > df_no_cols
-                       || df_column[column - 1].good == DF_MISSING
-                       || !df_column[column - 1].position
-                       || !gstrptime(df_column[column - 1].position,
-                                     axis_array[df_axis[output]].timefmt,
-                                     &tm)) {
+                       || df_column[column - 1].good == DF_MISSING) {
                        /* line bad only if user explicitly asked
                         * for this column */
                        if (df_no_use_specs)
                            line_okay = 0;
-
                        /* return or ignore line depending on line_okay */
                        break;
                    }
-                   v[output] = (double) gtimegm(&tm);
+                   v[output] = df_column[column - 1].datum;
                } else if ((column <= df_no_cols)
                           && df_column[column - 1].good == DF_GOOD)
                    v[output] = df_column[column - 1].datum;


Johannes russek wrote:
> 
> Hello everybody,
> 
> I have a binary file that was created with pack("l*",$time,$value); from
> php.
> 
> I can plot the contents of the file fine with
> 
> unset key
> set xtics rotate
> plot 'data.bin' binary format='%int32%int32' using 1:2 with lines
> 
> however, i would like to have the tics on the x-axis as readable
> date/time.
> but when i use this (with or without set timefmt "%s"): 
> 
> unset key
> set xdata time
> set format x "%r %D"
> set xtics rotate
> plot 'data.bin' binary format='%int32%int32' u 1:2 with lines
> 
> i only get an error:
> 
> gnuplot> plot 'data.bin' binary format='%int32%int32' u 1:2 with lines
>                                                                  ^
>          line 0: warning: Skipping data file with no valid points
> 
> gnuplot> plot 'data.bin' binary format='%int32%int32' u 1:2 with lines
>                                                                       ^
>          line 0: x range is invalid
> 
> what am i doing wrong or how can i read time values from a binary file?
> 
> Thanks,
> Johannes
> 
> 
> 
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