Re: [Gnuplot-info] v5.0 regression

[David L. <da...@la...>]

On Fri, 9 Jan 2015, Ethan A Merritt wrote:

> On Friday, 09 January 2015 02:14:27 PM David Lang wrote:
>> I ran into a case that worked with v4.x that doesn't work with v5, namely when
>> plotting points from a file where the x column is a timestamp and the file had
>> column headers, v4 seems to have ignored the header column (apparently deciding
>> that the timestamp was invalid and so throwing out the entire line), while v5
>> interprets the timestamp as 01-01-0000 and scaleing the entire plot to include
>> this date.
>
> There are a number of things you could do.
>
> 1) You could tell gnuplot that the first line contains column headers:
>
>    set key autotitle columnhead
>
> 2) You could tell it to skip the first line of the file
>
>    plot 'foo' skip 1 using ...
>
> 3) You could explicitly filter out 0 times from the input
>
>    plot 'foo' using ($1 == 0 ? NaN : timecol(1)): ...
>
> Possibly other alternatives as well.

In my case I changed the data fetching routine to filter out the column headers 
from the file.

I just was surprised when the plot that was working on my production system 
didn't work on my desktop (where I had installed 5.0). If this wasn't something 
that worked on the older versions, I would just shrug it off as "don't do that", 
but the fact that it broke a working config made me post about it.

David Lang