Re: Graph feature request

[Joe Beach]

Hmm... I'll have to do some reading about @Filter, I don't remember
noticing it before. Thanks for the help, I'll post the definitions I come
up with if they work nicely.

Joe Beach


On Mon, 19 Nov 2001, Jeff Kingston wrote:

> On Sat, 17 Nov 2001 22:55:28 +0300 (MSK), Joe Beach wrote:
>   >
>   > Hi,
>   >
>   > I currently use Gnuplot to do my plotting. I like it for several reasons,
>   > one of which is that it can read the data from specific columns of a text
>   > file. For example, use the second column of file.txt for the x-values and
>   > the fourth column of file.txt for the y-values. As far as I have been able
>   > to see, there is no way to have Lout do this- you could use an @Include to
>   > read a text file if x is in the first column and y is in the second
>   > column, but that is about it. Is this a feature you would consider for a
>   > later release?
>   >
>   > Joe Beach
>
> Are you on Unix?  Use "cut" in a @Filter:
>
>    def @Cols
>      left cutopts
>      right x
>    {
>       def @Filter { "cut " cutopts @FilterIn ">" @FilterOut }
>
>       x
>    }
>
> and then you can write
>
>    @Data { "-f4,2" @Cols {
>    @Include { mydata.txt }
>    }
>
> At least, that's the basic idea.
>
> Jeff
>
>
>
>
>