Re: real nos. with "D"exponent

Look in the documentation for the command "set datafile fortran"

The `set datafile fortran` command enables a special check for values in
the
input file expressed as Fortran D or Q constants. This extra check slows
down
the input process, and should only be selected if you do in fact have
datafiles
containing Fortran D or Q constants. The option can be disabled again using
`unset datafile fortran`.



On Wed, Aug 12, 2026 at 6:06 PM Al Conle <[email protected]> wrote:

> Hi Gnuplot,
>
> Minor problem while using gnuplot6.0.0
>
> I have a larger txt file of 10 data columns showing a problem and a
> file with a fix.
> Below is  a  "tail"  of both files :
> cat tailBad+Good.txt
> #==> badFile.txt <==
> -0.00064 -0.00890   -25.9  -878.3 -1729.7   599.0    1995   22013.
>  0.4542704D-04  0.9625114D-01
> -0.00065 -0.00890   -26.6  -877.8 -1730.0   598.8    1997   22070.
>  0.4531073D-04  0.9634200D-01
> -0.00065 -0.00890   -26.6  -878.0 -1730.0   598.6    1998   22101.
>  0.4524784D-04  0.9638724D-01
> -0.00065 -0.00890   -26.6  -877.7 -1730.0   598.5    1999   22134.
>  0.4517834D-04  0.9643242D-01
> -0.00065 -0.00889   -26.9  -877.7 -1728.4   598.5    2000   22134.
>  0.4517834D-04  0.9647760D-01
>
> #==> goodFile.txt <==
> -0.00064 -0.00890   -25.9  -878.8 -1729.7   599.2    1994   21957. 0.000046
> 0.096206
> -0.00064 -0.00890   -25.9  -878.3 -1729.7   599.0    1995   22013. 0.000045
> 0.096251
> -0.00065 -0.00890   -26.6  -877.8 -1730.0   598.8    1997   22070. 0.000045
> 0.096342
> -0.00065 -0.00890   -26.6  -878.0 -1730.0   598.6    1998   22101. 0.000045
> 0.096387
> -0.00065 -0.00890   -26.6  -877.7 -1730.0   598.5    1999   22134. 0.000045
> 0.096432
> -0.00065 -0.00889   -26.9  -877.7 -1728.4   598.5    2000   22134. 0.000045
> 0.096478
>
>
> When plotted with command:
>     plot "tailBad+Good.txt" u 7:10 w l
>
>
> the plot shows two lines.  It seems that the   *D-01"  exponent is not
> correctly interpreted.   If I change all the  "D"  to "E" and replot, the
> lines are on top of each other.
>
> I am downloading  and installing 6.5 tomorrow and will check if the
> problem is solved in that version.
>
> Thanks for creating a great Gnuplot !
> It is a wonderful, useful tool !
>
> Al Conle
>
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