Hi, Raksha,
You’ve run into a wart in the Gnupot API. By default, the line type increments
with each curve plotted — even if the “curve” is an image. So your overplotted
vectors are being rendered with linetype 2, which is both a different color and
also dashed. You can avoid that by explicitly using the curve option “lt=>1”
(“linetype 1”) on the second plot. Just throw “lt=>1” into the parameter list
right after the “with” option.
You can also suppress dashes with “dt=>1” (“dashtype 1”) as a curve option.
> On May 30, 2018, at 10:18 AM, Raksha Singla <[email protected]> wrote:
>
> Hi,
>
>
> I am new to Perl and PDL and I tried to use PDL::Graphics::Gnuplot
> package in my Perl script for making a plot. I tried to plot some data
> with "image" type plot of Gnuplot and also with "vectors" and both of
> these seemed to work perfectly fine separately. However, when I tried
> to do plot a data first with "image" type and then replot on the same
> graph using "vectors", it does not work properly and the vectors drawn
> by Gnuplot on top of the image have its arrows and the line as dashed
> instead of a solid line. I tried doing this on Gnuplot alone and it works
> fine, the error comes only when using PDL::Graphics::Gnuplot.
>
> Looking forward to get any suggestions to help me solve the problem.
>
> Thank You
>
> Raksha
> ICF- UNAM
> Mexico
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