gnuplot-info

[Gnuplot-info] how to plot a parametric function "with circles"

[Ether J. <ma...@et...>]

Hello.

I want to plot the parametric function
x(t) = t+log(t+1)
y(t) = sqrt(t)+sin(t)

from t=0 to t=2

in steps of dt = 0.2

using circles of radius 0.05 (instead of points)

I searched for about 2 hours but could not find how to do this directly
in gnuplot.  I could create a data file and then plot that, but I want to
plot the functions directly.

Is there a way to do that in gnuplot?

Thank you.

Re: [Gnuplot-info] how to plot a parametric function "with circles"

[Ethan A M. <eam...@gm...>]

On Monday, 16 January 2017 05:13:57 PM Ether Jones wrote:
> Hello.
> 
> I want to plot the parametric function
> x(t) = t+log(t+1)
> y(t) = sqrt(t)+sin(t)
> 
> from t=0 to t=2
> 
> in steps of dt = 0.2
> 
> using circles of radius 0.05 (instead of points)

set samples 21
plot sample [t=0:2] '+' using (t+log(t+1)) : (sqrt(t)+sin(t)) : (0.05) with circles

There is currently no way to directly specify a step size for sampling, but since you
can control the endpoints and the number of samples it is still possible. 

> I searched for about 2 hours but could not find how to do this directly
> in gnuplot.  I could create a data file and then plot that, but I want to
> plot the functions directly.
> 
> Is there a way to do that in gnuplot?

Several, but I think the one I show above is the easiest.

Re: [Gnuplot-info] how to plot a parametric function "with circles"

[Ethan A M. <eam...@gm...>]

On Monday, 16 January 2017 02:56:41 PM Ethan A Merritt wrote:
> On Monday, 16 January 2017 05:13:57 PM Ether Jones wrote:
> > Hello.
> > 
> > I want to plot the parametric function
> > x(t) = t+log(t+1)
> > y(t) = sqrt(t)+sin(t)
> > 
> > from t=0 to t=2
> > 
> > in steps of dt = 0.2
> > 
> > using circles of radius 0.05 (instead of points)
> 
> set samples 21

    oops.  11, not 21

> plot sample [t=0:2] '+' using (t+log(t+1)) : (sqrt(t)+sin(t)) : (0.05) with circles
> 
> There is currently no way to directly specify a step size for sampling, but since you
> can control the endpoints and the number of samples it is still possible. 
> 
> > I searched for about 2 hours but could not find how to do this directly
> > in gnuplot.  I could create a data file and then plot that, but I want to
> > plot the functions directly.
> > 
> > Is there a way to do that in gnuplot?
> 
> Several, but I think the one I show above is the easiest.

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