Re: [Gnuplot-info] Gnuplot-- changing ranges on replot (polar coordinates)?

[Thomas S. <t.s...@fz...>]

# full range
set trange [0:360]
# points at integer values
set samples 361
plot t<=90.?4.:((t>=180.&&t<=270.)?5.:0/0)


Propane13 wrote:
> 
> Hello!
> 
> I am currently using gp440win32.
> For a project, I'm using polar coordinates, and I want to try to make a
> graph that has 2 arcs.
> 
> Here's my current program:
> set angles degrees
> #set angles radians
> set polar
> set size square
> set xrange [-10:10]
> set yrange [-10:10]
> set grid polar
> set xtics 1
> set polar
> plot [0:90] 4
> replot [180:270] 5
> 
> I get this error:
> "Cannot set range with replot"
> 
> Ideally, this program would allow me to have 2 arcs drawn.
> I can change the "replot" to "plot", and it'll work, but I lose the first
> data plot.
> 
> I'm guessing this is a constraint on the way the system is set up.
> 
> I did some google searching for awhile, and I found out that someone tried
> to do something similar, and had a workaround that worked for cartesian
> coordinates:
> http://objectmix.com/graphics/139526-plotting-part-sinusoid.html
> 
> I was wondering if such a solution should also work for polar coordinates?
> Or, perhaps there is a way to remove this constraint from gnuplot?
> 
> Another solution I guess would be for me to have an equation where:
> r=4 0<t<90, 
> r=5, 180<t<270
> But I haven't been able to get such commands to work successfully.
> 
> Does anyone know if I'm doing something simple incorrectly?
> Any help would be appreciated.
> 
> Note that I tried some searching online, and of the forums before turning
> here, as I don't want to waste anyone's time if I could help it.
> 
> Best regards,
>   -John
> 

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