How do you plot an R-Theta chart in Excel, i.e. a circular chart with the
independent axis (angle) in degrees from 0 to 360 degrees and amplitude as
the radial distance from the center point?

In article <CE5D63AB-12A3-4042-928A-(E-Mail Removed)>, Wes12
@discussions.microsoft.com says...
> How do you plot an R-Theta chart in Excel, i.e. a circular chart with the
> independent axis (angle) in degrees from 0 to 360 degrees and amplitude as
> the radial distance from the center point?
>
You have to convert the data to (x,y) with the formulas x=r*cost(theta) and
y=r*sin(theta) where theta is in radians.

--
Regards,

Tushar Mehta
www.tushar-mehta.com
Excel, PowerPoint, and VBA add-ins, tutorials
Custom MS Office productivity solutions

Thanks, Good suggestion.

"Tushar Mehta" wrote:

> In article <CE5D63AB-12A3-4042-928A-(E-Mail Removed)>, Wes12
> @discussions.microsoft.com says...
> > How do you plot an R-Theta chart in Excel, i.e. a circular chart with the
> > independent axis (angle) in degrees from 0 to 360 degrees and amplitude as
> > the radial distance from the center point?
> >
> You have to convert the data to (x,y) with the formulas x=r*cost(theta) and
> y=r*sin(theta) where theta is in radians.
>
> --
> Regards,
>
> Tushar Mehta
> www.tushar-mehta.com
> Excel, PowerPoint, and VBA add-ins, tutorials
> Custom MS Office productivity solutions
>

Hi,

These maybe of interest to you.
http://www.andypope.info/charts/polarplot2.htm
http://www.andypope.info/charts/polarplot.htm

Cheers
Andy

Wes12 wrote:
> How do you plot an R-Theta chart in Excel, i.e. a circular chart with the
> independent axis (angle) in degrees from 0 to 360 degrees and amplitude as
> the radial distance from the center point?

--

Andy Pope, Microsoft MVP - Excel
http://www.andypope.info

Hi Andy,

I've shied away from using a Radar plot for parametric plots because I've
always seen it as more like a Line chart turned into a circle rather than a
XY Scatter chart.

But, as you demonstrate, it does have some advantages. There's no need to
specify theta values (though, that can be a disadvantage), and the ability
to create a filled-in plot, something not (easily?) possible with a XY
chart.

The big disadvantage is that whatever one wants to do must be accomplished
in theta = 0 to 2*Pi -- though, I am hesitant to make a claim that you might
decide to prove wrong. {grin}

That precludes something like the butterfly plot given by

x=COS(t)*(EXP(COS(t))-2*COS(4*t)-SIN(t/12)^5)
y=SIN(t)*(EXP(COS(t))-2*COS(4*t)-SIN(t/12)^5)

for 0<= t <= 24*Pi

--
Regards,

Tushar Mehta
www.tushar-mehta.com
Excel, PowerPoint, and VBA add-ins, tutorials
Custom MS Office productivity solutions

In article <(E-Mail Removed)>, (E-Mail Removed)
says...
> Hi,
>
> These maybe of interest to you.
> http://www.andypope.info/charts/polarplot2.htm
> http://www.andypope.info/charts/polarplot.htm
>
> Cheers
> Andy
>
> Wes12 wrote:
> > How do you plot an R-Theta chart in Excel, i.e. a circular chart with the
> > independent axis (angle) in degrees from 0 to 360 degrees and amplitude as
> > the radial distance from the center point?
>
>

Hi Tushar,

You are correct, any plot which includes values greater the 2*Pi
requires the use of multiple series.

Cheers
Andy

Tushar Mehta wrote:
> Hi Andy,
>
> I've shied away from using a Radar plot for parametric plots because I've
> always seen it as more like a Line chart turned into a circle rather than a
> XY Scatter chart.
>
> But, as you demonstrate, it does have some advantages. There's no need to
> specify theta values (though, that can be a disadvantage), and the ability
> to create a filled-in plot, something not (easily?) possible with a XY
> chart.
>
> The big disadvantage is that whatever one wants to do must be accomplished
> in theta = 0 to 2*Pi -- though, I am hesitant to make a claim that you might
> decide to prove wrong. {grin}
>
> That precludes something like the butterfly plot given by
>
> x=COS(t)*(EXP(COS(t))-2*COS(4*t)-SIN(t/12)^5)
> y=SIN(t)*(EXP(COS(t))-2*COS(4*t)-SIN(t/12)^5)
>
> for 0<= t <= 24*Pi
>

--

Andy Pope, Microsoft MVP - Excel
http://www.andypope.info

Thanks, Great work. I have already satisfied my need by building a
bare-bones chart using the r*sin(a) and r*cons(a) method. Just wanted to
plot a scatter chart of wind speed vs. compass direction from my new weather
station. I don't know if this will work, but you can try viewing it as a .jpg
picture at ftp://wboyer.net/Polar%20Chart/ .

"Andy Pope" wrote:

> Hi,
>
> These maybe of interest to you.
> http://www.andypope.info/charts/polarplot2.htm
> http://www.andypope.info/charts/polarplot.htm
>
> Cheers
> Andy
>
> Wes12 wrote:
> > How do you plot an R-Theta chart in Excel, i.e. a circular chart with the
> > independent axis (angle) in degrees from 0 to 360 degrees and amplitude as
> > the radial distance from the center point?
>
> --
>
> Andy Pope, Microsoft MVP - Excel
> http://www.andypope.info
>