From: 520079130762-0001@... (Michael Neumann)
Date: 2002-11-08T06:18:37+09:00
Subject: Re: v.polar = rho, theta

On Thu, 2002-11-07 at 22:09, Hans Fugal wrote:
> Hi, I'm using the Vector class and needed a way to set the vector with 
> polar coordinates. My solution:
> 
> class Vector
>      def set_polar(rho,theta)
> 	@elements[0] = rho * Math.cos(theta)
> 	@elements[1] = rho * Math.sin(theta)
>      end
> end
> 
> But it struck me that defining polar=(rho,theta) would be more 
> ruby-like, and I expected to call it like so: v.polar = 1, 3.14
> That doesn't work, though. This does, but it's ugly:
> 
> irb(main):020:0> v = Vector[0,0]
> Vector[0, 0]
> irb(main):021:0> v.send(:polar=,1,3.14)
> 0.001592652916
> irb(main):022:0> v.inspect
> "Vector[-0.9999987317, 0.001592652916]"
> 
> Is there another way, or what should I do?

v.polar(1, 3.14)

or 

v.polar= [1,3.14]   # polar takes an array as argument

or name the method set_polar.


Regards,

  Michael