[HN Gopher] Complex Mapping Visualizer
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       Complex Mapping Visualizer
        
       Author : vector_spaces
       Score  : 45 points
       Date   : 2021-03-12 23:53 UTC (23 hours ago)
        
 (HTM) web link (mabotkin.github.io)
 (TXT) w3m dump (mabotkin.github.io)
        
       | brandonpelfrey wrote:
       | If you like this kind of stuff, also feel free to play around
       | with a realtime complex-valued expression->glsl version I made a
       | while back. I like the one here a lot as well since it probably
       | runs everywhere even without webgl
       | 
       | http://brandonpelfrey.github.io/complex-function-plot/?expre...
        
       | nabla9 wrote:
       | This is really good learning aid. I hope I hand this when I was
       | learning complex numbers.
       | 
       | 1. draw a grid of horizontal and vertical lines,
       | 
       | 2. then try                   z^X where x in 0.1, 0.5, 1, 1.1
       | ,1.5, 2              1/z                  sin(X*z) where X in 0.1
       | ... 2              1/sin(z)
       | 
       | 3. ... and think and do the math (with pen and paper) until it
       | makes sense.
       | 
       | 4. can you figure out what 2^z is without trying out?
        
       | bonzini wrote:
       | This is a really cool technique, I programmed it on a graphing
       | calculator back in my teens and it was perhaps the first thing I
       | did that ended up on the web.
        
       | ianai wrote:
       | Be sure to fudge with the range settings!
       | 
       | This one was fun: z^5+7z^4-3z^3-15z^2-z+9
        
         | jimkleiber wrote:
         | Hmm, when I try that one it gives me an "invalid function"
         | dialog. Tried it on Firefox and Chrome.
         | 
         | Any suggestion on how to get it work? Do I have to change the
         | range settings, if so, to what?
        
       | vincnetas wrote:
       | Fork for ones to lazy to draw grid each time after reseting a
       | mapping: https://vincnetas.github.io/complex-map/
        
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       (page generated 2021-03-13 23:02 UTC)