Thanks for what you sent. What caused me to be somewhat unhappy was that
plot will not allow me to select the range for the y-axis. In your graph
the y-axis goes from 0 to 2 but I want _2 to 2.
So, I tried to make my own graph paper. To get vertical lines I needed some
help from Bo.
However, I think you are correct to say that I will need to put the parabola
in the complex plane.
I just reailized that answer may be in Raul's Red Valentine.
require 'plot'
X=: 16 * (1&o.)^3:
Y=: 13 _5 _2 _1 +/ .* 2 o. (1+i.4)&*
plot (X j. Y"0) i: 3.15j1000
'color red' plot (X j. Y"0) i: 3.15j1000
'pensize 8;color red' plot (X j. Y"0) i: 3.15j1000
pd 'color red;pensize 8'
pd (X j. Y"0) 1j1#i: 3.15j1000
pd 'color blue;pensize 15'
pd nn=. 3j2-~2%~(_16}.5+i:5j99)^~/1j1*1+99%~i:5j999
pd (1.5*2-~0{tt)j."1 (1{tt)+"1 (8%~1-~i.5)+/|.400%~i.1000 [ tt=.|:+._1{nn
pd 'show'
Linda
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of alexgian
Sent: Friday, April 25, 2014 1:15 AM
To: J Programming forum
Subject: Re: [Jprogramming] paarabola on graph paper
Further, you seem to have specified your grid in the Argand plane, I don't
think you can mix and match with reals just like that (I may be wrong -
certainly no expert on J plotting).
So you'd have to translate your parabola to complex coords if you wanted to
display it in the same context, I think.
On 25 April 2014 06:00, alexgian <[email protected]> wrote:
> Not quite sure what you're trying to do, but would this be a step in the
> right direction?
>
>
> load 'plot'
>
> do=: 13 :'({.y) +(i.>:{:y)*(--/ 2{.y)%{:y'
>
> G=:do _2 2 32
>
> P=: 2 <. *:
>
> plot (];P) G
>
>
> In your version you have not specified x-coordinates, so it picks 0-32.
>
> By using ] you specify the x-range
>
>
> Also note that that you do not need "do", there is a plot builtin called
> "steps":
>
> plot (];P) steps _2 2 32
>
> would achieve the same result
>
>
>
>
>
> On 25 April 2014 01:25, Linda Alvord <[email protected]> wrote:
>
>> Can anyone help me put the parabola, P, on the graph paper without
>> changing
>> the scales of the graph paper.
>>
>> load 'plot'
>> do=: 13 :'({.y) +(i.>:{:y)*(--/ 2{.y)%{:y'
>> A=:do _2 2 8
>> V=:j./~ A
>> H=:|:|. V
>> 'pensize 2;color 50 255 255' plot H,V
>>
>> f=:*:
>> 'pensize 2;color BLUE' plot P=: 2 <. f do _2 2 32
>>
>> Linda
>> ----------------------------------------------------------------------
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>>
>
>
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