Comments on: Using Complex Numbers in R

By: Micke

Micke — Tue, 24 Jan 2012 09:01:49 +0000

I would like to point out that the statement

Mod(z) == z * Conj(z)

is only true when Mod(z)==1. In general it should be

Mod(z)^2 == z * Conj(z)

By: Alemu

Alemu — Thu, 03 Nov 2011 15:06:22 +0000

I have a negative number that I am raising to -1.253 and it is giving me not a number. Is there a way to treat such a number ?

By: Dubois

Dubois — Thu, 17 Feb 2011 22:00:31 +0000

Would you know to code the Parzen memory index delta as described in Parzen(1983)?
if you can please help!

By: Matthew

Matthew — Mon, 16 Aug 2010 05:50:45 +0000

good stuff John. any movement on the construction of high- and low-spatial frequency filters in R? I’d really like to see how you do that.

Cheers,

matthew

By: Giuseppe

Giuseppe — Sat, 26 Dec 2009 10:39:55 +0000

Actually the blank lines are due to the matrix elements being NA on those coordinates. They are not set due to rounding errors in the matrix indexing. To fix it just use:

m[round((x + resolution + 1) / resolution), round((y + resolution + 1) / resolution)] <- mandelbrot

By: Tal Galili

Tal Galili — Sat, 19 Dec 2009 12:13:59 +0000

I think the lines in the image are due to the use of the png algorithm (which is considered better for graphs with lines then “picture” graphs).
Try using “jpeg” (or maybe “pdf”)
And see what that gives.

p.s: please consider installing the plugin “subscribe to comments” on this blog.

Best,
Tal