my.hsv <- function(z,int0=0.6,sat0=0.3,int1=1,sat1=1){
arg <- Arg(z)
s <- which(arg<0)
arg[s] <- arg[s]+2*pi
r <- Mod(z)
s <- which(r>1)
r[s] <- log(r[s])
r. <- 4*(r%%1)
k <- floor(r.)
r. <- r.-k
inten <- sat <- rep(0,length(r))
s <- which(k==0)
inten[s] <- int1
sat[s] <- sat1-(sat1-sat0)*r.[s]
s <- which(k==1)
inten[s] <- int1-(int1-int0)*r.[s]
sat[s] <- sat0
s <- which(k==2)
inten[s] <- int0
sat[s] <- sat1-(sat1-sat0)*(1-r.[s])
s <- which(k==3)
inten[s] <- int1-(int1-int0)*(1-r.[s])
sat[s] <- sat1
return(cbind(arg,inten,sat))
}
my.hsv2rgb <- function(h,s,v){
hi <- floor(h/(2*pi)*6)
hi[which(hi==6)] <- 0
f <- (h/(2*pi)*6) %%1
p <- v*(1-s)
q <- v *(1-f*s)
t <- v *(1-(1-f)*s)
r <- g <- b <- rep(0,length(h))
s <- which(hi==0)
r[s] <- v[s];g[s] <- t[s]; b[s] = p[s];
s <- which(hi==1)
r[s] <- q[s];g[s] <- v[s]; b[s] = p[s];
s <- which(hi==2)
r[s] <- p[s];g[s] <- v[s]; b[s] = t[s];
s <- which(hi==3)
r[s] <- p[s];g[s] <- q[s]; b[s] = v[s];
s <- which(hi==4)
r[s] <- t[s];g[s] <- p[s]; b[s] = v[s];
s <- which(hi==5)
r[s] <- v[s];g[s] <- p[s]; b[s] = q[s];
return(cbind(r,g,b))
}
x <- seq(from=-4,to=4,len=100)
xx <- expand.grid(x,x)
z <- xx[,1]+1i * xx[,2]
w <- z
hsv <- my.hsv(w,int0=0.6,sat0=0.2,int1=1,sat1=0.6)
col <- my.hsv2rgb(hsv[,1],hsv[,3],hsv[,2])
plot(xx,pch=20,col=rgb(col[,1],col[,2],col[,3]))
library(pracma)
x <- seq(from=-50,to=50,len=100)
xx <- expand.grid(x,x)
z <- xx[,1]+1i * xx[,2]
my.f <- zeta
w <- my.f(z)
hsv <- my.hsv(w,int0=0.6,sat0=0.2,int1=1,sat1=0.6)
col <- my.hsv2rgb(hsv[,1],hsv[,3],hsv[,2])
plot(xx,pch=20,col=rgb(col[,1],col[,2],col[,3]))
- 円をアトラクタとして円の外側と内側とでは軌道の回転方向がかわるようなベクトル場は…
x <- seq(from=-1,to=1,len=100)
xx <- expand.grid(x,x)
z <- xx[,1]+1i * xx[,2]
my.vec <- function(x,R =1, k=1){
r <- sqrt(sum(x^2))
v <- c(-x[2],x[1])
v <- v/r
V <- k/abs(r-R)
V.2 <- k/(R-r)
v*V.2+V.2*x
}
my.f <- function(z){
x <- c(Re(z),Im(z))
w <- my.vec(x,R=0.5,k=1)
w[1] + 1i*w[2]
}
w <- rep(0,length(z))
for(i in 1:length(w)){
w[i] <- my.f(z[i])
}
hsv <- my.hsv(w,int0=0.6,sat0=0.2,int1=1,sat1=0.6)
col <- my.hsv2rgb(hsv[,1],hsv[,3],hsv[,2])
plot(xx,pch=20,col=rgb(col[,1],col[,2],col[,3]))
x <- seq(from=-1,to=1,len=100)*2*pi
xx <- expand.grid(x,x)
z <- xx[,1]+1i * xx[,2]
my.vec <- function(x){
r <- sqrt(sum(x^2))
r <- r^1*1
M <- matrix(c(cos(r),-sin(r),sin(r),cos(r)),byrow=TRUE,2,2)
tmp <- c(M %*% x)
tmp/sqrt(sum(tmp^2))
}
w <- rep(0,length(z))
for(i in 1:length(w)){
tmp <- my.vec(c(Re(z[i]),Im(z[i])))
w[i] <- tmp[1] + 1i * tmp[2]
}
hsv <- my.hsv(w,int0=0.6,sat0=0.2,int1=1,sat1=0.6)
col <- my.hsv2rgb(hsv[,1],hsv[,3],hsv[,2])
plot(xx,pch=20,col=rgb(col[,1],col[,2],col[,3]))