sn {elliptic}R Documentation

Jacobi form of the elliptic functions

Description

Usage

ss(u,m, ...)
sc(u,m, ...)
sn(u,m, ...)
sd(u,m, ...)
cs(u,m, ...)
cc(u,m, ...)
cn(u,m, ...)
cd(u,m, ...)
ns(u,m, ...)
nc(u,m, ...)
nn(u,m, ...)
nd(u,m, ...)
ds(u,m, ...)
dc(u,m, ...)
dn(u,m, ...)
dd(u,m, ...)

Arguments

u Complex argument
m Parameter
... Extra arguments, such as maxiter, passed to theta.?()

Details

All sixteen Jacobi elliptic functions.

Author(s)

Robin K. S. Hankin

References

AMS-55

See Also

theta

Examples


#Example 1, p579:
nc(1.9965,m=0.64)
# (some problem here)

# Example 2, p579:
dn(0.20,0.19)

# Example 3, p579:
dn(0.2,0.81)

# Example 4, p580:
cn(0.2,0.81)

# Example 5, p580:
dc(0.672,0.36)

# Example 6, p580:
Theta(0.6,m=0.36)

# Example 7, p581:
cs(0.53601,0.09)

# Example 8, p581:
sn(0.61802,0.5)

#Example 9, p581:
sn(0.61802,m=0.5)

#Example 11, p581:
cs(0.99391,m=0.5)
# (should be 0.75 exactly)

#and now a pretty picture:

n <- 300
K <- K.fun(1/2)
f <- function(z){1i*log((z-1.7+3i)*(z-1.7-3i)/(z+1-0.3i)/(z+1+0.3i))}
# f <- function(z){log((z-1.7+3i)/(z+1.7+3i)*(z+1-0.3i)/(z-1-0.3i))}
x <- seq(from=-K,to=K,len=n)
y <- seq(from=0,to=K,len=n)
z <- outer(x,1i*y,"+")
view(x,y,(f(sn(z,m=1/2))),nlevels=44,imag.contour=TRUE,real.cont=TRUE,code=1,drawlabels=FALSE,main="Potential flow in a rectangle",axes=FALSE,xlab="",ylab="")
rect(-K,0,K,K,lwd=3)




[Package elliptic version 1.0-1 Index]