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# %sn

Jacobi's elliptic function (obsolete)

### Syntax

`y = %sn(x, m)`

### Arguments

x

a point inside the fundamental rectangle defined by the elliptic integral; `x` is a vector of complex numbers

m

parameter of the elliptic integral (`0<m<1`)

y

result

### Description %sn() is obsolete and will be removed from Scilab 6.1.x. Please use ellipj() instead.

Jacobi 's sn elliptic function with parameter `m`: the inverse of the elliptic integral for the parameter `m`.

The amplitude am is computed in fortran and the addition formulas for elliptic functions are applied

### Examples

```m=0.36;
K=%k(m);
P=4*K; //Real period
real_val=0:(P/50):P;
plot(real_val,real(%sn(real_val,m)))``` ```clf();
m=0.36;
KK=%k(1-m);
Ip=2*KK;
ima_val1=0:(Ip/50):KK-0.001;
ima_val2=(KK+0.05):(Ip/25):(Ip+KK);
z1=%sn(%i*ima_val1,m);
z2=%sn(%i*ima_val2,m);
plot2d([ima_val1',ima_val2'],[imag(z1)',imag(z2)']);
xgrid(3)``` • ellipj — Jacobi elliptic functions
• delip — Integral elíptica
• %k — Jacobi's complete elliptic integral of the first kind (vectorized)

### History

 Version Description 6.1.0 %sn() is declared obsolete. ellipj() must be used instead.