i1(x), x a REAL scalar, vector, matrix, array or structure of REAL components. |

i1(x) computes values of I-sub-1(x), the modified Bessel function of the first kind, where x is a REAL scalar, vector, matrix or array. The result is REAL of the same shape as x. When x1, x2, ... are REAL, i1(structure(x1,x2,...)) returns structure(i1(x1),i1(x2), ...) i1 is based on equations 9.8.3 and 9.8.4 in Abramowitz & Stegun, Handbook of Mathematical functions. See also i0().

Gary Oehlert 2003-01-15