imag 虚部

## 呼び出し手順

    y = imag(x)

## 引数

x

  実数または複素数のベクトルまたは行列.

y

  matrix of real numbers, polynomials or rationals, with same sizes than `x`.

## 説明

`imag(x)`は, `x`の虚部です. ( 複素数を入力するには`%i`を参照ください).

## 例

    c = [ 2 %i, 1+0*%i, 2-3*%i  log(-1) (-1)^(1/3) ]
    imag(c)
    s = sprand(3,3,0.3) + sprand(3,3,0.3)*%i
    imag(s)

    // Polynomials with complex coeficients:
    A = [1-%i*%z (%z-%i)^2]
    imag(A)

    // Rationals with complex coeficients:
    A = [ %z/(1-%z)  (1-%z)/%z^2];
    B = A(1,[2 1]);
    C = A + %i*B
    B, imag(C)

## 参照

- real

## 履歴

6.0 Extension to rationals