# Homework Help: Complex Parametric Function

1. May 1, 2009

### Niles

1. The problem statement, all variables and given/known data
Hi all.

I am given the following parametric function in the complex plane C:

$$\gamma = \left\{ {\begin{array}{*{20}c} {t^2 + it\,\,\,\,\,\,\,\,{\rm{for }}\,\,t \in [0,1]} \\ {t + i\,\,\,\,\,\,\,\,\,\,\,\,{\rm{for }}\,\,t \in ]1,2]} \\ \end{array}} \right.$$

In order to sketch it for t in [0,1], will it be correct it I set x(t) = t2 and y(t) = t, and sketch it in the real plane?

Best regards,
Niles.

2. May 1, 2009

### HallsofIvy

For $0\le t\le 1$, yes. For $1< t\le 2$, x= t, y= 1. Draw those two pieces.

3. May 2, 2009

### Niles

Thanks.

Lets look at e.g. w = z2 = r2ei2K = r2(cos(2K) + isin(2K)), where K is the argument of z and r is the modulus. If I wish to plot w = z2, then can I do this by plotting x(t) = r2cos(2K) and y(t) = r2sin(2K) as well?

Best regards,
Niles.

4. May 3, 2009

### Niles

The reason why I am asking is that I seem to get confused when I look at complex numbers as mere parametric functions. Is it correct to look at them in this sense?

Last edited: May 3, 2009