Plotting vectors

I received an e-mail from a reader, I feel happy with it, so if anyone needs help, I'm receiving asks.

So, let's follow with our Scilab's tutorial.

This post is about plotting vectors, like the picture.


This kind of plotting is very common for applications on electromagnetism or analysis of fluids.

In Scilab, we can use the champ(.) function for plotting vectors.

Look the following script:

-->x = -5:5;

-->y = 0:4;

-->[xv yv] = meshgrid(x, y)
yv =

0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.
1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1.
2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2.
3. 3. 3. 3. 3. 3. 3. 3. 3. 3. 3.
4. 4. 4. 4. 4. 4. 4. 4. 4. 4. 4.
xv =

- 5. - 4. - 3. - 2. - 1. 0. 1. 2. 3. 4. 5.
- 5. - 4. - 3. - 2. - 1. 0. 1. 2. 3. 4. 5.
- 5. - 4. - 3. - 2. - 1. 0. 1. 2. 3. 4. 5.
- 5. - 4. - 3. - 2. - 1. 0. 1. 2. 3. 4. 5.
- 5. - 4. - 3. - 2. - 1. 0. 1. 2. 3. 4. 5.

-->wx = %pi/3;

-->xv = cos(wx*xv);

-->yv = yv/max(yv);

-->champ(x, y, xv', yv', 1);



The result is showed following:


The champ(.) has five arguments, the first and the second are the coordinates of each vector, the third and the fourth are the components of each vector, and the fifth is a correction argument (for normalization).

Try to make graphs and say me what happens.