Hi,

I have encountered some problem while I was drawing a direction of

arrow. I have point (x,y) coordinates and angle of them. What I want to

do is that to draw arrow according to the given angle (just to show the

point direction as an arrow in each point coordinate). Here, we should

assume coordinates of ‘+x’, ‘+y’, '-x ', ‘-y’ are 90, 0, 270, 180

degrees, respectively.

I am a bit unfamiliar with Python drawing tools. I am still not sure to

draw directional point (arrow based on angle) whether I use pylab or

some other modules or… still not sure at all. I put the following codes

as a sample to give better description:

import numpy as np

import scipy as sp

import pylab as pl

def draw_line(x,y,angle):

# Inputs:

x = np.array([ 2, 4, 8, 10, 12, 14, 16])

y = np.array([ 5, 10, 15, 20, 25, 30, 35])

angles = np.array([45,275,190,100,280,18,45])

```
# First, draw (x,y) coordinate
???
# Second, according to the angle indicate the direction as
an arrow
???
```

Thanks in advance for your friendly support,