I'm using Python 3.4, and I have NunPy/SciPy already installed. I need to read a text file with the following structure:
*Node
1, -0.600000024, 1.20000005, 0.
2, -0.600000024, 0.300000012, 0.
3, -0.480560571, 0.1741862, 0.
4, -0.335430175, 0.0791868418, 0.
(...)
n, x, y, z
*Element
1, 1, 2, 3, 4
2, 5, 6, 7, 8
(...)
n, a, b, c, d
From this txt file I need to create a matrix called "node", which contains the info between *Node and *Element, I mean, it has to have 4 columns and n lines, for example:
node=array([1, -0.600000024, 1.20000005, 0.],[2, -0.600000024, 0.300000012, 0.], [3, -0.480560571, 0.1741862, 0.],[4, -0.335430175, 0.0791868418, 0.], [n, x, y, z])
And another matrix called "element", which contains the lines after *Element:
element=array([1, 1, 2, 3, 4], [2, 5, 6, 7, 8], [n, a, b, c, d])
Indeed, I need just to "read" the text file and write this content into two matrices. However, I have to separete the information that is under *Node from that under *Element. I have to have two matrices, one with nodes and other with elements... But I'm new at Python and have no idea on how to read a text file in this way and generate those matrices...
I'd appreciate any help/example. Thanks a lot!
Creating a list with the lines in your file, then creating sub lists starting and stopping at the index if '*Node' and '*Element' should work for you:
r=[]
s = open('File.txt')
For line in s:
r.append(line.strip('\n'))
Node=[]
Element=[]
For i in r[r.index('*Node')+1:r.index('*Element')]:
Node.append(map(float,i.split(',')))
For j in r[r.index('*Element')+1:]:
Element.append(map(int, j.split(','))
Node=np.array(Node)
Element=np.array(Element)