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Python Discussion Thread
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Feb 19th, 2009

Convert python list to numpy array.

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Is there an easy way of doing this? for example my list is:

python Syntax (Toggle Plain Text)
nlat=10
mylist = []
 
for x in range(0,nlat):
 
    for y in range(0,nlat):
 
        disk=sphere(pos=(x*s,y*s), radius = r, color=(0,1,9))
 
        mylist.append(disk)
nlat=10
mylist = []

for x in range(0,nlat):

    for y in range(0,nlat):

        disk=sphere(pos=(x*s,y*s), radius = r, color=(0,1,9))

        mylist.append(disk)

or is it impossible to place objects, such as a sphere from vpython into a numpy array?, perhaps i could just put the x,y co-ordinates into a numpy array?

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breatheasier

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Feb 20th, 2009

-1

Re: Convert python list to numpy array.

Numpy handles only numeric arrays, not object arrays.
I think VPython actually uses numpy/numeric internally.

sneekula

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Feb 22nd, 2009

Re: Convert python list to numpy array.

Lists of lists work fine as container arrays (not mathematical arrays, but you don't seem to be wanting that). So:

Python Syntax (Toggle Plain Text)
nlat=10
mylist = []
 
for x in range(0,nlat):
    tmp = []
 
    for y in range(0,nlat):
 
        disk=sphere(pos=(x*s,y*s), radius = r, color=(0,1,9))
 
        tmp.append(disk)
    mylist.append(tmp)
nlat=10
mylist = []

for x in range(0,nlat):
    tmp = []

    for y in range(0,nlat):

        disk=sphere(pos=(x*s,y*s), radius = r, color=(0,1,9))

        tmp.append(disk)
    mylist.append(tmp)

et voila! An array of spheres.

Jeff

jrcagle

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Feb 22nd, 2009

Re: Convert python list to numpy array.

I was wanting to extract a list of x and y values from the list. I did it like this simply:

python Syntax (Toggle Plain Text)
x_list = []
y_list = []
for disk in array:
    x_list.append(disk.x)
    y_list.append(disk.y)
x_list = []
y_list = []
for disk in array:
    x_list.append(disk.x)
    y_list.append(disk.y)

Solved!

breatheasier

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