 # 3D scatter plot with 'unlimited' Z axis

Hey everyone,

I'm looking into a 3D scatter plot - basically converting a NumPy array
to a 3D plot, where X and Y correspond to the X and Y co-ordinates on
the graph and the Z values corresponds to a particular height on the graph.

This is how I'm generating the lists:

x = list(range(0, 256))
y = list(range(0, 256))
z = []

for i in range(0, 255):
for j in range(0, 255):
z.append(ll[i][j])

where ll is my 2D array...

I've seen the scatter function with 3d projection, but this requires the
Z array length to be the same length as the X and Y lengths, whereas
I'll need to be plotting X*Y points (256*256). Is there some way that I
could achieve this?

Thanks,

Will.

``````x = np.arange(256)
y = np.arange(256)
xx, yy = np.meshgrid(x, y)
``````

Then your `xx` and `yy` will be 2D, just like your `ll` variable. Then, you
pass the flattened versions of those three variables (i.e., `xx.flatten()`
or `xx.flat`) to the 3d scatter call.

I hope that helps!
Ben Root

···

On Mon, Oct 1, 2018 at 3:47 PM Will Furnell <mail at willfurnell.com> wrote:

Hey everyone,

I'm looking into a 3D scatter plot - basically converting a NumPy array
to a 3D plot, where X and Y correspond to the X and Y co-ordinates on
the graph and the Z values corresponds to a particular height on the graph.

This is how I'm generating the lists:

x = list(range(0, 256))
y = list(range(0, 256))
z = []

for i in range(0, 255):
for j in range(0, 255):
z.append(ll[i][j])

where ll is my 2D array...

I've seen the scatter function with 3d projection, but this requires the
Z array length to be the same length as the X and Y lengths, whereas
I'll need to be plotting X*Y points (256*256). Is there some way that I
could achieve this?

Thanks,

Will.
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Hello Ben,

Thank you very much, this works perfectly for me!

Best,

Will.

···

On 01/10/2018 21:10, Benjamin Root wrote:

``````x = np.arange(256)
y = np.arange(256)
xx, yy = np.meshgrid(x, y)
``````

Then your `xx` and `yy` will be 2D, just like your `ll` variable. Then,
you pass the flattened versions of those three variables (i.e.,
`xx.flatten()` or `xx.flat`) to the 3d scatter call.

I hope that helps!
Ben Root

On Mon, Oct 1, 2018 at 3:47 PM Will Furnell <mail at willfurnell.com > <mailto:mail at willfurnell.com>> wrote:

Hey everyone,

I'm looking into a 3D scatter plot - basically converting a NumPy array
to a 3D plot, where X and Y correspond to the X and Y co-ordinates on
the graph and the Z values corresponds to a particular height on the
graph.

This is how I'm generating the lists:

x = list(range(0, 256))
y = list(range(0, 256))
z = []

for i in range(0, 255):
? ? for j in range(0, 255):
? ? ? ? z.append(ll[i][j])

where ll is my 2D array...

I've seen the scatter function with 3d projection, but this requires the
Z array length to be the same length as the X and Y lengths, whereas
I'll need to be plotting X*Y points (256*256). Is there some way that I
could achieve this?

Thanks,

Will.
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org <mailto:Matplotlib-users at python.org>
https://mail.python.org/mailman/listinfo/matplotlib-users