Change color of symbols in Bloch sphere

[aaa aaa]

I want to change color of symbols in Bloch sphere. 

There are official examples to do this thing as bellow link, but they don't work.

http://qutip.org/docs/3.1.0/guide/guide-bloch.html

Concretely, I wrote bellow code as same as the examples.

from qutip import *

import numpy as np

from math import *

b = Bloch()

xp = [np.cos(th) for th in np.linspace(0, 2*pi, 20)]

yp = [sin(th) for th in np.linspace(0, 2*pi, 20)]

zp = np.zeros(20)

pnts = [xp, yp, zp]

b.add_points(pnts,'m') # <-- add a 'm' string to signify 'multi' colored points

b.show()

Usually, 'm' option in b.add_points(pnts,'m') works for multi color option, but it doesn't work with no error message. 

I also tried "b.add_points(pnts, meth='m')". 

Furthermore, I added points one by one by the command "b.add_points( )".

Usually, added points are shown in different color automatically as described in the examples.

But it also doesn't work with no error message.

However I can change color of vectors automatically as same as the examples.

How should I do?

I use qutip in follow conditions.

QuTiP Version:      3.1.0

Numpy Version:      1.11.1

Scipy Version:      0.18.0

Cython Version:     0.23.4

Matplotlib Version: 1.5.1

Fortran mcsolver:   False

scikits.umfpack:    False

Python Version:     2.7.12

Platform Info:      Windows (AMD64)

Installation path:  C:\Anaconda2\lib\site-packages\qutip

[Paul Nation]

There are the 'point_color' and 'vector_color' properties.

[aaa aaa]

Thank you for your answer. 

I know these properties. 

I think the 'point_color' property is correctly set because that when I tried 'print(b)' command, the output is 'point_color:     ['b', 'r', 'g', '#CC6600']'.

However the symbols are in same color blue, although shape of symbols are correctly changed. 

How should I do?

[polly]

I have the same error as this.  Is this a bug that is still present?  thanks

[Paul Nation]

I will look into this tonight.

-P

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[Paul Nation]

I get the exact same plot as the documentation.  

[polly]

thanks for your reply Paul.  Here is my code and output, showing that I don't get what you do:

from qutip import *

from scipy import * 

import numpy as np

b = Bloch()

b.clear()

xp = [np.cos(th) for th in np.linspace(0, 2*pi, 20)]

yp = [np.sin(th) for th in np.linspace(0, 2*pi, 20)]

zp = np.zeros(20)

pnts = [xp, yp, zp]

b.add_points(pnts,'m')

b.show()

....this code produces the attached figure.

I can also try to add two series of points, each series I would expect to have a different colour but they are both blue:

from qutip import *

from scipy import * 

import numpy as np

b = Bloch()

b.clear()

xp = [np.cos(th) for th in np.linspace(0, 2*pi, 20)]

yp = [np.sin(th) for th in np.linspace(0, 2*pi, 20)]

zp = np.zeros(20)

pnts = [xp, yp, zp]

b.add_points(pnts,'m')

xz = np.zeros(20)

yz = [np.sin(th) for th in np.linspace(0, pi, 20)]

zz = [np.cos(th) for th in np.linspace(0, pi, 20)]

pnts2 = [xz, yz, zz]

b.add_points(pnts2)

b.show()

bFig=b.fig

bFig.savefig('testFig2')

....which produces the second attached fig

Can you suggest any changes/things I should check?

Also, here is the result of print(b) showing that it should be cycling through colours

Bloch data:
-----------
Number of points:  2
Number of vectors: 0

Bloch sphere properties:
------------------------
font_color:      black
font_size:       20
frame_alpha:     0.2
frame_color:     gray
frame_width:     1
point_color:     ['b', 'r', 'g', '#CC6600']
point_marker:    ['o', 's', 'd', '^']
point_size:      [25, 32, 35, 45]
sphere_alpha:    0.2
sphere_color:    #FFDDDD
figsize:         [5, 5]
vector_color:    ['g', '#CC6600', 'b', 'r']
vector_width:    3
vector_style:    -|>
vector_mutation: 20
view:            [-60, 30]
xlabel:          ['$x$', '']
xlpos:           [1.2, -1.2]
ylabel:          ['$y$', '']
ylpos:           [1.2, -1.2]
zlabel:          ['$\\left|0\\right>$', '$\\left|1\\right>$']
zlpos:           [1.2, -1.2]

thanks!

[Paul Nation]

I still can not reproduce your problem.  I get multicolored points when I run the code that you attached.

-P

polly

April 1, 2017 at 21:02

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Paul Nation

March 21, 2017 at 21:44

I get the exact same plot as the documentation.  

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aaa aaa

September 30, 2016 at 12:22

I want to change color of symbols in Bloch sphere. 

There are official examples to do this thing as bellow link, but they don't work.

http://qutip.org/docs/3.1.0/guide/guide-bloch.html

Concretely, I wrote bellow code as same as the examples.

from qutip import *

import numpy as np

from math import *

b = Bloch()

xp = [np.cos(th) for th in np.linspace(0, 2*pi, 20)]

yp = [sin(th) for th in np.linspace(0, 2*pi, 20)]

zp = np.zeros(20)

pnts = [xp, yp, zp]

b.add_points(pnts,'m') # <-- add a 'm' string to signify 'multi' colored points

b.show()

Usually, 'm' option in b.add_points(pnts,'m') works for multi color option, but it doesn't work with no error message. 

I also tried "b.add_points(pnts, meth='m')". 

Furthermore, I added points one by one by the command "b.add_points( )".

Usually, added points are shown in different color automatically as described in the examples.

But it also doesn't work with no error message.

However I can change color of vectors automatically as same as the examples.

How should I do?

I use qutip in follow conditions.

QuTiP Version:      3.1.0

Numpy Version:      1.11.1

Scipy Version:      0.18.0

Cython Version:     0.23.4

Matplotlib Version: 1.5.1

Fortran mcsolver:   False

scikits.umfpack:    False

Python Version:     2.7.12

Platform Info:      Windows (AMD64)

Installation path:  C:\Anaconda2\lib\site-packages\qutip

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[Alex Pitchford]

Hi Polly,

I have not followed the thread all the way through, so apologies if you have already been through this, but I see you are using qutip 3.10. Is there any reason why you cannot upgrade to the latest 4.10?

Not saying that will fix this, but might be worth a try.

Alex

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Paul Nation

March 21, 2017 at 21:44

I get the exact same plot as the documentation.  

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[MM]

Hi Alex,

 I'm using qutip 4.10 yet have the same problem. I'm using ubuntu.

best
MM

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Paul Nation

March 21, 2017 at 21:44

I get the exact same plot as the documentation.  

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[polly]

Recently I got around to upgrading from V3.  I found that the problem had been resolved in the newer version:

QuTiP: Quantum Toolbox in Python
Copyright (c) 2011 and later.
A. J. Pitchford, P. D. Nation, R. J. Johansson, A. Grimsmo, and C. Granade

QuTiP Version:      4.2.0
Numpy Version:      1.13.3
Scipy Version:      1.0.0
Cython Version:     0.27.3
Matplotlib Version: 2.2.0
Python Version:     3.6.4
Number of CPUs:     4
BLAS Info:          INTEL MKL
OPENMP Installed:   False
INTEL MKL Ext:      True
Platform Info:      Windows (AMD64)