[Answer]-How do i map a a vector of numbers to colors in python?

by

1👍

You may use the following code:

from __future__ import division

import numpy
import matplotlib.cm as cmap

r = numpy.random.rand(1000)                             #random numbers
c = cmap.jet(numpy.int_((r-r.min())/r.ptp()*255))       #colors

so you try:

>>> r
array([ 0.88741281,  0.61022571,  0.14819983,  0.3695846 ,  0.73832029,
        0.6266069 ,  0.6917337 ,  0.09162752,  0.83532511,  0.54001574, ...,])
>>> c
array([[ 1.        ,  0.08787219,  0.        ,  1.        ],
       [ 0.83175206,  1.        ,  0.13598988,  1.        ],
       [ 0.        ,  0.08039216,  1.        ,  1.        ],
       ..., 
       [ 0.        ,  0.72352941,  1.        ,  1.        ],
       [ 0.24984187,  1.        ,  0.71790006,  1.        ],
       [ 1.        ,  0.45098039,  0.        ,  1.        ]])

which are colors each row in the format of RGBA.

👤Developer

0👍

you can also give a look at ColorConverter. It provides a few methods to convert valid matplotlib colors to RGB or RGBA.

Valid matplotlib colors are

  1. a letter from the set ‘rgbcmykw’
  2. a hex color string, like ‘#00FFFF’
  3. a standard name, like ‘aqua’ a float, like ‘0.4’, indicating gray on
  4. a 0-1 scale
👤Francesco Montesano

Leave a comment