viridis.m

function C = viridis(n)
%VIRIDIS  Compact viridis colormap (n×3). Works on any recent MATLAB.
%   C = VIRIDIS() returns 256 colors.
%   C = VIRIDIS(N) returns N colors.
%
% Stops taken from Matplotlib’s viridis and linearly interpolated.

if nargin==0 || isempty(n), n = 256; end
stops = [ ...
    0.267004, 0.004874, 0.329415;  % deep purple
    0.282327, 0.094955, 0.417331;
    0.253935, 0.265254, 0.529983;
    0.206756, 0.371758, 0.553117;
    0.163625, 0.471133, 0.558148;
    0.128729, 0.566949, 0.550556;
    0.134692, 0.658636, 0.517649;
    0.266941, 0.748751, 0.440573;
    0.477504, 0.821444, 0.318195;
    0.741388, 0.873449, 0.149561;
    0.993248, 0.906157, 0.143936]; % yellow-green

m = size(stops,1);
xi = linspace(1,m,n);
C  = [interp1(1:m,stops(:,1),xi,'linear')', ...
      interp1(1:m,stops(:,2),xi,'linear')', ...
      interp1(1:m,stops(:,3),xi,'linear')'];
C  = max(min(C,1),0); % clamp
end