phasemap.m

function M = phasemap(varargin)
% phasemap returns or sets a cyclic colormap with a constant lightness profile
% appropriate for plotting phase.  This is the phase colormap from the cmocean package,
% which is described here: 
% 
% Thyng, K.M., C.A. Greene, R.D. Hetland, H.M. Zimmerle, and S.F. DiMarco. 
% 2016. True colors of oceanography: Guidelines for effective and accurate 
% colormap selection. Oceanography 29(3):9?13. 
% http://dx.doi.org/10.5670/oceanog.2016.66
% 
%% Syntax 
% 
%  phasemap
%  M = phasemap(N)
%  phasemap(...,'rad') 
%  phasemap(...,'deg') 
% 
%% Description
% 
% phasemap sets the current colormap to a 256-level phase map.  
%
% M = phasemap(N) returns an Nx3 matrix of RGB values for a phase colormap. 
%
% phasemap(...,'rad') sets axis limits of current colormap to caxis([-pi pi]).
%
% phasemap(...,'deg') sets axis limits of current colormap to caxis([-180 180]).
% 
%% Example 1: Radians: 
% % Imagine some phase map ph in radians, which we'll wrap with phasewrap: 
% 
% ph = phasewrap(2*peaks(900)); 
% imagesc(ph) 
% colorbar
% phasemap
% 
%% Example 2: N-levels of degrees: 
% % Imagine some phase map ph in degrees, which we'll wrap with phasewrap: 
% 
% ph = phasewrap(100*peaks(900),'degrees'); 
% imagesc(ph) 
% colorbar
% phasemap(12)
% phasebar('location','se')
% 
%% Author Info
% This function was written by Chad A. Greene of the University of Texas 
% at Austin's Institute for Geophysics (UTIG), May 2016. 
% http://www.chadagreene.com. 
% 
% RGB values are from Kristen Thyng's cmocean package, which is described 
% here: http://matplotlib.org/cmocean/.  We've also written about cmocean 
% for a peer-reviewed paper which came out in the journal Oceanography. If
% this colormap is useful for you, please do us a kindness and cite us: 
% 
% Thyng, K.M., C.A. Greene, R.D. Hetland, H.M. Zimmerle, and S.F. DiMarco. 
% 2016. True colors of oceanography: Guidelines for effective and accurate 
% colormap selection. Oceanography 29(3):9?13. 
% http://dx.doi.org/10.5670/oceanog.2016.66
% 
% See also phasewrap and phasebar. 


%% Set defaults: 

useRadians = true; 
N = 256; 

%% Parse inputs: 

if nargout==0
   
   % Try to automatically determine if current displayed data exist and are in radians or degrees: 
   if max(abs(caxis))>pi
      useRadians = false;
   else
      useRadians = true; 
   end
   
   % If no data are already displayed use radians: 
   if isequal(caxis,[0 1])
      useRadians = true; 
   end
end

tmp = isscalar(varargin); 
if any(tmp) 
   N = varargin{tmp}; 
end

tmp = strncmpi(varargin,'degrees',3); 
if any(tmp) 
   useRadians = false; 
end

%% Define RGB values
% These are from Kristen Thyng's cmocean package. 

M = [5.672433191540513508e-01 4.100182395068523444e-01 7.083093311283020221e-02
5.736953301772044211e-01 4.063138532087779420e-01 6.763640231601228403e-02
5.799480967447653290e-01 4.026276742797504915e-01 6.473393177099490137e-02
5.862172695866233463e-01 3.988330724695699492e-01 6.205458968303614181e-02
5.923144925108665415e-01 3.950439510462298576e-01 5.971205801157861842e-02
5.984111408418428812e-01 3.911540258605458176e-01 5.767411608227714787e-02
6.043424290206336202e-01 3.872685128597095350e-01 5.602885984725362173e-02
6.102730395075426362e-01 3.832795072149322024e-01 5.476296754995452903e-02
6.160285278727513081e-01 3.793045934655587259e-01 5.394141797415289569e-02
6.217946768383846301e-01 3.752152844285729927e-01 5.356325267543649710e-02
6.273981944803832533e-01 3.711339411256204812e-01 5.366088692600886473e-02
6.329634850050215311e-01 3.669706922951990746e-01 5.424568721283973965e-02
6.384108107505974683e-01 3.627845776164700942e-01 5.531730789006169408e-02
6.437627089659085922e-01 3.585593190882822023e-01 5.687403160453335244e-02
6.490458410279109636e-01 3.542732744485371232e-01 5.891870808260257081e-02
6.541890190896787471e-01 3.499849852073002587e-01 6.140802385263100654e-02
6.592788747503696145e-01 3.456223550919270138e-01 6.436753134213843430e-02
6.642461005174192801e-01 3.412442211863969677e-01 6.774174550344227996e-02
6.690819958208311657e-01 3.368604110213779812e-01 7.149835754351707706e-02
6.738554888085569461e-01 3.324082052078400351e-01 7.567487403043354766e-02
6.784905737890469801e-01 3.279583943075117247e-01 8.019026053099251317e-02
6.829905229231653108e-01 3.235105768774509949e-01 8.502570015729454811e-02
6.873973768055010591e-01 3.190238938082787246e-01 9.021504188680756764e-02
6.916667866641007523e-01 3.145441232419453059e-01 9.569860743379610124e-02
6.957922329372184800e-01 3.100809319167464606e-01 1.014568051402635063e-01
6.997776299670888100e-01 3.056329480851149860e-01 1.074875553773054770e-01
7.036357370628869567e-01 3.011877595522590711e-01 1.138098973510021372e-01
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7.142560749513957585e-01 2.881211307727623572e-01 1.342125762305202696e-01
7.174739941560477341e-01 2.838747035534406327e-01 1.414868318931639668e-01
7.205242830202237547e-01 2.796988374089715013e-01 1.489903050379454141e-01
7.233972835735811291e-01 2.756122552678655913e-01 1.567027299209689251e-01
7.260902290803170622e-01 2.716252424744705074e-01 1.646182356269083324e-01
7.286005794465572061e-01 2.677482802858139888e-01 1.727304060861980239e-01
7.309261576887562395e-01 2.639918300158962117e-01 1.810321892738678551e-01
7.330653870302871189e-01 2.603659015050753256e-01 1.895163786061728473e-01
7.350186794657903588e-01 2.568773938658681089e-01 1.981820666380681439e-01
7.367827869904646221e-01 2.535402047817919002e-01 2.070088577247218842e-01
7.383581933944027842e-01 2.503622696871710129e-01 2.159876612538133012e-01
7.397459704801194746e-01 2.473506448008883085e-01 2.251089093005075314e-01
7.409477672978027618e-01 2.445114018731244232e-01 2.343626473565274537e-01
7.419657814271449769e-01 2.418495533170682554e-01 2.437386318766578963e-01
7.428027162250009363e-01 2.393690074290438785e-01 2.532264286379571905e-01
7.434617280753010871e-01 2.370725520147589083e-01 2.628155072505718448e-01
7.439463672555698404e-01 2.349618648405441546e-01 2.724953230491475309e-01
7.442604955662253108e-01 2.330377131867389928e-01 2.822544938256838498e-01
7.444083109771580942e-01 2.312996623822202169e-01 2.920823711509678011e-01
7.443942345178126141e-01 2.297462095038382279e-01 3.019690621658213669e-01
7.442228242253035031e-01 2.283749886783954519e-01 3.119048996322280609e-01
7.438987278365055689e-01 2.271828522038071840e-01 3.218804798008250700e-01
7.434266406175144004e-01 2.261659565030307850e-01 3.318866918844731173e-01
7.428112685586756303e-01 2.253198503030483524e-01 3.419147402717135353e-01
7.420572968700177574e-01 2.246395628281664947e-01 3.519561606537970344e-01
7.411693634997024160e-01 2.241196901870717295e-01 3.620028311945611144e-01
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7.348798843643120637e-01 2.237166777905215120e-01 4.120358686970734263e-01
7.332813905831826462e-01 2.240310655045488208e-01 4.219601084098942301e-01
7.315786460893067833e-01 2.244622306283280966e-01 4.318432603708243778e-01
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7.278757902192694029e-01 2.256496284295224086e-01 4.514624116253083685e-01
7.258826732888272737e-01 2.263936401540491139e-01 4.611893704869291510e-01
7.237992011402827330e-01 2.272301345525115646e-01 4.708571564055735181e-01
7.216284690463036222e-01 2.281535065561967612e-01 4.804619650485102977e-01
7.193734270864984293e-01 2.291583678228772403e-01 4.900002903581174851e-01
7.170368791833915401e-01 2.302395605311605142e-01 4.994689200594377154e-01
7.146214817984472001e-01 2.313921682581480121e-01 5.088649304139889473e-01
7.121300712110125719e-01 2.326113615814442426e-01 5.181844726895714626e-01
7.095645191802300022e-01 2.338929647122393596e-01 5.274270250454293762e-01
7.069269088332329476e-01 2.352328934084947365e-01 5.365908280501098249e-01
7.042192497772316040e-01 2.366272849868884531e-01 5.456740589098282301e-01
7.014433942735369687e-01 2.380725388567397904e-01 5.546751290266969114e-01
6.986010335708933150e-01 2.395653172009881704e-01 5.635926726134320441e-01
6.956936866865383040e-01 2.411025487728192251e-01 5.724255550539750770e-01
6.927222115248060641e-01 2.426816864587864053e-01 5.811742593820377056e-01
6.896879229931356381e-01 2.443001105764274206e-01 5.898374988574298650e-01
6.865918014911074341e-01 2.459555424906482712e-01 5.984146270185066729e-01
6.834346456921173152e-01 2.476459602268146765e-01 6.069051304628041432e-01
6.802170668044646984e-01 2.493695974967287121e-01 6.153086083569707654e-01
6.769394825945098670e-01 2.511249427769637332e-01 6.236247501806896354e-01
6.736020505347796172e-01 2.529107709208097687e-01 6.318534591911313392e-01
6.702032268029198825e-01 2.547269081210946085e-01 6.399981954948240626e-01
6.667440181482768846e-01 2.565719542580951473e-01 6.480556766297400628e-01
6.632240032303863275e-01 2.584454084861053658e-01 6.560256306953086147e-01
6.596425384904228695e-01 2.603470198353451392e-01 6.639077331315591524e-01
6.559987514287347610e-01 2.622767870376229715e-01 6.717015744726071436e-01
6.522915338733621393e-01 2.642349583566807047e-01 6.794066263454738852e-01
6.485195352742859631e-01 2.662220313649069636e-01 6.870222057113775094e-01
6.446806025240062743e-01 2.682390430547165194e-01 6.945485065851293438e-01
6.407712044067549462e-01 2.702878635294215792e-01 7.019874685983423790e-01
6.367911507125239012e-01 2.723687210815862736e-01 7.093338316074968564e-01
6.327380807122843231e-01 2.744830916476992400e-01 7.165858102551939668e-01
6.286093641096192064e-01 2.766326937674883912e-01 7.237412561247542619e-01
6.244020959215076383e-01 2.788194857486135936e-01 7.307976115653572746e-01
6.201130919933868224e-01 2.810456617826825876e-01 7.377518617228360220e-01
6.157388853340158841e-01 2.833136467579401296e-01 7.446004848213658711e-01
6.112757235007779677e-01 2.856260894714388043e-01 7.513394007827567389e-01
6.067195673197314232e-01 2.879858538961362902e-01 7.579639183289200721e-01
6.020660912878182947e-01 2.903960081063858834e-01 7.644686807933391837e-01
5.973106860777335214e-01 2.928598104095548882e-01 7.708476109730414416e-01
5.924478666488723899e-01 2.953810018358738465e-01 7.770946054703944395e-01
5.874718273398599200e-01 2.979635029516978784e-01 7.832026524810360435e-01
5.823786412617427688e-01 3.006102519317957467e-01 7.891612643940841831e-01
5.771627200394546797e-01 3.033250182270930684e-01 7.949608965741956634e-01
5.718182588451700132e-01 3.061116287038831429e-01 8.005910315557441814e-01
5.663392645516818202e-01 3.089739250027142559e-01 8.060401374993888535e-01
5.607195914193257025e-01 3.119157138110425498e-01 8.112956338568207970e-01
5.549529855475957563e-01 3.149407094165454501e-01 8.163438666523304965e-01
5.490331394145471222e-01 3.180524679993645409e-01 8.211700962113627211e-01
5.429537578898111505e-01 3.212543132710714011e-01 8.257585005973195891e-01
5.367081743584852793e-01 3.245494976399965759e-01 8.300925055155035093e-01
5.302876326058616474e-01 3.279420696272150604e-01 8.341557801338073119e-01
5.236887893045435449e-01 3.314328654907214844e-01 8.379276125633778882e-01
5.169063460899447904e-01 3.350233559526123450e-01 8.413881804452462143e-01
5.099355929853703895e-01 3.387142672664584242e-01 8.445169634123261826e-01
5.027725725347598207e-01 3.425054625546620768e-01 8.472929342850022971e-01
4.954142602591064537e-01 3.463958234006226933e-01 8.496947959170987330e-01
4.878587595988513326e-01 3.503831358364098980e-01 8.517012656547067184e-01
4.801055083588288697e-01 3.544639856683631796e-01 8.532914075636400808e-01
4.721554923719734620e-01 3.586336687735280915e-01 8.544450102471590203e-01
4.640044749743072461e-01 3.628897608659185647e-01 8.551433986394967324e-01
4.556622651494331433e-01 3.672221012185919453e-01 8.553678849867077938e-01
4.471383276851411126e-01 3.716204653438348049e-01 8.551029025080878476e-01
4.384422744277990391e-01 3.760744076888676291e-01 8.543357673497274929e-01
4.295862071986853437e-01 3.805721840819369373e-01 8.530568872354411525e-01
4.205817729540208272e-01 3.851023944161593993e-01 8.512595016023745131e-01
4.114469045503038047e-01 3.896507488703780386e-01 8.489411196051931396e-01
4.022060497114997024e-01 3.942002477832268204e-01 8.461048966175331865e-01
3.928817094017691969e-01 3.987355949127092125e-01 8.427576180215047286e-01
3.834985523654112494e-01 4.032413019893585915e-01 8.389104772668918297e-01
3.740836020579017540e-01 4.077017739713900135e-01 8.345792042879973671e-01
3.646672169663981444e-01 4.121010163064194876e-01 8.297846549404398475e-01
3.552786781091737400e-01 4.164248241297358044e-01 8.245505460684040555e-01
3.459478747064330673e-01 4.206600190520577986e-01 8.189037829436274230e-01
3.367081015244690612e-01 4.247932282895754974e-01 8.128760845516961320e-01
3.275908439376793990e-01 4.288132465017488459e-01 8.065006765026215829e-01
3.186221457587909978e-01 4.327124829824056107e-01 7.998088272458536707e-01
3.098298271614847166e-01 4.364836390012560297e-01 7.928343311444766561e-01
3.012402910763991026e-01 4.401209996756487719e-01 7.856111406094337113e-01
2.928823313409779638e-01 4.436186871784305041e-01 7.781766034977661839e-01
2.847793948471887826e-01 4.469737539371314017e-01 7.705648357916961011e-01
2.769467007747948850e-01 4.501870831571345710e-01 7.628028303724243564e-01
2.694019299196109829e-01 4.532587645627866313e-01 7.549201981024484809e-01
2.621602390310989183e-01 4.561900001239682090e-01 7.469447502290214036e-01
2.552341461123000532e-01 4.589829673886487993e-01 7.389023362912160442e-01
2.486334450106276739e-01 4.616406826381265760e-01 7.308167439984587510e-01
2.423662314394859907e-01 4.641664308850603216e-01 7.227110939283054591e-01
2.364388695871720847e-01 4.665636310323913460e-01 7.146082501062388515e-01
2.308485415758319559e-01 4.688387341053135704e-01 7.065202838204042157e-01
2.255938839599332946e-01 4.709968473866177896e-01 6.984625903578935979e-01
2.206708265023217819e-01 4.730433385072548291e-01 6.904486767769802968e-01
2.160726675659729312e-01 4.749837571162059402e-01 6.824902568657742474e-01
2.117901806110671359e-01 4.768237675084572857e-01 6.745973531916734656e-01
2.078117520620332837e-01 4.785690914533750617e-01 6.667784017923048534e-01
2.041235496378702718e-01 4.802254602742371259e-01 6.590403559750543927e-01
2.007097189181233365e-01 4.817985751209007961e-01 6.513887865326223325e-01
1.975526046085452347e-01 4.832940743336505141e-01 6.438279764300510744e-01
1.946329918332628250e-01 4.847175068012891663e-01 6.363610086687176981e-01
1.919303619466051491e-01 4.860743102570944107e-01 6.289898465867946875e-01
1.894231569164997186e-01 4.873697935214787447e-01 6.217154063202443570e-01
1.870890463166731688e-01 4.886091217818528398e-01 6.145376215326621150e-01
1.849051913577256789e-01 4.897973040922220522e-01 6.074555008360708053e-01
1.828485011223850432e-01 4.909391823733177396e-01 6.004671785775045345e-01
1.808958771515883079e-01 4.920394212959531832e-01 5.935699598659075482e-01
1.790244436455807608e-01 4.931024985341831424e-01 5.867603608667124604e-01
1.772117616891990266e-01 4.941326949799630941e-01 5.800341455014857983e-01
1.754360269913468329e-01 4.951340846166410459e-01 5.733863597592738781e-01
1.736762515758797087e-01 4.961105238543395690e-01 5.668113648548980255e-01
1.719124306347093734e-01 4.970656402350968617e-01 5.603028704563300932e-01
1.701256963402829336e-01 4.980028205181701861e-01 5.538539691464678949e-01
1.682986669160662918e-01 4.989250963808533057e-01 5.474578820340219032e-01
1.664149064733197181e-01 4.998354730877956897e-01 5.411056294295618629e-01
1.644597156463551424e-01 5.007365672557706482e-01 5.347884863149882095e-01
1.624201076780373842e-01 5.016306791238075435e-01 5.284974569553574364e-01
1.602848864385326977e-01 5.025198058433570925e-01 5.222231535388160983e-01
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1.532232234951459993e-01 5.051724842338358723e-01 5.034020703832871035e-01
1.506341170297759435e-01 5.060552360210837097e-01 4.970950392165090492e-01
1.479251349064662491e-01 5.069381242363323326e-01 4.907540521606342243e-01
1.450989169821367275e-01 5.078211657594990935e-01 4.843686938332767977e-01
1.421610804711274656e-01 5.087040420049282474e-01 4.779286166356862542e-01
1.391204868117350002e-01 5.095861045039652426e-01 4.714236063620425576e-01
1.359895499317730627e-01 5.104663830048005169e-01 4.648436434523450234e-01
1.327845912322146715e-01 5.113435957613400307e-01 4.581789585308634893e-01
1.295262445313372923e-01 5.122161615629505782e-01 4.514200810916398354e-01
1.262399101195911255e-01 5.130822129532254250e-01 4.445578804842563181e-01
1.229555631631381596e-01 5.139397889872834302e-01 4.375821217122248252e-01
1.197103614797271343e-01 5.147863054564670859e-01 4.304858794552847701e-01
1.165471638531235532e-01 5.156190876837056791e-01 4.232614510628861515e-01
1.135154897666945939e-01 5.164352388982441644e-01 4.159014793262920673e-01
1.106718285206290120e-01 5.172316368920498730e-01 4.083990629543874373e-01
1.080796164815457927e-01 5.180049408378688547e-01 4.007477580736906742e-01
1.058087845385388415e-01 5.187515945922266392e-01 3.929415772123373007e-01
1.039347151626626997e-01 5.194678258709898300e-01 3.849749882596104622e-01
1.025359694379740783e-01 5.201499324230609567e-01 3.768393027599689638e-01
1.016935492416111697e-01 5.207935695646238594e-01 3.685305536972853790e-01
1.014861636581259607e-01 5.213941640446873027e-01 3.600451225619441531e-01
1.019864741263540875e-01 5.219469371865886886e-01 3.513789710355462725e-01
1.032573879600174327e-01 5.224467943632038480e-01 3.425286138069295050e-01
1.053486489718466201e-01 5.228882869876148032e-01 3.334912134806259920e-01
1.082944758843455979e-01 5.232655680556403954e-01 3.242647166459451946e-01
1.121126465502676472e-01 5.235723416856985502e-01 3.148480421610331259e-01
1.168080773882203272e-01 5.238019157845009710e-01 3.052357609469624200e-01
1.223851778388554135e-01 5.239470202573554003e-01 2.954047708042208953e-01
1.288112281029662742e-01 5.239987576746931719e-01 2.853827900944919116e-01
1.360562084538863015e-01 5.239482011263842942e-01 2.751760306766347641e-01
1.441051441567454128e-01 5.237851259274813875e-01 2.647689845875647596e-01
1.529337458740115119e-01 5.234977984931444839e-01 2.541648013875384415e-01
1.624797709886042218e-01 5.230749435633894606e-01 2.434144547473032216e-01
1.727628202070501939e-01 5.225005508142598343e-01 2.324837423146093873e-01
1.836989343202152236e-01 5.217627536881318528e-01 2.214609776488171700e-01
1.952977171051294425e-01 5.208432064756289837e-01 2.103468003936530550e-01
2.074630833256147500e-01 5.197310268323230842e-01 1.992559173422548402e-01
2.201804866465039145e-01 5.184088461339138032e-01 1.882360891676425896e-01
2.333258146567612767e-01 5.168714604143809233e-01 1.774406118077297145e-01
2.467881037119215581e-01 5.151165689450147855e-01 1.670111936474235337e-01
2.604357846291780465e-01 5.131495394379788078e-01 1.571028965071679384e-01
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2.876188391824692214e-01 5.086577674346561828e-01 1.395008019535278476e-01
3.008697529112238644e-01 5.061850478527918362e-01 1.320370980173991848e-01
3.137048873182943232e-01 5.036086579898598758e-01 1.255636295957552051e-01
3.260953799514536011e-01 5.009490735705195430e-01 1.200560783434582723e-01
3.379942414546169838e-01 4.982324891216243778e-01 1.154774348588594179e-01
3.493848946613353212e-01 4.954799141616709757e-01 1.117578580398684851e-01
3.602962205045775468e-01 4.927011375065428189e-01 1.088017440281668080e-01
3.707557362021778880e-01 4.899046162256747716e-01 1.065118926400932531e-01
3.807631298544894016e-01 4.871051876936182690e-01 1.047958357127047602e-01
3.903962780488588469e-01 4.842942108846688964e-01 1.035513612645985182e-01
3.996816423057455991e-01 4.814750885349466381e-01 1.026934005733520505e-01
4.086118231999155692e-01 4.786607467967835539e-01 1.021446830610131806e-01
4.172551136119685977e-01 4.758391896276191191e-01 1.018301287096897711e-01
4.256394099183998248e-01 4.730091323278173276e-01 1.016864378549218739e-01
4.337892663754943090e-01 4.701691892705471276e-01 1.016574178896643976e-01
4.417279681251333190e-01 4.673173285719916525e-01 1.016932874387579400e-01
4.494774245867361739e-01 4.644510027208682001e-01 1.017499507788620638e-01
4.570581245596661568e-01 4.615672570884231107e-01 1.017881641465586406e-01
4.644891347214414323e-01 4.586628194897153787e-01 1.017726540180271533e-01
4.717881280670202515e-01 4.557341737961458361e-01 1.016712192056216102e-01
4.789714327661078186e-01 4.527776202342287948e-01 1.014538260631735189e-01
4.860540949604466587e-01 4.497893245680554819e-01 1.010916883277608036e-01
4.930499512220878899e-01 4.467653579561612909e-01 1.005563084901952564e-01
4.999717077592871761e-01 4.437017289996793012e-01 9.981844399132347445e-02
5.068310239546541807e-01 4.405944094751862994e-01 9.884694646914210514e-02
5.136385973536989891e-01 4.374393556236486624e-01 9.760740246030363831e-02
5.204042456108760595e-01 4.342325278539159172e-01 9.606047462512840029e-02
5.271369778483794288e-01 4.309699136110089479e-01 9.415979602623703038e-02
5.338450429270207298e-01 4.276475613850701518e-01 9.184919276569031288e-02
5.405359345634145329e-01 4.242616390225810163e-01 8.905887705893447692e-02
5.472163220206374135e-01 4.208085375489562519e-01 8.570001281033132190e-02
5.538918588348998862e-01 4.172850538650798025e-01 8.165659961692531277e-02
5.605667990303634385e-01 4.136887034926055584e-01 7.677269383879334330e-02
5.672433191540513508e-01 4.100182395068523444e-01 7.083093311283020221e-02];

%% Interpolate if necessary: 
% Because this map is cyclic, getting even spacing for the wrap-around requires
% adding an N for interpolation, then discarding the last value.   

if N~=256
   R = interp1(1:256,M(:,1),linspace(1,256,N+1)'); 
   G = interp1(1:256,M(:,2),linspace(1,256,N+1)'); 
   B = interp1(1:256,M(:,3),linspace(1,256,N+1)'); 
   M = [R(1:end-1) G(1:end-1) B(1:end-1)]; 
end
   

%% Clean up 

if nargout==0 
   
   % Set colormap: 
   colormap(M)
   
   % Set caxis: 
   if useRadians
      caxis([-pi pi])
   else
      caxis([-180 180])
   end
   
   clear M
end
   

end