# How to display values from a colorbar on surface?

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Daniel on 24 Feb 2012
Edited: Cedric Wannaz on 23 Oct 2013
Hi everyone, I'm plotting a surface that shows frequency of appearence of clusters, I added a colorbar to make it easier to understand, but I'm facing some problems:
1. Can the colorbar have a label? like "number of hours the phenomena appears"?
2. Can the actual value of the variable be displayed on the graphic. I mean, with colorbar I see colours on the graphic, that correspond to a certain scale. Apart from the colours, is it possible to display the value as it is possible to do with contours?
Thanks a lot everyone, I copy the code I'm using next:
HS=RPHs; TP=RPTpr;
validi=HS>0&HS<50&TP<50&TP>0;
TP=TP(validi); HS=HS(validi);
figure(77) subplot(3,1,1) plot(HS,'.-') subplot(3,1,2) plot(TP,'.') subplot(3,1,3) plot(HS,TP,'.')
max_H=6;max_P=18; DH=0.1;DP=0.5; NGH=max_H/DH;NGP=max_P/DP; PH=[NGH,NGP]; for gH=1:NGH for gP=1:NGP PH(gH,gP)=length(find(HS>=DH*(gH-1)&HS<DH*gH&TP>=DP*(gP-1)&TP<DP*gP)); end end [PP,HH] = meshgrid(DP:DP:max_P,DH:DH:max_H);
%% Calcolo potenze ed energia
PH=(PH)/(sum(sum(PH)))*24*365; % Per quante ore l'anno ho un dato stato di mare
LL=PP.^2*9.81/2/pi; %lunghezze d'onda %[HH,LL] = meshgrid(DH:DH:max_H,DL:DL:max_L);
POT=((HH.^2).*PP); % Potenza nel piano H-P POT_SPEC=(1000*9.81^2)/(64*pi)/1000*POT; % 64 e non 32 se è Hs (kW/m) Potenza con coefficienti (H non è HS)
DEN_POT_TOT=(POT_SPEC.*PH); % Energia su ogni cluster di onde EN_ONDA_ORA=sum(sum(DEN_POT_TOT));
POT_AV=EN_ONDA_ORA/24/365; POS=num2str(round(POT_AV*100)/100);
%% Faccio grafici energia
scrsz = get(0,'ScreenSize'); figure('Position',[0.1*scrsz(3), 0.25*scrsz(4), 0.6*scrsz(3), 0.6*scrsz(4)]); PPL=['Frequency of appearance of Hi-Tj pairs - Rio de la Plata 09-11']; % subplot(2,2,1:2) title([PPL]) surface(PP,HH,PH) xlabel('Peak Period (s)') ylabel('Significant Wave Height (m)') axis([PP(1,1) 12 HH(1,1) 5]); set(gca, 'PlotBoxAspectRatio',[1 1 1]); colorbar set(gcf,'Renderer','Zbuffer') print ('-djpeg', '-r300', [PPL,'. Scatter frequenze.jpg'])
% subplot(2,2,3) figure('Position',[0.1*scrsz(3), 0.25*scrsz(4), 0.6*scrsz(3), 0.6*scrsz(4)]); title({'Frequency of appearance of Hi-Tj pairs in hours';['Average Power every linear metre = ',POS,' kW/m']}) %surface(HH,LL,PH') surface(PP,HH,DEN_POT_TOT) xlabel('Peak Period (s)') ylabel('Significant Wave Height (m)') axis([PP(1,1) 12 HH(1,1) 5]); caxis([0 1000]) set(gca, 'PlotBoxAspectRatio',[1 1 1]); colorbar set(gcf,'Renderer','Zbuffer') print ('-djpeg', '-r300', [PPL,'. En-Periodo.jpg']) % % subplot(2,2,4) figure('Position',[0.1*scrsz(3), 0.25*scrsz(4), 0.6*scrsz(3), 0.6*scrsz(4)]); title(['Average Power every linear metre = ',POS,' kW/m']) surface(LL,HH,DEN_POT_TOT) xlabel('Wave Length (m)') ylabel('Significant Wave Height (m)') axis([LL(1,1) 400 HH(1,1) 5]);caxis([0 1000]) set(gca, 'PlotBoxAspectRatio',[1 1 1]); colorbar set(gcf,'Renderer','Zbuffer') print ('-djpeg', '-r300', [PPL,'. En-Lungh.jpg'])

#### 1 Comment

Tom on 24 Feb 2012
I can't run your code- RPHs and RPTpr are undefined.
But, for the first part of your question, try something like:
C=colorbar;
C_y=get(C,'ylabel');
set(C_y,'String','number of hours the phenomena appears')