2D density plot with colorbar

Hi guys,

I have data which has produced a 2D plot as shown in the first figure.

How can I transform the above figure to appear like the one below?

Answer 1

[KSSV]

N = 100 ; 
x = linspace(0,2*pi,N)' ; 
y = sin(x) ; 

xi = linspace(min(x),max(x),N) ; 
yi = linspace(min(y)-1,max(y)+1,N) ; 
[X,Y] = meshgrid(xi,yi) ; 
Z = zeros(size(X)) ; 
idx = knnsearch([X(:) Y(:)],[x y]) ; 
Z(idx) = 1 ; 
Z(idx+1) = 1 ; 
Z(idx-1) = 1 ; 
pcolor(X,Y,Z)
shading interp
colorbar
colormap(jet)

[Farai Mahachi]

Thanks KSSV,

does this procedure work as well for plotting multiple images on the same plot using pcolour and hold on?

I have been trying that but cant seem to plot two or more plots on the same figure.

I basically took your code and assigned different variables.

N = 100 ; 
x = linspace(0,2*pi,N)' ; 
y = sin(x) ; 
xi = linspace(min(x),max(x),N) ; 
yi = linspace(min(y)-1,max(y)+1,N) ; 
[X,Y] = meshgrid(xi,yi) ; 
Z = zeros(size(X)) ; 
idx = knnsearch([X(:) Y(:)],[x y]) ; 
Z(idx) = 1 ; 
Z(idx+1) = 1 ; 
Z(idx-1) = 1 ; 
pcolor(X,Y,Z)
hold on
shading interp
colorbar

NN = 100 ; 
xx = linspace(0,2*pi,NN)' ; 
yy = cos(xx) ; 
xi1 = linspace(min(xx),max(xx),NN) ; 
yi1 = linspace(min(yy)-1,max(yy)+1,NN) ; 
[XX,YY] = meshgrid(xi1,yi1) ; 
ZZ = zeros(size(XX)) ; 
idx1 = knnsearch([XX(:) YY(:)],[xx yy]) ; 
ZZ(idx1) = 1 ; 
ZZ(idx1+1) = 1 ; 
ZZ(idx1-1) = 1 ; 

pcolor(XX,YY,ZZ)
shading interp
colorbar
colormap(jet)

But cant seem to plot two plots on the same figure.