MATLAB: Insert a colorbar into a plot, destroys image with too many numbers

colorbarerror

Hello,

I have a small problem with the colorbar function of matlab. Whenever I add a colorbar into a surfaceplot, that happens http://i.imgur.com/yHeJBW3.jpg

If I then start to move the plot, it looks like this http://i.imgur.com/8Fk3qM4.jpg

Does anyone know how to display the plot properly? This way, it is not realy publishable. I already googled, but I couldn't find anything (probably also because I don't know the right vocabularies to look for).

Hope someone can help me 🙂

[Edit: typos]

Best Answer

I am guessing this is a duplicate of http://www.mathworks.com/matlabcentral/answers/53874

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imshow() does not flip vertically. It uses the standard convention of the top line of the image being row #1. Totally standard. Not flipped. Everyone who deals with images does it this way.

Don't use pcolor for images. pcolor does something vastly different than imshow. You don't have the same number of "squares" for each pixel (it's one row short in each dimension) and the colors do not correspond to the image values but to the "tilt" of the square between the four corners (unless you use the flat shading option). Why would you want to use pcolor?

MATLAB: How to draw a graph with a colormap from a txt file

You can do that with e.g. surf or contourf . I would suggest surf because it works with datetime format, which you should use instead of datenum.

Here's a code adapted to your data

% Load data
data=xlsread('Soil misture.xlsx')
% Save depths, d, and remove this row
d=data(1,~isnan(data(1,:)));
data(1,:)=[];
% Save times, t, as datetime format
t=datetime(data(:,1),data(:,2),data(:,3));
% Save moisture content, u, as 2d matrix
u = data(:,4:end);
% Interpolate over time
ti = t(1):days(1):t(end);
ui = interp1(t,u,ti);
% Interpolate over depth
di = min(d):1:max(d);
uii = interp1(d,ui',di);
% plot
surf(ti,di,uii,'edgecolor','interp');
% some aestethics
ax=gca;
axis tight
view([0 90]);
cb = colorbar(gca,'location','southoutside');
cb.Label.String = 'Soil water content (cm^3/cm^3)';
ylabel('Soil depth (cm)');
xlabel('Time','fontweight','bold');
xtickformat('yyyy/MM/dd');
ax.XRuler.TickLabelRotation = 40;
ax.XRuler.TickDirection = 'out';
ax.YRuler.TickDirection = 'out';
ax.Layer = 'top';
ax.Color = 'none';
grid off
colormap(jet(20))

Best Answer

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MATLAB: Imshow / pcolor … inconsistent plotting

MATLAB: How to draw a graph with a colormap from a txt file

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