I have used mesh and interpolate to increase the resolution of a contour, but there should be a way to decimate the number of points also. Type "help mesh" on the matlab command prompt. Also try this link http://www.mathworks.com/help/matlab/ref/triscatteredinterp.html
Try this code:
[X,Y] = meshgrid([-2:.5:2]);
Z = X.*exp(-X.^2-Y.^2);
contour3(X,Y,Z,30)
grid off
view(-15,25)
colormap cool
figure
contour3(X(1:2:end,1:2:end),Y(1:2:end,1:2:end),Z(1:2:end,1:2:end),30)
grid off
view(-15,25)
colormap cool
Hope this helps.
Respected Mr. Grzegorz Knor .
Thank you for your valuable reply.
Actually I need to reduce and show the grid points in the contour plot using 3d matrix. Below is the give matlab code. please find.
sst=load('C:\My Documents\MATLAB\sst_mean.xls');
sst1=reshape(sst,[89 180 1909]);
lat=load('C:\My Documents\MATLAB\latitude.xls');
lon=load('C:My Documents\MATLAB\longitude.xls');
text_handle = clabel(C,h);
set(h,'ShowText','on','TextStep',get(h,'LevelStep')*5);
colormap cool;
Respected Mr.Ryan Mears
Thank you for your valuable reply.
Actually I need to reduce and show the grid points in the contour plot using 3d matrix. Below is the give matlab code. please find.
sst=load('C:\My Documents\MATLAB\sst_mean.xls');
sst1=reshape(sst,[89 180 1909]);
lat=load('C:\My Documents\MATLAB\latitude.xls');
lon=load('C:My Documents\MATLAB\longitude.xls');
text_handle = clabel(C,h);
set(h,'ShowText','on','TextStep',get(h,'LevelStep')*5);
colormap cool;
Can you attach Excel files and full code?
If I good understand your problem, the scatter3 function could be helpfull:
http://www.mathworks.com/help/matlab/ref/scatter3.html
Find the attachement of the data of the Excel sheets.
sst=load('C:\My Documents\MATLAB\sst_mean.xls');
sst1=reshape(sst,[89 180 1909]);
lat=load('C:\My Documents\MATLAB\latitude.xls');
lon=load('C:\My Documents\MATLAB\longitude.xls');
[C,h]=contourf(lon,lat,(sst1(:,:,100)),[-180:100:29840]);
text_handle = clabel(C,h);
set(h,'ShowText','on','TextStep',get(h,'LevelStep'));
set(text_handle,'BackgroundColor',[1 1 .6],'Edgecolor',[.7 .7 .7]);
colormap cool;
Maybe you can reduce not the data size, but "variability in the data". For example replace sst1(:,:,100) with:
tmp = sst1(:,:,100);
tmp(tmp>5000) =5000;
and plot your results with smaller number of contour lines:
[C,h]=contourf(lon,lat,tmp,[-180:200:29840]);
text_handle = clabel(C,h);
set(h,'ShowText','on','TextStep',get(h,'LevelStep'));
set(text_handle,'BackgroundColor',[1 1 .6],'Edgecolor',[.7 .7 .7]);
colormap cool;
Sir, got the result with limited number of grid points.
Thank you very much ..
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