Surface plots inside loop
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Hi,
I am working on a code that approximates a general bivariate function using a piecewise linear bivariate function. I am able to retrieve the data and plot it, my code works as follows:
It plots one subdomain at a time, as a surface plot. The plot is put inside a loop and so during each, iteration a new subdomain is plotted.
The issue here is that the final plot is displayed with discontinuities as shown in the figure attached.
Kindly help me remove those discontinuities, so as to make the final plot solid or suggest any alternate idea that would work.
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KSSV
le 19 Août 2019
YOu can follow a samll demo code given here:
[X,Y,Z] = peaks(100) ;
surf(X,Y,Z)
%% Make surface discontinuous for demo
idx = meshgrid(10:10:100) ;
for i = 1:idx
Z(idx(:,i),:) = NaN ;
Z(:,idx(:,i)) = NaN ;
end
surf(X,Y,Z)
%% Have a continuous (x,y,z) data
idx = ~isnan(Z) ;
c = [X(idx) Y(idx) Z(idx)] ;
%% Make c continuous
x = c(:,1) ; y = c(:,2) ; z = c(:,3) ;
xi = linspace(min(x),max(x),100) ;
yi = linspace(min(y),max(y),100) ;
[X,Y] = meshgrid(xi,yi) ;
Z = NaN(size(X)) ;
% get nearest neighbors of new X, Y from (x,y)
idx = knnsearch([X(:) Y(:)],[x y]) ;
Z(idx) = z ;
%% fill gaps by interpolation
F = scatteredInterpolant(x,y,z) ;
idx = isnan(Z) ;
Z(idx) = F(X(idx),Y(idx)) ;
figure
surf(X,Y,Z)
YOu can also use griddata, fillgaps, fillmissing.
3 commentaires
Bruno Luong
le 20 Août 2019
Modifié(e) : Bruno Luong
le 20 Août 2019
Assuming your xdata and ydata are sorted. My code doest not make new resampling of x and y, or interpolation, I just stitch them together
% Read your data
xdata = xlsread('debug.xlsx','B1:U4');
ydata = xlsread('debug.xlsx','B6:U9');
X{1} = xdata(1,:); X{2} = xdata(2,:); X{3} = xdata(3,:); X{4} = xdata(4,:);
Y{1} = ydata(1,:); Y{2} = ydata(2,:); Y{3} = ydata(3,:); Y{4} = ydata(4,:);
F{1} = xlsread('debug.xlsx','B11:U30');
F{2} = xlsread('debug.xlsx','B32:U51');
F{3} = xlsread('debug.xlsx','B53:U72');
F{4} = xlsread('debug.xlsx','B74:U93');
% Stitching the sub-rectangule data
Xu = unique([X{:}]);
Yu = unique([Y{:}]);
Fu = nan(length(Yu),length(Yu));
for k=1:length(F)
[~,ix] = ismember(X{k},Xu);
[~,iy] = ismember(Y{k},Yu);
Fu(iy,ix) = F{k};
end
figure;
surf(Xu,Yu,Fu)
6 commentaires
Bruno Luong
le 20 Août 2019
load('datareqd.mat')
% Stitching the sub-rectangule data
Xu = unique([X{:}]);
Yu = unique([Y{:}]);
Fu = nan(length(Yu),length(Yu));
for k=1:length(F)
[~,ix] = ismember(X{k},Xu);
[~,iy] = ismember(Y{k},Yu);
Fu(iy,ix) = F{k};
end
Fu = fillmissing(Fu,'linear');
close all
surf(Xu,Yu,Fu)
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