facing a PointLocation error while using ginput !

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Ano
Ano 2016-10-26
评论： Walter Roberson 2017-7-26
Hello! HELP PLEASE! I am using the PointLocation in my script but I keep getting this error 'Undefined function 'PointLocation' for input arguments of type double', knowing that the input is a point coordinates (x,y) obtained using 'ginput' function and a delaunay triangulation (DT) such that: T= PointLocation ( DT, x,y)
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Ano
Ano 2016-10-27
Yes, in my code it is with lower p but even though I still get the error !!
Walter Roberson
Walter Roberson 2016-10-27
Please show how you construct DT and call pointLocation

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Walter Roberson
Walter Roberson 2016-10-27
编辑：Walter Roberson 2017-7-25
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ABDUL REHMAN
ABDUL REHMAN 2017-7-26
编辑：Walter Roberson 2017-7-26
Thnaks again for your help, I m posting here my code, still getting error.
h=0.01;
L=0.10;
W=0.05;
Nx=17;
Ny=9;
Number=3;
epsilon=1e-6;
M=1;
for i=1:Nx+1
for j=1:Ny+1
X(M)=-L/2+(i-1)/Nx*L;
Y(M)=-W/2+(j-1)/Ny*W-epsilon*X(M);
M=M+1;
end
end
TRI = delaunayTriangulation([X',Y']);
t=TRI';
t(4,:)=0;
p=[X; Y; -h*ones(1,length(X))];
save plate p t
PatchNumber=[];
viewer plate; view(0,90); hold on
m=0;
while ~isempty(t)
m=m+1;
[xi,yi]=ginput;
TriangleNumber = pointLocation(TRI,xi,yi);
n=t(1:3,TriangleNumber);
PatchNumber= [PatchNumber TriangleNumber];
x= p(1,n);
y= p(2,n);
if isempty(xi|yi) break; end
fill(x,y,Color4)
clear xi yi
end
t(4,:)=3;
t(4,PatchNumber)=2;
save plate p t
with the delaunayTriangulation, the error is what I mentioned above.
"Error using delaunayTriangulation/subsasgn
Invalid arguments in indexing operation."
Error in...
"t(4,:)=0;"
When I use just delaunay it runs but gives error at pointLocation when I pick the points using ginput, with the input type double.
Walter Roberson
Walter Roberson 2017-7-26
It is meaningless to set the 4th column of a triangulation object.

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更多回答（1 个）

Ano
Ano 2016-10-28
the DT was constructed as it follow:
N=20; %Discretization parameter
L=50; % Length
for i=1:N+1 %descritisation
for j=1:N+1
X(i)=-L/2+(i-1)/N*L;
Y(j)=-L/2+(j-1)/N*L;
end
end
DT = delaunay(X,Y);
DTt=DT';
while ~isempty(DTt)
[x,y]=ginput(1);
T = pointLocation ( DT, x ,y);
end

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