how to save coordinates in a text file?

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youssef hany
youssef hany 2022-9-15
回答： William Rose 2022-9-17
I've used ''inpolygon'' function and I want to save the red points in a txt file in form of 2 columns of x and y, for ex. :
-1.21 3.24
-1.56 3.52
how can I do that? I'm new to matlab :D
The inpolygon function:
B=readmatrix('points.txt');
xv=B(:,1)';yv=B(:,2)';
p=readmatrix('points1.txt');
xq=p(:,1)';yq=p(:,2)';
[in,on] = inpolygon(xq,yq,xv,yv);
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youssef hany
youssef hany 2022-9-17
编辑：youssef hany 2022-9-17
NO, that's not what I want. I used read matrix to read points from file and then I applied a function (inpolygon) that filters the input data, all I need is to save the filtered points in a text file @Rik
William Rose
William Rose 2022-9-17
@youssef hany, @Rik is offering a hint which sounds good to me. You said "that's not what I want", but since you want to "save the filtered points in a text file", @Rik is right (as usual).

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William Rose
William Rose 2022-9-17
Ran in:
@youssef hany,
I do not see the matrix of selected points which you want to save. Maybe that is the problem. Here is an example:
N=100; %total number of points
xq=rand(N,1); yq=rand(N,1);
xv=[.5 .9 .5 .1 .5];
yv=[.1 .5 .9 .5 .1];
in=inpolygon(xq,yq,xv,yv);
plot(xq,yq,'bo',xq(in),yq(in),'rx',xv,yv,'--r');
a=[xq(in),yq(in)];
writematrix(a,'a.txt')
Try that. It should save the coordinates of the selected points as a 2-column text file.

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