Use inpolygon command for multiple polygon areas

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Tessa Kol
Tessa Kol el 18 de Sept. de 2020
Comentada: Tessa Kol el 19 de Sept. de 2020
Dear all,
I have some difficulty with assigning points into multiple square polygons. I have data files containing (x,y,z) coordinates of every particle. With the command inpolygon I locate the particles that are inside a specified polygon:
%% Loading the data
rhoPart = 2540;
files = dir(fullfile(uigetdir,'*.data*'));
[~,Index] = natsort({files.name});
files = files(Index);
expData = cell(length(files),1);
k = 1;
for i = 1:length(files)
fid = fopen(fullfile(files(i).folder,files(i).name),'r');
%% Reading the data
% Read all the data from the file
dataRead = textscan(fid,'%f %f %f %f %f %f %f %f %f %f %f %f %f %f','HeaderLines',1);
frewind(fid);
% Write headerline N, time, xmin, ymin, zmin, xmax, ymax, zmax
runData{k} = strsplit(fgetl(fid), ' ');
% Write only the x, y, and z components of the particles, particle radius,
% z component+ particle radius and volume of the particle
expData{k} = [dataRead{1}(:,1) dataRead{2}(:,1) dataRead{3}(:,1) dataRead{7}(:,1) dataRead{3}(:,1)+dataRead{7}(:,1) rhoPart*(4/3)*pi*(dataRead{7}(:,1).^3)];
% Write only the vx,vy,vz of the particles and magnitude
velData{k} = [dataRead{4}(:,1) dataRead{5}(:,1) dataRead{6}(:,1) sqrt(dataRead{4}(:,1).^2 + dataRead{5}(:,1).^2 + dataRead{6}(:,1).^2)];
fclose(fid);
k = k + 1;
end
%% Classify (into a structure)
% Number of simulation runs
N_run = 1;
% Number of .data files to be extracted of every simulation run
N_files = 2745;
k = 1;
for i = 1:N_run
for j = 1:N_files
runData_r{j,i} = str2double(runData{k});
expData_r{j,i} = expData{k};
velData_r{j,i} = velData{k};
k = k + 1;
end
end
% Polygon
xc = expData_r{1800,1}(:,1);
zc = expData_r{1800,1}(:,1);
xv = [-0.0184 -0.0061 -0.0061 -0.0184 -0.0184];
zv = [0.2857 0.2857 0.2755 0.2755 0.2857];
in = inpolygon(xc,zc,xv,zv);
figure
plot(xv,zv,'LineWidth',2)
hold on
plot(xc(in),zc(in),'r+')
I get the following results:
But I want to do this procedure for a whole mesgrid. Thus, locate the particles of every gridbin (i.e. multiple polygons). How can I do that?

Respuesta aceptada

KSSV
KSSV el 18 de Sept. de 2020
  8 comentarios
KSSV
KSSV el 18 de Sept. de 2020
Why do you think the indices are wrong?
Tessa Kol
Tessa Kol el 19 de Sept. de 2020
Everything is solved by now. I succesfully made a quiver plot. Thank you for you help!

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Más respuestas (1)

Matt J
Matt J el 18 de Sept. de 2020
Editada: Matt J el 18 de Sept. de 2020
Use discretize(),
Apply it separately to all of your xv's and then on all your zv's.

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