Filtering a matrix via User Input

Question

MILLER BIGGELAAR 2020-4-1

0
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https://ww2.mathworks.cn/matlabcentral/answers/514475-filtering-a-matrix-via-user-input

评论： MILLER BIGGELAAR 2020-4-1

Hi guys,

I am trying to create a program that will get the user to select a file and then using the inputdlg command, select a specific set of a filters, then the program will plot the file (in this case 3 columns each with x amount of rows) but filter out the data the user has specified (eg. filtering the min and max limit of column 1 will delete the row corresponding and so on for each column).

[file,path] = uigetfile('*.txt');
if isequal(file,0)
    disp('User has selected Cancel.');
else
    disp(['User has selected ', fullfile(file)]);
end
Data = readmatrix(file);
Filtering_q = {'Enter Easting Filtering Minimum (m)',...
    'Enter Easting Filtering Maximum (m)',...
    'Enter Northing Filtering Minimum (m)',...
    'Enter Northing Filtering Maximum (m)'};
Filterlims = inputdlg(Filtering_q);
Eastingmin = str2num(Filterlims{1});
Eastingmax = str2num(Filterlims{2});
Northingmin = str2num(Filterlims{3});
Northingmax = str2num(Filterlims{4});
rows_to_delete_Eastingmin = find(Data(:,1)<Eastingmin);
rows_to_delete_Eastingmax = find(Data(:,1)>Eastingmax);
rows_to_delete_Northingmin = find(Data(:,2)<Northingmin);
rows_to_delete_Northingmax = find(Data(:,2)>Northingmax);
Data((rows_to_delete_Eastingmin):(rows_to_delete_Eastingmax):(rows_to_delete_Northingmin):(rows_to_delete_Northingmax),:) = [];
E = Data(:,1);
N = Data(:,2);
D = Data(:,3);
plot3(E, N, D, '.')

This is what I have so far and everything besides the filtering works.

I am using MATLAB 2019a.

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Mohammad Sami 2020-4-1

编辑：Mohammad Sami 2020-4-1

在 MATLAB Online 中打开

You can use OR '|' or AND '&' to combine your logical statements. you don't need to use find as matlab works directly with logical indexes.

rows_to_delete_Eastingmin = Data(:,1)<Eastingmin;
rows_to_delete_Eastingmax = Data(:,1)>Eastingmax;
rows_to_delete_Northingmin = Data(:,2)<Northingmin;
rows_to_delete_Northingmax = Data(:,2)>Northingmax;
r_del = rows_to_delete_Eastingmin | rows_to_delete_Eastingmax | rows_to_delete_Northingmin | rows_to_delete_Northingmax;
Data(r_del,:) = [];