How to solve Error - Index in position 1 is invalid. Array indices must be positive integers or logical values.

Question

hanif hamden 2020-11-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/664748-how-to-solve-error-index-in-position-1-is-invalid-array-indices-must-be-positive-integers-or-logi

评论： Stephan 2020-11-28

Hi, i wonder what is the problem with the script as the error showed like this "Index in position 1 is invalid. Array indices must be positive integers or logical values."

This is the script that I run:

clc;clear all;close all;
A1 = load('Mtxj_FULL_ASCENDING.txt');
A2 = load('Mtxj_FULL_DESCENDING.txt');
B1 = load('N2j1c_FULL_ASCENDING.txt');
B2 = load('N2j1c_FULL_DESCENDING.txt');
offset = 0;
A = [A1;A2];
B = [B1;B2];
B = [B(:,1:8) B(:,9)+offset B(:,10:end)];
lat1 = A(:,1);  lat2 = B(:,2);
lon1 = A(:,2);  lon2 = B(:,3);
mss1 = A(:,4);  mss2 = B(:,9);
scatter(lon1,lat1,'.r');hold on;
scatter(lon2,lat2,'.b');hold on;
F = scatteredInterpolant(B(:,2), B(:,3), (1:size(B,1)).', 'nearest');
A_is_nearest_idx = F( A(:,1:2) );
B_closest_to_A = B(A_is_nearest_idx,:);

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Answer 1

Stephan 2020-11-27

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/664748-how-to-solve-error-index-in-position-1-is-invalid-array-indices-must-be-positive-integers-or-logi#answer_557798

编辑：Stephan 2020-11-27

在 MATLAB Online 中打开

A1 = load('Mtxj_FULL_ASCENDING.txt');
A2 = load('Mtxj_FULL_DESCENDING.txt');
B1 = load('N2j1c_FULL_ASCENDING.txt');
B2 = load('N2j1c_FULL_DESCENDING.txt');
offset = 0;
A = [A1;A2];
B = [B1;B2];
B = [B(:,1:8) B(:,9)+offset B(:,10:end)];
lat1 = A(:,1);  lat2 = B(:,2);
lon1 = A(:,2);  lon2 = B(:,3);
mss1 = A(:,4);  mss2 = B(:,9);
scatter(lon1,lat1,'.r');hold on;
scatter(lon2,lat2,'.b');hold on;
F = scatteredInterpolant(B(:,2), B(:,3), (1:size(B,1)).', 'nearest');
A_is_nearest_idx = F( A(:,1:2) );
% Your data is corrupt at least at pos. 2240 and 3121 - convert to integer
% data type, to fix the error
A_is_nearest_idx = uint16(A_is_nearest_idx);
B_closest_to_A = B(A_is_nearest_idx,:);