从结构中删除大于特定值的数据 [英] Remove data from struct bigger than a certain value

问题描述

我有一个结构，即<1x1 struct>，并且我正在尝试根据值在结构中编辑字段.该字段称为GeoDist_Actual，该结构称为GeoDist_str.字段GeoDist_Actual是<262792x1 double>，这是我试图使用的代码，以消除大于1.609344e + 05的值.

I have a struct, that's a <1x1 struct>, and I'm trying to edit a field in the struct based on the values. The field is called GeoDist_Actual and the struct is called GeoDist_str. The field GeoDist_Actual is a <262792x1 double>, and this is the code I was trying to use in order to get rid of the values that are greater than 1.609344e+05.

i =1;
for i=i:size(GeoDist_str.GeoDist_Actual)
    if GeoDist_str.GeoDist_Actual(i,1 > 1.609344e+05
    GeoDist_str.GeoDist_Acutal(i,1) = [];
    end
end

我如何附加或更改此代码，以使其按我的目标运行?我考虑过将所有值都设置为0，但是为了获得GPS值，进行反向Vincenty(球面)计算，我将不得不从中倒退，我想完全摆脱掉不符合if条件的值.

How would I append or alter this code in order to make it function like I'm aiming? I considered setting all the values to 0, but I'm going to have to go backwards from this in order to get back GPS values, doing a reverse-Vincenty(spherical) calculation, and I'd like to just completely get rid of the values that don't comply with the if condition.

如果我完全可以缩小问题的范围，请告诉我，并感谢您的提前帮助！

If I can narrow down the question at all, let me know, and thank you for your help in advance!

我注意到，当我更改该部分时

I've noticed that when I changed out the section

GeoDist_str.GeoDist_Actual(i,1) = []; 

对于

GeoDist_str.GeoDist_Actual(i,1) = 0;

它实际上并没有解决任何问题，相反，它没有访问结构"GeoDist_str"中的"GeoDist_Actual"字段，它只是创建了一个值为0的镜像字段.

It didn't actually solve anything, instead it didn't access the field "GeoDist_Actual" within the struct "GeoDist_str", it just created a mirror field with values of 0.

推荐答案

请考虑以下示例:

% a 10-by-1 vector
x = [1;2;3;4;5;6;7;8;9;10];

% remove entries where the value is less than five
x(x<5) = [];

这称为逻辑索引，无需循环.

This is called logical indexing, no need for loops.

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