将文件加载到MATLAB中

发布于 2025-02-08 19:27:54 字数 438 浏览 2 评论 0原文

我希望用户键入文件的名称和文件，而不是询问用户坐标点的数量，然后键入它们。

该文件看起来像这样：

1 2
4 6
7 3

这是获取用户输入的脚本的部分。如何向用户询问文件的名称并将其用作输入？

disp('This program performs a least-squares fit of an ');
disp('input data set to a straight line.');
n_points = input('Enter the number of input [x y] points: ');

for ii = 1:n_points
    temp = input('Enter [x y] pair: ');
    x(ii) = temp(1);
    y(ii) = temp(2);
end

原文

Instead of my script asking the user the number of coordinate points and then to type them, I wanted the user to type the name of a file and the file to be read.

The file looks like this:

1 2
4 6
7 3

This is the piece of the script that gets the user input. How can I ask the user the name of the file and use it as input?

disp('This program performs a least-squares fit of an ');
disp('input data set to a straight line.');
n_points = input('Enter the number of input [x y] points: ');

for ii = 1:n_points
    temp = input('Enter [x y] pair: ');
    x(ii) = temp(1);
    y(ii) = temp(2);
end

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情话墙 2025-02-15 19:27:54

您可以使用 uigetfile（uigetfile（）您的操作系统文件浏览器。

困难的方法：如果您希望用户手动键入文件名，则可以使用input：

file_name = input('Please type the file name', "s");

for 循环的侧面注释，在中>循环迭代的数量已知，在您的情况下n_points。而不是在循环中生长x y y ， preallocate 他们。这在很小的阵列上并没有太大的不同，但是如果您有成千上万的迭代，您会注意到大量减速。因此，在循环之前，调用x = zeros（n_points，1），对于y相同。最好是创建coordinates = zeros（n_points，2）并保存坐标（ii，:) = temp在循环中，保持坐标并减少金额变量。

You can use uigetfile(), which opens your OS's file browser.

The hard way: if you want the user to manually type the file name you can use input:

file_name = input('Please type the file name', "s");

Side note on your for loop, in a for loop the number of iterations is know, in your case n_points. Rather than growing x and y within the loop, preallocate them. This doesn't make much of a difference on very small arrays, but if you've got tens of thousands of iterations, you'll notice a significant slow-down. Thus, call x = zeros(n_points, 1), same for y, before the loop. Better even would be to create coordinates = zeros(n_points, 2) and save coordinates(ii,:) = temp within the loop, keeping your coordinates together and reducing the amount of variables.