I find there is some problem with the importdata function import data, there is some data without negative character?What is the reason?

I find there is some problem with the importdata function import data, there is some data without negative character?What is the reason?

The below is the code:

clc;clear all;

filec=importdata('xcood-020.txt');

data(:,1)=filec.data;

please see the data file attached. How to deal with it ?

Answer 1

[Image Analyst]

I don't know. I think maybe all the minus signs in the string on each line might be confusing it. Try readmatrix:

data = readmatrix('xcood-020.txt')