store the second column of input.dat in a vector y in matlab
You can use the importdata function to read data from a file as a matrix, and then extract the second column to a vector using indexing. Here's an example code:
main.m
```
data = importdata('input.dat');
y = data(:, 2);
```
`y` will be a column vector containing the values from the second column of `input.dat`.