create a column vector 𝑡 containing the values in the first column of datafile in matlab

Assuming your datafile is a comma-separated text file, you can use the csvread function in Matlab to read the data into a matrix. Then you can extract the first column of the matrix and store it as a column vector. Here's the code:

main.m
data = csvread('datafile.csv');
t = data(:, 1);
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The csvread function reads the entire file into a matrix called data. The (:, 1) indexing syntax extracts the first column of the matrix and stores it as a column vector called t. You can replace 'datafile.csv' with the name of your actual data file.

Note that this assumes that the data file has a header row. If the first row of the file also contains data, you'll need to modify the indexing to skip the header row.