I need help with this

How do I read a matrix of numbers from a file into my program, with the data arranged in rows and columns matlab.

[Ankit]

which file (xlsx, csv, mat etc)?

[Mia]

A text file.

Answer 1

[Star Strider]

See the documentation section on Data Import and Export and Data Import and Analysis.

Answer 2

[Image Analyst]

Try csvread() or dlmread() or readtable() or importdata().