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Hey, if _\[A\]_ can be read in from a file, why not read _\[B\]_ from the same file?

Append the elements of _\[B\]_ to _input_data.txt_ and save the file:

{{\[ (0,0) (0,1) (0,2)...(0,m-1) \]}}

{{\[ (1,0) \____________________\_ \]}}

{{\[ (2,0) \____________________\_ \]}}

{{\[  ...   \______________________\_ \]}}

{{\[(n-1,0) \__________\_ (n-1,m-1)\]}}

Once again, edit _beam4.m_. Now, use the <span style="color: #660099"><strong><em>dlmread</em></strong></span> command with the delimiter and range inputs to extract both <span style="color: #660099"><strong><em>A</em></strong></span> and <span style="color: #660099"><strong><em>B</em></strong></span> at the same time. The delimiter should be '', the range should be {{\[0 0 1 1\]}} for <span style="color: #660099"><strong><em>A</em></strong></span> and {{\[2 0 3 0\]}} for <span style="color: #660099"><strong><em>B</em></strong></span>. Remember to add your semi-colons.