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Read in \[A\] from a File

Instead of specifying _\[A\]_ within the program, let's give the user the option of reading it in from a text file called, say, _input_data.txt_.

Create a text file called _input_data.txt_ in your working directory with the elements of _\[A\]_, each row being on a separate line: !input_data.jpg!
Keep in mind that we have used whitespace to delimit (i.e. differentiate) the different numbers. We'll read in this data using the _dlmread_ command. Check the documentation by searching the help for *dlmread*.

Scroll down to look at the example under Remarks.

Consider the following statement:

A=dlmread('input_data.txt')

This will read in _\[A\]_ from the specified file. Let's test this at the command line before we add it to our program:

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Check A in the Workspace. Note that each line in the text file is interpreted as a matrix row.

We'll create a new program called beam4.m starting from beam3.m. Select beam3.m in the Editor. Select

Editor > File > Save As

Enter beam4.m for filename. Confirm that you are editing beam4.m. Comment out the original A specification statement and replace it with the above statement using dlmread. Add a semi-colon at the end of the statement.

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Save beam4.m. Run it from the command line.

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Read in \[B\] from a File

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