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Added inverse matrix notation in Octave to MX3 #530

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Dec 20, 2024
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Added inverse matrix notation in Octave to MX3 #530

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40 changes: 37 additions & 3 deletions source/linear-algebra/source/04-MX/03.ptx
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@
<title>Warm Up</title>
<activity>
<introduction>
<p>
<task><p>
Which of the following matrices is invertible? Find the inverse for the one that is invertible.
<ol marker="A.">
<li>
Expand All @@ -32,8 +32,42 @@
</li>
</ol>
</p>
</introduction>
</activity>
</task>

<task>
<p>
Check your work using technology. Read the examples carefully, and
run them in the Octave cell below.
</p>
<p>
Recall the syntax for entering and multiplying matrices.
</p>
<cd>
A = [1 -1 0 ; -1 1 0 ; 1 0 1]
B = [1 -1 3 ; -1 1 -1 ; 1 0 2]
A*B
</cd>

<p>
To invert a matrix <m>A</m>, the syntax is
<cd>
inv(A)
</cd>
When you run this code, does it match your work from part (a)?
</p>
</task>
</introduction>
</activity>
<sage language="octave">
<input>
A = [1 -1 0 ; -1 1 0 ; 1 0 1]
B = [1 -1 3 ; -1 1 -1 ; 1 0 2]
A*B
inv(A)
inv(B)
</input>
</sage>

</subsection>

<subsection><title>Class Activities</title>
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