Question

Create the following matrix M: 1 7 13 19 25 ?-3 9 15 21 27 5 11 17 2329By writing one command and using the colon to address range of elements (do not type individual elements explicitly), use the matrix M to: (a) Create a five-element row vector named Va that contains the elements of the third row of M. (b) Create a three-element column vector named Va that contains the elements of the fourth column of M. (c) Create an eight-element row vector named Vc that contains the elements of the second row of M followed by the elements of the third column of M.

Answer 1

Matlab code is:

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`M=reshape(1:2:29, 3,5)`

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`\% (a)`

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`Va=M(3,:)`

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`\% (b)`

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`Vb=M(:,4)`

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`\% (c)`

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`Vc=[M(2,:) M(:,3)']`

Step-by-step explanation:

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`\% \ Making\ the\ Matrix\ With\ required\ terms\ 1\ to\ 29\ with\ spaces\ of\ 5\ in\ three\ rows`

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`M=reshape(1:2:29, 3,5)`

`M =`

1 7 13 19 25

3 9 15 21 27

5 11 17 23 29

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`\% (a)`

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`\%\ Slicing\ M\ \ from\ third\ row\ till\ end`

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`Va=M(3,:)`

`Va =\\\ 5\ 11\ 17\ 23\ 29`

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`\% (b)`

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`\% \ Slicing\ the\4th\ column\ of\ M\ matrix\`

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`Vb=M(:,4)`

`Vb =\\ 19\\ 21\\ 23\\`

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`\% (c)`

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`\% \ slicing\ the\ 2nd\ row\ and\ 3rd\ column\ of\ M\ Matrix\ and\ combining\ them\ to\ make\ a\ row\ matrix`

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`Vc=[M(2,:) M(:,3)']`

`Vc =\\ 3\ 9\ 15\ 21\ 27\ 13\ 15\ 17`

>>

The code is tested and is correct. If you put a semi colon ' ; ' at the end of every statement then your answer will be calculated but matlab doesn't show it until you ask i.e. typing the variable (Va, Vb, Vc )and press enter.