Problem 3.23 Write a MATLAB function that will take a (4 x 4) matrix as an input

Question

Problem 3.23

Write a MATLAB function that will take a (4 x 4) matrix as an input argument and will return a (4 x 1) array containing the averages of each of the four rows of the input matrix.

Example execution of 3.23:

indata323 =

1 2 3 4

5 6 7 8

9 10 11 12

13 14 15 16

>> lab4_323(indata323)

ans =

2.5000

6.5000

10.5000

14.5000

Hint: Matlab has a built-in sum function to sum the contents of an array row or column. From the command window, enter:

help sum

Use the format:

S = sum(X,DIM) sums along the dimension DIM.

For DIM specify the row and column of the array.

You can use the colon (:) operator for the row or column dimension to sum a row or column. See page 95. For example, to sum column 1 of an array:

column1sum = sum(array(:,1));

Explanation / Answer

clear all; clear screen;

x = input('enter the matrix elements')

rowsum(1,1) = sum(x(1,:))/4;

rowsum(2,1) = sum(x(2,:))/4;

rowsum(3,1) = sum(x(3,:))/4;

rowsum(4,1) = sum(x(4,:))/4;

disp('the averages of the rows are')

disp(rowsum)

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