Question

q1/Find the average temperature in Jeddah weekly period (Use FOR loop. Do not use sum and mean built in functions). A = [28 35 36 30 38 32 38]

q2/Use if condition to graph the relation y=f(x) where.(Use for, if and plot)

y= x+2x   0<= x <=3

y= 4x+2   4<= x <8

y= x^2 - 4 8< x <13

MATLAB

Answer 1

1. To find the average temperature in Jeddah, we execute the following commands in MATLAB -

A = [28 35 36 30 38 32 38];

% Initialize
Sum = 0;

% For Loop
for k = 1 : length(A);
fprintf('Element %d is: %0.1f \n', k, A(k));
% Accumulate the sum
Sum = Sum + A(k);
% Compute the running mean and print out.
fprintf('After element #%d, the sum = %.1f, and the mean = %.3f\n\n',...
    k, Sum, Sum/k);
end

This gives the average temperature as 33.857.

2. To plot the given conditional function, we execute the following commands -

x = 0:13;
for x=0:13
if x<4
     y(x+1) = x + 2*x;
elseif x>=4 && x<8
     y(x+1) = 4*x + 2;
else % convers the remaning possible x
     y(x+1)= x^2 - 4;
end
end
x = 0:13;
plot(x,y);
xlabel('x');
ylabel('f(x)');

We obtain the following plot -

2468 1024

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