This document describes a MATLAB program that analyzes temperature data from Chicago and San Francisco. It finds: 1) The average temperature for each city. 2) The number of days above the average temperature for each city. 3) The number of days and dates where San Francisco's temperature was lower than Chicago's. 4) The number of days and dates where San Francisco and Chicago had the same temperature.

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Contents
Ex2B­2.
Ex2C­2.
clc
%----------------------------------------
% Program: Lab2.m
% Author: Carlos Pereyra
%----------------------------------------
Ex2B­2.
Program Purpose: Determine the quadratic roots of a second degree polynomial (ax^2+bx+c) with coefficients a,b,c.
clc
a=[1,2,3]; %set 1 (a,b,c)
b=[2,5,-3]; %set 2 (a,b,c)
c=[a;b]; %concatenation of 1 & 2
zed=size(c(:,1)); %find #of rows
fprintf('Exercise 2C-2:n')
fprintf('===============nn');
for i=1:zed(1,1) %rows
[z1,z2]=quadroots(c(i,:));
z1_R=real(z1);
z1_I=imag(z1);
z2_R=real(z2);
z2_I=imag(z2);
if z1_I==0 && z2_I==0
fprintf('tRoots: %1.0fx^2+%1.0fx+%1.0f=0n',c(i,1),c(i,2),c(i,3))
fprintf('t===================n')
fprintf('tx_1 = %1.2fn',z1_R)
fprintf('tx_2 = %1.2fnn',z2_R)
else
fprintf('tRoots: %1.0fx^2+%1.0fx+%1.0f=0n',c(i,1),c(i,2),c(i,3))
fprintf('t===================n')
fprintf('tx_1 = %1.2f+%1.2fin',z1_R,z1_I)
fprintf('tx_2 = %1.2f+%1.2finn',z2_R,z2_I)
end
end
Exercise 2C-2:
===============
Roots: 1x^2+2x+3=0
===================
x_1 = -1.00+1.41i
x_2 = -1.00+-1.41i

2. 11/8/2015 Lab2
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Roots: 2x^2+5x+-3=0
===================
x_1 = 0.50
x_2 = -3.00
Ex2C­2.
Program Purpose: Part a.) Find average temperature for each array Part b.) Find how many days the temperature was
above average for each city Part c.) Find how many days and the days when the temperature in San Francisco was lower
compared to Chicago Part d.) Find how many days, and the days when the temperature in San Francisco was the same in
Chicago.
clc
% List of Temperatures of Chicago during, August 2009
TCH=[75,79,86,86,79,81,73,89,91,86,81,82,86,88,89,90,82,84,81,79,73,69,73,79,82,72,66,71,69
,66,66];
% List of Temperatures of San Francisco, August 2009
TSF=[69,68,70,73,72,71,69,76,85,87,74,84,76,68,79,75,68,68,73,72,79,68,68,69,71,70,89,95,90
,66,69];
[avg1,avg2,high1,high2,dayLess,dateLess,dayEQ,dateEQ] = arrayAVG(TSF,TCH);
fprintf('Exercise 2C-2:n')
fprintf('===============nn');
fprintf('tPart A.)n')
fprintf('tAverage in SF: %2.3fn',avg1)
fprintf('tAverage in CHI: %2.3fnn',avg2)
fprintf('tPart B.)n')
fprintf('tNumber of Days - Above Average Temp. in SF: %2.fn',high1)
fprintf('tNumber of Days - Above Average Temp. in CHI: %2.fnn',high2)
fprintf('tPart C.)n')
fprintf('tNumber of Days - Temp. SF < Temp. CHI: %2.fn',dayLess)
fprintf('tDates: August,')
for N=1:length(dateLess)
fprintf('%2.f ',dateLess(N)')
end
fprintf('nn')
fprintf('tPart D.)n')
fprintf('tNumber of Days - Temp. SF = Temp. CHI: %2.fn',dayEQ)
fprintf('tDates: August,')
for N=1:length(dateEQ)
fprintf('%2.f ',dateEQ(N)')
end
fprintf('nn')
Exercise 2C-2:
===============
Part A.)
Average in SF: 74.548

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Average in CHI: 79.129
Part B.)
Number of Days - Above Average Temp. in SF: 11
Number of Days - Above Average Temp. in CHI: 16
Part C.)
Number of Days - Temp. SF < Temp. CHI: 23
Dates: August, 1 2 3 4 5 6 7 8 9 11 13 14 15 16 17 18 19 20 22 23 24 25 26
Part D.)
Number of Days - Temp. SF = Temp. CHI: 1
Dates: August,30
Published with MATLAB® R2015a