Question

Please write in Matlab. Thanks!

Today you are going to pretend to be a detective working for an agency by interviewing suspects for a house robbery. The agency has obtained records of4 variables from 20 suspects and a number has been assigned to each suspect. This data is stored in a 20 by 5 matrix. You can download this matrix on blackboard and extract it form the file Problem5.mat. The format of the matrix is as follows:

Column 1: number assigned to the suspect
Column 2: height of each suspect (cm)
Column 3: weight of each suspect (kg)
Column 4: systolic blood pressure of each suspect (mmHg)Column 5: heart rate of each suspect (beats/min)

1. The agency has a fuzzy street cam video of an intruder escaping from the house. From the video, it was deduced that the thief is roughly 150 to 180 cm tall, and weighs between 60 to 80 kg. Create a new matrix called suspects which includes the suspects who meet the above characteristics. Store each suspect’s number, weight and height in the matrix suspects. Also create a vector called notasuspect containing ONLY the suspect number of those who do not meet the mentioned characteristics. (Hint: you can use for and if statements)

2. Tracesofadrugwerefoundattheincidentsite,suggestingthatthethiefmayhavehigh blood pressure. Edit the matrix suspects by deleting the all the information of the suspects whose blood pressure is lower than 120 mmHg. Add these deleted suspects to the notasuspect vector.

3. The heart rates of the suspects were monitored and recorded for a key question in the interview process. Those with accelerated heart rate were considered dishonest. Edit matrix suspects by deleting the subjects with heart rate lower than 140 beats/min.

   There should only be two suspects left. Display the result in the following format:

   “The most likely to be the thief are suspect N and M.”
   ...where N and M are the assigned numbers of the two remaining suspects

   1   169   93   115   140
   2   196   81   126   77
   3   100   97   134   72
   4   151   73   108   86
   5   182   63   102   74
   6   161   72   117   61
   7   172   64   105   96
   8   129   93   109   189
   9   192   61   145   96
   10   172   85   118   77
   11   154   82   111   84
   12   114   93   138   81
   13   137   68   105   84
   14   168   95   137   70
   15   144   74   123   72
   16   143   90   130   61
   17   162   72   107   72
   18   151   96   135   69
   19   165   73   132   144
   20   160   66   122   172

Answer 1

% Read the 20 by 5 matrix
load -ASCII Problem5.mat;

% Create the matrix suspect
% Size of the Problem5 matrix
[m, n] = size(Problem5);

% Loop through each value in the matrix
j = 1;
k = 1;
for i = 1:m
% Check for the height is between 60 and 80
if (Problem5(i, 2)>=150 && Problem5(i, 2)<= 180)
% Check for the weights of the suspects
if (Problem5(i, 3)>=60 && Problem5(i, 3)<= 80)
% Add the suspect in suspect matrix
suspect(j, :) = Problem5(i, :);
j = j+1;
  
% Create notasuspect vector
else
notasuspect(k) = i;
k = k+1;
end
  
else
notasuspect(k) = i;
k = k+1;
end
end

% delete all the information of the suspects whose blood pressure is lower
% than 120
for i = 1:length(suspect)
% Check for blood pressure
if suspect(i, 4) < 120
% Add the same to notasuspect vector
notasuspect(k) = suspect(i, 1);
k = k+1;
suspect(i, :) = 0;
end
end

% Delete the rows from suspect
suspect(~any(suspect, 2), :) = [];

% delete suspects with heart rate lower than 140
for i = 1:size(suspect, 1)
% Check for heart rate
if suspect(i, 5)<140
% Add the same to notasuspect vector
notasuspect(k) = suspect(i, 1);
k = k+1;
suspect(i, :) = 0;
end
end

% Delete the rows from suspect
suspect(~any(suspect, 2), :) = [];

% Display the matrcies created
disp('The most likely to be the thief are suspects');
disp(suspect);
disp('Suspect Numbers of Persons of Not Suspects');
disp(notasuspect);

Screenshot of Output: