Question

please help with this simple MATLAB function

1 Grades Search function grade - searchGrade (name, scores.lab04) Input Type Description name 1xNchar a name in the scores lab04.mat file for- matted with last name followed by first name and no spaces or capitalization (see details) scores.lab04) Nx2 cell the name(s) and the score(s) in the scores.lab04.mat file Output Type Description grade 1x1 double The score recieved by name Details You happened to have acquired a file called scores lab04.mat with the names and scores of everyone in a class. The first column of the file contains all the names of the students in the class. The second column contains the corresponding grades of the students for that class. You want to look up the grade that a certain student has received in the class. You are to write a function that recursively searches for and returns the grade of a student. The name of the student whose grade you wish to look up must be entered in as a char array with the last name first and no spaces or capitalization. For example, Raja Sengupta would be 'senguptaraja'. Tips . You may notice the second input scores lab04 is a cell array, while you only download a mat file from bcourse( This document is purely fictitious. All scores in this file were generated using a random number generator.) We provide a skeleton code for you to start with. The skeleton code will check how many inputs you have. If you

Answer 1

As the .mat file was not given , created one for sample run and for some assumptions.

Code for .mat file creation

% create of sample .mat file for sample run

names = ['namea'; 'nameb'; 'namec'];

scores = randi(100, 3, 1);

% write to .mat file

save scores_lab04.mat names scores

% create of sample .mat file for sample run names = ['namea'; 'nameb'; 'namec']; scores = randi(100, 3, 1); % write to .mat file save scores_lab04.mat names scores

Assuming this file, the function searchGrade is written as follows. All the explanation is in the code comments. Hope this helps!

Code:

% sample run

clear

grade = searchGrade('nameb');

fprintf("Grade for student nameb = %d\n", grade);

grade = searchGrade('namex');

fprintf("Grade for student namex = %d\n", grade);

function grade = searchGrade(name, scores_lab04)

% check if there only one input

if(nargin == 1)

% load the data from .mat file

scores_lab04 = load("scores_lab04.mat");

end

% search for the name in all elements of the names

for i=1:size(scores_lab04.names, 1)

% compare names

if(strcmp(name, scores_lab04.names(i, :)))

grade = scores_lab04.scores(i);

return

end

end

% if name is not found

grade = -1;

end

Sample run:

Grade for student nameb = 14 Grade for student namex = -1

Code screenshots:

% sample run clear grade = searchGrade ('nameb'); fprintf("Grade for student nameb = %d\n", grade); grade = searchGrade('namex'); fprintf("Grade for student namex = %d\n", grade); function grade = searchGrade (name, scores_lab04) % check if there only one input if(nargin == 1) % load the data from .mat file scores_lab04 = load("scores_lab04.mat"); end % search for the name in all elements of the names for i=1:size(scores_lab04. names, 1) % compare names if(strcmp(name, scores_lab04. names (i, :))) grade = scores_lab04. scores (i); return end end % if name is not found grade = -1; end