Question

Need help on this Matlab problem, I do not know how to do it

Problem 2. (2D Sorting) The following table contains the scores for the 4 students A,B.C and D for four Homeworks HW1 50 20 85 65 HW2HW 45 80 30 95 HW4 75 35 15 80 Student A Student B Student C Student D 40 60 100 a) Create a matrix with the above data b) What is the minimum score of all four homework? (use the min function) c) Who is the student with the minimum score over all 4 homework assignments? d) For which homework did the student C got the minimum score e) Calculate the standard deviation and mean of the scores for each homework. f) Calculate the standard deviation and mean of the scores for each student g) Find the minimum score for each exam without using the function min) and create the following output. [20,30,15,40] h) For each exam sort the score in descending order, i.e. from high to low, to obtain the following Matrix 85 95 80 100 65 80 75 60 50 45 35 55

Answer 1

Note: Some time Matlab shows an error, index exceeds, if this type error happens when you run the program then close the Matlab IDE, after that run the fresh Matlab then copy and paste the program on Matlab terminal.

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Matlab code with Sample output:

>> % a) Create a matrix with the above data creatematrixdata = [50 45 75 55;20 80 35 40:85 30 15 60;65 95 80 100) creatematrixdata = 50 20 85 65 45 80 30 95 75 35 15 80 55 40 60 100

>> $ Create a matrix with the above data creatematrixdata = [50 45 75 55;20 80 35 40;85 30 15 60;65 95 80 100); $% b) The minimum score of all four homework $$ using the min function (minimumScore, studentminimumscore] =min (min(creatematrixdata)); $% Display the minimum score of all four homework. fprintf("Minimum score of all four homework: %d\n',minimumScore) Minimum score of all four homework: 15

>> $ Create a matrix with the above data creatematrixdata = [50 45 75 55;20 80 35 40;85 30 15 60;65 95 80 100); $% b) The minimum score of all four homework $$ using the min function [minimumScore, studentminimumscore] =min (min(creatematrixdata)); $% Display the minimum score of all four homewor $fprintf ("Minimum score of all four homework: %d\n',minimumScore) $% c) Display that student with the minimum $$ score overall assignment fprintf('Student with the minimum score:') $$ Check the condition whose score is $$ minimum $$ when minimum score is in row 1 if studentminimumscore==1 $than display the student A fprintf('Student A\n') $% otherwise when student minimum score is in row 2 elseif studentminimumscore==2 $% than display the student B fprintf('Student B\n') $$ otherwise when student minimum score is in row 3 elseif studentminimumscore==3 % than display the student C fprintf('Student C\n') $% otherwise when student minimum score is in row 4 elseif studentminimumscore==4 $% than display the student D fprintf('Student D\n') $% end of the ifelse statement end Student with the minimum score: Student C

>> $% d) Display the minimum score for which HW $$ student C got the minimum score (-, hw]=min(creatematrixdata (3,:)); %% Display the student homework number fprintf('Student C got the minimum score for homework HW%d\n', hw) Student C got the minimum score for homework HW3

>> $8 e) Calculate the standard deviation of the $$ scores for each homework % % Display the score for each homework fprintf('Standard deviation of the score for each homework:') %% Compute the standard deviation disp(std(creatematrixdata)) %% Display the mean of the scores for each homework fprintf('Mean of the score for each homework:') $$ Compute the mean of the score for each homework disp (mean (creatematrixdata)) Standard deviation of the score for each homework: 27.3861 30.1386 31.4576 25.6174 Mean of the score for each homework: 55.0000 62.5000 51.2500 63.7500

>> $$ £) Calculate the standard deviation of the 3% scores for each student $% Display the score for each student fprintf ("Standard deviation of the score for each student:\n') %% Compute the standard deviation disp(std(creatematrixdata')') $$ Display the mean of the scores for each student fprintf('Mean of the score for each student:\n') %% Compute the mean of the score for each student disp (mean (creatematrixdata')') Standard deviation of the score for each student: 13.1498 25.6174 31.2250 15.8114 Mean of the score for each student: 56.2500 43.7500 47.5000 85.0000

>> % g) find the minimum score for each exam without %% using the min() function and create the output %% declare the creatematrixdata Creatematrixdata = [50 45 75 55;20 80 35 40;85 30 15 60;65 95 80 100); % loop to access the create matrix length for msd=1:length (creatematrixdata (1,:)); % compute the minimum score minimumscore (msd)= creatematrixdata (1, msd); % loop to compute the next column data for ksd=2:length (creatematrixdata (:,1)); $check out the condition if (minimumscore (msd) > creatematrixdata (ksd,msd)) minimumscore (msd)= creatematrixdata (ksd, msd); end end end %display the result of minimum score minimumscore minimumscore = 20 30 15 40

>> * h) For each exam sort the score in descending order from low to high with contain the indices % of the matrix [BI] - sort (creatematrixdata, 'descend') 85 65 50 20 95 80 45 30 80 75 35 15 100 60 55 40 WEN WNE

>> $8 i) obtain the following output using Reshape reshape (creatematrixdata, [2,8]) ans - 20 85 65 45 80 30 95 75 155560 35 8040 100

Simple program screenshot by given order:

% a) Create a matrix with the above data creatematrixdata = [50 45 75 55; 20 80 35 40;85 30 15 60; 65 95 80 100); %% b) The minimum score of all four homework %% using the min function [minimumScore, studentminimumscore] =min (min(creatematrixdata )); %% Display the minimum score of all four homework. fprintf('Minimum score of all four homework: %d\n',minimumScore) % % c) Display that student with the minimum 8% score overall assignment fprintf('Student with the minimum score: ") %% Check the condition whose score is 8% minimum 8% when minimum score is in row 1 if studentminimumscore==1 8% than display the student A fprintf('Student An') %% otherwise when student minimum score is in row 2 elseif studentminimumscore==2 8% than display the student B fprintf('Student B\n') %% otherwise when student minimum score is in row 3 elseif studentminimumscore==3 8% than display the student C fprintf('Student C\n') %% otherwise when student minimum score is in row 4 elseif studentminimumscore==4 %% than display the student D fprintf('Student D\n') %% end of the ifelse statement end %% d) Display the minimum score for which HW 8% student C got the minimum score

[-,hw]=min (creatematrixdata (3,:)); 8% Display the student homework number fprintf('Student C got the minimum score for homework HW%d\n', hw) 8% e) Calculate the standard deviation of the %% scores for each homework %% Display the score for each homework fprintf('Standard deviation of the score for each homework: ') 8% Compute the standard deviation disp (std (creatematrixdata)) %% Display the mean of the scores for each homework fprintf('Mean of the score for each homework: ') 8% Compute the mean of the score for each homework disp (mean (creatematrixdata)) 88 f) Calculate the standard deviation of the %% scores for each student %% Display the score for each student fprintf('Standard deviation of the score for each student:\n ') %% Compute the standard deviation disp (std (creatematrixdata')') 8% Display the mean of the scores for each student fprintf('Mean of the score for each student:\n') 8% Compute the mean of the score for each student disp (mean (creatematrixdata')') %% g) find the minimum score for each exam without %% using the min() function and create the output %% declare the creatematrixdata Creatematrixdata = [50 45 75 55;20 80 35 40; 85 30 15 60;65 95 80 100); % loop to access the create matrix length for msd=1:length(creatematrixdata (1,:)); 8 compute the minimum score minimumscore (msd) = creatematrixdata (1,msd); % loop to compute the next column data

for ksd=2:length(creatematrixdata (:,1)); & check out the condition if (minimumscore (msd) > creatematrixdata (ksd, msd)) minimumscore (msd) = creatematrixdata (ksd, msd); end end end % display the result of minimum score minimumscore %% h) For each exam sort the score in descending & order from low to high with contain the indices % of the matrix [B, I] = sort (creatematrixdata, 'descend'). 8% i) obtain the following output using Reshape reshape (creatematrixdata, [2,8]).

Note: You can use this program individually as like the above-provided screenshot, if you wanna. I'm provide combine code of all the given requirements.

Code to copy:

% a) Create a matrix with the above data

creatematrixdata = [50 45 75 55;20 80 35 40;85 30 15 60;65 95 80 100]

%% b)The minimum score of all four homework

%% using the min function

[minimumScore,studentminimumscore]=min(min(creatematrixdata));

%% Display the minimum score of all four homework.

fprintf('Minimum score of all four homework: %d\n',minimumScore)

%% c) Display that student with the minimum

%% score overall assignment

fprintf('Student with the minimum score: ')

%% Check the condition whose score is

%% minimum

%% when minimum score is in row 1

if studentminimumscore==1

    %% than display the student A

    fprintf('Student A\n')

   

%% otherwise when student minimum score is in row 2

elseif studentminimumscore==2

    %% than display the student B

    fprintf('Student B\n')

   

%% otherwise when student minimum score is in row 3

elseif studentminimumscore==3

    %% than display the student C

    fprintf('Student C\n')

   

%% otherwise when student minimum score is in row 4

elseif studentminimumscore==4

   

    %% than display the student D

    fprintf('Student D\n')

%% end of the ifelse statement

end

%% d) Display the minimum score for which HW

%% student C got the minimum score

[~,hw]=min(creatematrixdata(3,:));

%% Display the student homework number

fprintf('Student C got the minimum score for homework HW%d\n',hw)

%% e) Calculate the standard deviation of the

%% scores for each homework

%% Display the score for each homework

fprintf('Standard deviation of the score for each homework: ')

%% Compute the standard deviation

disp(std(creatematrixdata))

%% Display the mean of the scores for each homework

fprintf('Mean of the score for each homework: ')

%% Compute the mean of the score for each homework

disp(mean(creatematrixdata))

%% f) Calculate the standard deviation of the

%% scores for each student

%% Display the score for each student

fprintf('Standard deviation of the score for each student:\n ')

%% Compute the standard deviation

disp(std(creatematrixdata')')

%% Display the mean of the scores for each student

fprintf('Mean of the score for each student:\n ')

%% Compute the mean of the score for each student

disp(mean(creatematrixdata')')

%% g) find the minimum score for each exam without

%% using the min() function and create the output

% loop to access the create matrix length

for msd=1:length(creatematrixdata (1,:));

    % compute the minimum score

    minimumscore(msd)= creatematrixdata (1,msd);

    % loop to compute the next column data

    for ksd=2:length(creatematrixdata (:,1));

         % check out the condition

         if(minimumscore (msd)> creatematrixdata (ksd,msd))

                minimumscore (msd)= creatematrixdata (ksd,msd);

         end

     end

end

% display the result of minimum score

minimumscore

%% h)For each exam sort the score in descending

% order from low to high with contain the indices

% of the matrix

[B,I] = sort(creatematrixdata,'descend')

%% i) obtain the following output using Reshape

reshape(creatematrixdata,[2,8])