money_borrowed=1000; 
interest_rate=.10;
end_loan_of_first_year=(money_borrowed*interest_rate)+money_borrowed
new_interest=end_loan_of_first_year*interest_rate 
debt=end_loan_of_first_year+new_interest 

Week-3

A Simple Function 

Corner Case

Taxi Fare 

Week-5

Assignment: Built-in functions

Minimum and Maximum 

Write a function called minimax that takes M, a matrix input argument and returns mmr, a row vector containing the absolute values of the difference between the minimum valued elements in each row. As a second output argument called mmm, it provides the difference between the maximum and minimum element in the the code below for an example: 

Assignment: Lesson 4 Wrap-up

 Matrix Construction

Practice if-statements

Assignment: for-loop practice

Practice for-loops 

Assignment: while-loop practice

Practice while-loops

Assignment: Logical Indexing

Logical Arrays Practice

Assignment: Lesson 6 Wrap-up

Lesson 6 Wrap-up

Week-8

 

Assignment: Character Vectors

Simple Encryption

 

Ans:-

 

function txt = caesar(txt,key) 

    txt = double(txt) + key; 

    first = double(' '); 

    last = double('~'); 

    % use mod to shift the characters - notice the + 1 

    % this is a common error and results in shifts 

    % being off by 1 

    txt = char(mod(txt - first,last - first + 1) + first); 

end

 

 

Assignment: Using Cell Arrays

Sparse Matrix

 

Ans:-

 

function matrix=sparse2matrix(cellvec) 

matrix=cellvec{1,2}*ones(cellvec{1,1}); 

[m n]=size(cellvec); 

for i=3:n 

    A=cellvec{1,i}; 

    p=A(1); 

    q=A(2); 

    matrix(p,q)=A(3); 

end 

end

 

 

Week-9

Assignment: Excel Files

Excel File I/O

 

Ans:-

 function distance = get_distance(city1, city2) 

[~,~,raw] = xlsread('Distances.xlsx'); 

index_list_1 = strcmp(city1,raw(:,1)); 

index_list_2 = strcmp(city2,raw(1,:)); 

if all(index_list_1 == 0) || all(index_list_2 == 0) 

   distance = -1; else 

   distance = raw{(index_list_1 == 1), (index_list_2 == 1)}; 

end

 

Assignment: Text Files

Text File I/O

Ans:-

 

function charnum = char_counter(fname,character) 

 fid = fopen(fname,'rt'); 

 if (fid<0) || ~ischar(character) 

 charnum = -1; 

 else

 oneline = fgets(fid);

 charnum = 0; 

 while (ischar(oneline)) || (strcmp(character,oneline)==1) 

 f = strfind(oneline,character); 

 charnum = charnum + length(f);

 oneline = fgets(fid); 

   end 

 end 

end 

Final Problems Week-9

Assignment: Saddle Points

Saddle Points

Write a function called saddle that finds saddle points in the input matrix M. For the purposes of this problem or equal to every element in its row, and less than or equal to every element in its column. Note that there m that has exactly two columns. Each row of indices corresponds to one saddle point with the first element of t element containing the column index. If there is no saddle point in M, then indices is the empty array.

 

Ans:-

 

function indices=saddle(M) 

indices=[]; 

[a b]=size(M); 

q=1; 

for i=1:a 

 for j=1:b 

 x=M(i,:); 

 y=M(:,j); 

 c=M(i,j)>=x; 

 d=M(i,j)<=y; 

 if ~ismember(0,c) && ~ismember(0,d) 

 indices(q,1)=i; 

 indices(q,2)=j; 

 q=q+1; 

 end 

 end 

end 

end  

 

Assignment: Image Blur

Image blur

Ans:-

 

function output = blur(img,w) 

B=double(img); 

[m,n] = size(B); 

k=2*w+1; 

for i = 1:m 

 for j = 1:n 

 p=i-fix(k/2); 

 q=i+fix(k/2); 

 r=j-fix(k/2); 

 s=j+fix(k/2);

 if p<1 

 p=1; 

 end 

 if q>m 

 q=m; 

 end 

 if r<1 

    r=1; 

 end 

 if s>n 

 s=n; 

 end 

 A=B([p:q],[r:s]); 

 C(i,j)=mean(A(:)); 

 end 

end 

output=uint8(C); 

end  

 

 

Assignment: Echo Generator

Echo Generator

 

Ans:-

 

function output = echo_gen(in,fs,delay,gain) 

samples = round(fs*delay) ; 

ds = floor(samples); 

signal = zeros(length(in)+ds,1); 

signal(1:length(in))=in; 

echo_signal =zeros(length(in)+ds,1); 

echo_signal(ds+(1:length(in*gain)))=in*gain; 

output= signal + echo_signal; 

p= max(abs(output)); 

if p>1 

output=output ./ p; 

else 

output = output; 

end 

end