Problem 1451. Symmetry of vector

function y = symmetry(x)
  n=length(x);
   for i=1:n
       if x(i)==x(n-i+1)
           y=1;
       else
           y=0;
       end
   end
end

Problem 1430. Create an n-by-n null matrix and fill with ones certain positions

unction a = FillWithOnes(n,mat)
m=size(mat,1);
a = zeros(n);
for i=1:m
    b=mat(i,:);
    c=b(1,1);
    d=b(1,2);
    a(c,d)=1;
end
end

Problem 33. Create times-tables

function m = timestables(x)
for i=1:x
m(i,:)=i:i:i*x;
end
end

Problem 645. Getting the indices from a vector

function out = findIndices(vec, thresh)
out =find(vec>thresh);
end

Problem 10. Determine whether a vector is monotonically increasing

function tf = mono_increase(x)
if isempty(find(diff(x)<=0))
   tf = true;
else
   tf = false; 
end

Problem 838. Check if number exists in vector

function y = existsInVector(a,b)
if any(find(b(:)==a))==1
    y=1;
else
    y=0;
end

Problem 19. Swap the first and last columns

function B = swap_ends(A)
m=size(A,1);
n=size(A,2);
B=zeros(m,n);
for i=1:n     
     if i==1  
            B(:,i)=A(:,end);
     elseif i==n
            B(:,end)=A(:,1);
     else
            B(:,i)=A(:,i);
     end
end
end

Problem 262. Swap the input arguments

function [q,r] = swapInputs(a,b)
  [q,r] = deal(b,a);
end

Problem 7. Column Removal

function B = column_removal(A,n)
  A(:,[n]) = [];
  B=A;
end

Problem 2015. Length of the hypotenuse

function c = hypotenuse(a,b)
  c = sqrt(a^2+b^2);
end