my question is what is wrong with my code, the results should be in the first picture not the second.

D=zeros(6);

for row=1:6

for col=1:6

if col>row %upper right corner

D(row,col)=0

else if col==row %diagonal

D(row,col)=0

else if row>col % bottom left corner

if mod(row,2) ==0 && col==1

D(row,1)= row-1

if mod(row,2)==0 && mod(col,2) ==1 && col>=3

D(row,col)= (row-1)*2

if mod(row,2) ==1 && mod(col,2) ==0

D(row,col)= (row-1)*2

end

end

end

end

end

end

end

end

Answer 1

[David Goodmanson]

Hi jana,

the problem is that the if statements

if mod(row,2)==0 && mod(col,2) ==1   && col>=3             % (b)   
and    
if mod(row,2) ==1 && mod(col,2) ==0                        % (c)

are contained within

if mod(row,2) ==0 && col==1                                % (a)  
  .......
  .......  
end

and their conditions conflict with (a) so they never are implemented. If for both (b) and (c) you change 'if' to 'elseif' and then get rid of two suddenly extraneous end statements at the end, it works.

[jana nassereddine]

hey, I just solved an hour ago

D=zeros(50);

for row=1:51

for col=1:51

if col>row %upper right corner

D(row,col)=0

else if col==row %diagonal

D(row,col)=0

end

end

if row>col % bottom left corner

if mod(row,2) ==0 && col==1

D(row,1)= row-1

end

if mod(row,2)==0 && mod(col,2) ==1 && col>2

D(row,col)= (row-1)*2

end

if mod(row,2) ==1 && mod(col,2) ==0

D(row,col)= (row-1)*2

end

end

end

end

[David Goodmanson]

Hi jana, I forgot to mention that there is no need to do the for loops that set the upper right corner to zero, since your preallocation of D made them zero already.